Car shakes after motor swap. Rotted suspension?
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Car shakes after motor swap. Rotted suspension?
Today was the first day I drove on decent tires. My front tire had a lump in the sidewall so I thought that's what made it shake. Well I took it off and after enough speed ( idk how fast I'm going speedometer broke) but around 50 ish it starts to shake. I don't know if it continues if I go faster because I slow down. Before the old lo5 rode smooth up to 80 but the lt1 is lighter so maybe that has something to do with it? I never rode in a thirdgen with a good suspension so I don't know what to expect ( maybe that will change at the thirdgen fest
) but I feel every bump and hear every rattle.
So what I'm asking is what do I need to replace so the shaking stops?
What do I need to replace so the rattles and bumps are kept to a minimum (stock height is fine)?
As far as I know everything is stock and 25 years old. So instead of everything at once and just throwing parts at it could someone help?
) but I feel every bump and hear every rattle.So what I'm asking is what do I need to replace so the shaking stops?
What do I need to replace so the rattles and bumps are kept to a minimum (stock height is fine)?
As far as I know everything is stock and 25 years old. So instead of everything at once and just throwing parts at it could someone help?
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From: Saskatchewan, canada
Car: 1982 Firebird T/A
Engine: 305
Re: Car shakes after motor swap. Rotted suspension?
check tires for separation etc. Check to see how much play is in your wheel bearings. if its more than 5 thou then repack and reset your bearings, or get new or whatever. If your wheel bearings are in good condition take your tires to a good mechanic (not a tire shop with 20 yr old kids working there) and get your tires balanced. after they balance the tires check for weight placement on the rims, make sure they did a good job and didn't slap weights everywhere. Also make sure they wash the rims before balancing. If the car STILL shakes I would jack it up high and check your front end, pry on joints like where the control arm meets the crossmember or any sort of bushing placements. you should be able to figure it out
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
check tires for separation etc. Check to see how much play is in your wheel bearings. if its more than 5 thou then repack and reset your bearings, or get new or whatever. If your wheel bearings are in good condition take your tires to a good mechanic (not a tire shop with 20 yr old kids working there) and get your tires balanced. after they balance the tires check for weight placement on the rims, make sure they did a good job and didn't slap weights everywhere. Also make sure they wash the rims before balancing. If the car STILL shakes I would jack it up high and check your front end, pry on joints like where the control arm meets the crossmember or any sort of bushing placements. you should be able to figure it out
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From: Saskatchewan, canada
Car: 1982 Firebird T/A
Engine: 305
Re: Car shakes after motor swap. Rotted suspension?
alignment will do lots of pulling while at higher speeds, or it will feel as if the car is fighting which direction to drive in, check tires for cupping and irregular wear, that is a classic sign of poor alignment/bad bearings. I wouldn't think strong vibration wouldn't be alignment. another thing... is the vibration in the steering? or does it feel more drivetrain?
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From: Rocky Ford, Colorado
Car: 91 Pontiac Firebird Formula
Engine: 305 TBI
Re: Car shakes after motor swap. Rotted suspension?
I too am having this issue of vibration. I have recently replaced wheel barrings, tye rods and tye rod ends. I have had a good alignment. My Bella drives nice, she drives about 80 on our Interstate straight on a line.
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From: Rocky Ford, Colorado
Car: 91 Pontiac Firebird Formula
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Re: Car shakes after motor swap. Rotted suspension?
I should have added I also have new rubber. The vibration doesnt feel like its in the steering.
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
alignment will do lots of pulling while at higher speeds, or it will feel as if the car is fighting which direction to drive in, check tires for cupping and irregular wear, that is a classic sign of poor alignment/bad bearings. I wouldn't think strong vibration wouldn't be alignment. another thing... is the vibration in the steering? or does it feel more drivetrain?
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From: Saskatchewan, canada
Car: 1982 Firebird T/A
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Car: 85 Z28 T-Top 36mm sway & wonderbar
Engine: TPI L98 350 W/85 Vette Stage II ECM
Transmission: W/C T-5, alum drive shaft
Axle/Gears: 9 bolt posi, 3:27, PBR's, BB LS1's
Re: Car shakes after motor swap. Rotted suspension?
I had a bent axle flange and didn't know it for a long time. I did a runout with a dial gauge.
Thread Starter
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Joined: Jan 2009
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Thread Starter
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Joined: Jan 2009
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
There's a shop here that does front alignments for $30 last time I checked. Could this fix most of my problems?
I just learned engines now I gotta learn everything else lol
I just learned engines now I gotta learn everything else lol
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From: Saskatchewan, canada
Car: 1982 Firebird T/A
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Re: Car shakes after motor swap. Rotted suspension?
when you pick up speed the unbalanced tires shake, which shakes your steering components, which shakes your steering wheel,dash, front end etc. this is most common.
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
Your alignment wont fix the problem, that only makes your car drive strait. Any shop that installs tires will have a tire balancing machine. They put the whole tire with rim on the machine and it spins it, it then decides where it needs weights so the tire doesn't shake at high speeds. so its balanced. should be around 30 bucks probably. in Canada its around 40
when you pick up speed the unbalanced tires shake, which shakes your steering components, which shakes your steering wheel,dash, front end etc. this is most common.
when you pick up speed the unbalanced tires shake, which shakes your steering components, which shakes your steering wheel,dash, front end etc. this is most common.
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From: Houston MS
Car: 87 GTA Trans Am
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From: Huntsville, AL
Car: 89 Black IROC-Z convertible
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Re: Car shakes after motor swap. Rotted suspension?
I'd go back to the shop that sold them to you and tell them they need to be balanced. They should be willing to re-do them.
Otherwise go to a new tire store and pay to have them done. It shouldn't cost that much.
Otherwise go to a new tire store and pay to have them done. It shouldn't cost that much.
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Re: Car shakes after motor swap. Rotted suspension?
Did your trans pinion angle change with the swap?
Different motor or trans mounts?
Different motor or trans mounts?
Thread Starter
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
Thread Starter
Senior Member
Joined: Jan 2009
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
A badly balanced tire could have weights stacked on top of weights - i've seen that before because the tire balancer machine wasn't calibrated correctly and the weights were way way way off although the tires eventually balanced zero on the screen. You should not have greater than 2 ounces of weights on any wheel. A single stick on weight will be 1/4 ounce - but sometimes they come in strips and its hard to tell.
Thread Starter
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Joined: Jan 2009
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
You might be talking about the sticky weights that are attached to the inside rim surface vs. 'pound on' weights that are attached to the outside lips of the wheel. If a tire has been re-balanced you should be able to tell where the old weights were scraped off and the new weights added (where the wheel will have been cleaned so that the weights stick). It might also be possible that the old weights were left on and new weights added - so that you will see new weights in addition to the presence of old weights (a clear sign that a lazy tire guy mounted the tires).
A badly balanced tire could have weights stacked on top of weights - i've seen that before because the tire balancer machine wasn't calibrated correctly and the weights were way way way off although the tires eventually balanced zero on the screen. You should not have greater than 2 ounces of weights on any wheel. A single stick on weight will be 1/4 ounce - but sometimes they come in strips and its hard to tell.
A badly balanced tire could have weights stacked on top of weights - i've seen that before because the tire balancer machine wasn't calibrated correctly and the weights were way way way off although the tires eventually balanced zero on the screen. You should not have greater than 2 ounces of weights on any wheel. A single stick on weight will be 1/4 ounce - but sometimes they come in strips and its hard to tell.
Ok. Then they need to be balanced.
I will after I can find this tranny leak
Thread Starter
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
Now that I know what's shaking my car. Would autozone oem replacement springs give me a better ride and help with the bumps??
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From: British columbia, Canada
Car: 1986 Firebird
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Re: Car shakes after motor swap. Rotted suspension?
ask if a shop will check the balance on your tires. that might be free, or they might charge you a pittance for their time. never know.
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
I called all over and Midas decided to look at it. They put it in the air. Said they wouldn't touch it because the front spacers are too tight on one side of the wheel and 1/16th of an inch gap on the other. Then they pointed out I have a bad drivers wheel bearing and the passAnger is worst. They need repacked? And the passAnger tire isnt smooth. But we stopped looking for more because my transmission was leaking from accumulator or pan
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From: Huntsville, AL
Car: 89 Black IROC-Z convertible
Engine: 305 TBI
Transmission: Auto
Re: Car shakes after motor swap. Rotted suspension?
If the wheel bearings are bad, they need more than to be re-packed. They need to be replaced. Replacing them isn't that difficult or expensive. Make sure that you change the race and put in a new seal. You should be able to find a thread on this site to help you out on that.
The spacers need to be looked at and I'm not sure what you mean by a "smooth" passenger tire but it sounds like it should be replaced.
And after you fix your trans leak, you should be good to go. Good Luck!
The spacers need to be looked at and I'm not sure what you mean by a "smooth" passenger tire but it sounds like it should be replaced.
And after you fix your trans leak, you should be good to go. Good Luck!
Thread Starter
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
If the wheel bearings are bad, they need more than to be re-packed. They need to be replaced. Replacing them isn't that difficult or expensive. Make sure that you change the race and put in a new seal. You should be able to find a thread on this site to help you out on that.
The spacers need to be looked at and I'm not sure what you mean by a "smooth" passenger tire but it sounds like it should be replaced.
And after you fix your trans leak, you should be good to go. Good Luck!
The spacers need to be looked at and I'm not sure what you mean by a "smooth" passenger tire but it sounds like it should be replaced.
And after you fix your trans leak, you should be good to go. Good Luck!
The spacers I'm hoping they torqued one side is torqued too tight and put on wrong. Yea the passAnger tire needs replaced.
Thread Starter
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Joined: Jan 2009
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
So since I'm replacing the bearings what bushings/bearings are down there? Everything is original
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Posts: 507
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
Ttt payday is Friday and I want to buy parts I need only. Trying to make it safely to the my first thirdgen fest this year. Gotta get it running smooth
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Car: 89 Black IROC-Z convertible
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Re: Car shakes after motor swap. Rotted suspension?
you should plan on becoming familiar with your local parts stores and clerks. This should point you in the right direction.
http://www.oreillyauto.com/site/c/se...aro&vi=1035650
Thread Starter
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Joined: Jan 2009
Posts: 507
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
You can do a search on here for bearing numbers or its as simple as going to your local parts store. I'm, pretty sure that there are threads on here or mybe even youtube, showing/telling you how to change and set them. You need 2 inners, 2 outers, races, seals, and grease. Make sure that the grease is the right stuff and that it is clean or this will be a practice run for the next time you need to change them.
you should plan on becoming familiar with your local parts stores and clerks. This should point you in the right direction.
http://www.oreillyauto.com/site/c/se...aro&vi=1035650
you should plan on becoming familiar with your local parts stores and clerks. This should point you in the right direction.
http://www.oreillyauto.com/site/c/se...aro&vi=1035650
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From: Macon, GA
Car: 1992 Camaro RS
Engine: Vortec headed 355, xe262
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Re: Car shakes after motor swap. Rotted suspension?
Consider getting new brake rotors... would save you the trouble of pounding the bearing races out of your old rotors. Not a big deal if you have a good punch but it can be a bit of a pain in the butt.
Thread Starter
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Joined: Jan 2009
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Thread Starter
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Joined: Jan 2009
Posts: 507
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
Fixed the bushings and I still have a Death shake. I believe it's my passAnger side tie rod end. I can't over 45 without feeling like I'm going to die.
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From: NWOhioToledoArea
Car: 86-FireBird
Engine: -MPFI
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Re: Car shakes after motor swap. Rotted suspension?
have all 4 tires balanced, if something is off with them, it will show.
https://www.thirdgen.org/forums/susp...cup-water.html
https://www.thirdgen.org/forums/susp...cup-water.html
Thread Starter
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Joined: Jan 2009
Posts: 507
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
have all 4 tires balanced, if something is off with them, it will show.
https://www.thirdgen.org/forums/susp...cup-water.html
https://www.thirdgen.org/forums/susp...cup-water.html
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From: Huntsville, AL
Car: 89 Black IROC-Z convertible
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Transmission: Auto
Re: Car shakes after motor swap. Rotted suspension?
You need to go have the tire balances checked, or you will end up with front end component problems
Thread Starter
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
Tire barn, and Midas were the only ones that would even consider looking at my car, because of the aftermarket wheels and 2 front spacers. I would basically have to take the wheels off myself and take them up there. Which is hard because I work the same schedules they're open. Plus they kept saying they look balanced so they wouldn't touch em.
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From: NWOhioToledoArea
Car: 86-FireBird
Engine: -MPFI
Transmission: T5
Axle/Gears: 3:42
Re: Car shakes after motor swap. Rotted suspension?
Don't take the whole car, just take the tires in for a balance. on top of its will take 3hrs if you take the whole car.
just carry in the tires and its a 20min job.
just carry in the tires and its a 20min job.
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
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Joined: Oct 2001
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From: NWOhioToledoArea
Car: 86-FireBird
Engine: -MPFI
Transmission: T5
Axle/Gears: 3:42
Re: Car shakes after motor swap. Rotted suspension?
jack stands and jack, in the parking lot next door [ not theirs, illegal] remove your tires and carry them in.
Thread Starter
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Joined: Jan 2009
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
Well I replaced the tire and MOST of the shaking stopped. Now it shakes the faster I go. So now they may just need balanced. He only mounts where I just came from.
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
have all 4 tires balanced, if something is off with them, it will show.
https://www.thirdgen.org/forums/susp...cup-water.html
https://www.thirdgen.org/forums/susp...cup-water.html
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From: Huntsville, AL
Car: 89 Black IROC-Z convertible
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Transmission: Auto
Re: Car shakes after motor swap. Rotted suspension?
I'm not sure what that means 
Its obvious that your problem is unbalanced or improperly balanced tires and you are the only one that can remedy the problem, You'll either have to park the car until you can get them balanced properly or replaced, Change your schedule to accomodate having them done, or take some of the suggestions on resolving the problem that you have been given here. I'm also not sure what you mean when you say that they tell you that the tires "look" balanced. They will have to put them on a balancing machine to get them balanced. Good luck with your problem.

Its obvious that your problem is unbalanced or improperly balanced tires and you are the only one that can remedy the problem, You'll either have to park the car until you can get them balanced properly or replaced, Change your schedule to accomodate having them done, or take some of the suggestions on resolving the problem that you have been given here. I'm also not sure what you mean when you say that they tell you that the tires "look" balanced. They will have to put them on a balancing machine to get them balanced. Good luck with your problem.
Thread Starter
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Joined: Jan 2009
Posts: 507
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From: Indianapolis, in
Car: 1987 Sports coupe/z28
Engine: 2.8/ swapping 5.3
Transmission: 700r4
Axle/Gears: Open 3.42
Re: Car shakes after motor swap. Rotted suspension?
I'm not sure what that means 
Its obvious that your problem is unbalanced or improperly balanced tires and you are the only one that can remedy the problem, You'll either have to park the car until you can get them balanced properly or replaced, Change your schedule to accomodate having them done, or take some of the suggestions on resolving the problem that you have been given here. I'm also not sure what you mean when you say that they tell you that the tires "look" balanced. They will have to put them on a balancing machine to get them balanced. Good luck with your problem.

Its obvious that your problem is unbalanced or improperly balanced tires and you are the only one that can remedy the problem, You'll either have to park the car until you can get them balanced properly or replaced, Change your schedule to accomodate having them done, or take some of the suggestions on resolving the problem that you have been given here. I'm also not sure what you mean when you say that they tell you that the tires "look" balanced. They will have to put them on a balancing machine to get them balanced. Good luck with your problem.
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