vibration problem!
#1
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Location: indiana
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Car: 1991 formula/83z28
Engine: 350/ 350
Transmission: wc t5/ non wc t5
Axle/Gears: 3.42/3.73
vibration problem!
My 83 z28 has a t5 and vibrates badly above 60mph at all times. It's at its worst in neutral. It is slightly better under a hard load but still bad. I can feel it in the shifter not in the wheel. I need some help.
#3
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Car: 89 iroc
Engine: 5.7 trick flow heads t-ram
Transmission: wct5
Axle/Gears: 3.42
Re: vibration problem!
Maybe check the driveshaft for dents or pull the driveshaft and check the yoke to see if there is any wear on the splines. It could also be the pilot bearing/bushing wore out. If it has a pilot bushing and not a bearing, it is sometimes hard to "eyeball"if it's bad because a lot of times the bushing will wear evenly. Also, if the pilot bearing/bushing is too far in the crank, it won't support the input shaft properly, creating a vibration and eventually causing transmission damage. Just some things to look at. Good Luck.
#5
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Re: vibration problem!
Do you have a polyurethane transmission mount? I have a T5 and had a very bad vibration and had my driveshaft balanced twice. Vibration didn't go away. I bought a Spohn Top Gun driveshaft and vibration was still there. I swapped the polyurethane trans mount for a factory one and vibration disappeared. Apparently the poly mount was transferring the vibrations from the T5 to the body of the car.
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Car: 1988 IROC-Z camaro
Engine: 355 TPI
Transmission: tko 500
Axle/Gears: Dana 44 3.31 posi pbr brakes
Re: vibration problem!
^same as above poster. I had an energy suspension poly mount and had a terrible vibration. Replaced it with a stocker and vibration went away. I've really heard nothing good about them and vibration.
#7
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Re: vibration problem!
[QUOTE=91formula5speed;5193863..... It's at its worst in neutral.QUOTE]
Here's the solution to my vibration problem. Your comment about the vibration being worse in neutral eliminates the driveshaft and tire balancing issues (unless you meant neutral at 60 mph).
https://www.thirdgen.org/forums/tran...vibration.html
Here's the solution to my vibration problem. Your comment about the vibration being worse in neutral eliminates the driveshaft and tire balancing issues (unless you meant neutral at 60 mph).
https://www.thirdgen.org/forums/tran...vibration.html
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#8
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Location: indiana
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Car: 1991 formula/83z28
Engine: 350/ 350
Transmission: wc t5/ non wc t5
Axle/Gears: 3.42/3.73
Re: vibration problem!
yes I mean neutral at highway speed. The faster you go the worse it gets.
#9
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Car: 1991 formula/83z28
Engine: 350/ 350
Transmission: wc t5/ non wc t5
Axle/Gears: 3.42/3.73
Re: vibration problem!
I changed the mount and it got better. But still there it almost seems as if it only does it in 5th gear. if ibrun 60 in fourth I don't feel it.
#11
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Car: 1991 formula/83z28
Engine: 350/ 350
Transmission: wc t5/ non wc t5
Axle/Gears: 3.42/3.73
Re: vibration problem!
Very disappointing just got it and its a nice car. It had a poly mount but even with the factory it vibrates.
#12
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Re: vibration problem!
Did you swap driveshafts yet?
#13
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Re: vibration problem!
can you let me know the tracking number on the ecm and memcal I bought from you on the 8th? It should not take this long to come from indiana to colorado ?
https://www.thirdgen.org/forums/engi...-complete.html
https://www.thirdgen.org/forums/engi...-complete.html
#15
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Car: 1991 formula/83z28
Engine: 350/ 350
Transmission: wc t5/ non wc t5
Axle/Gears: 3.42/3.73
#17
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Re: vibration problem!
I just swapped a T56 into my 87 Trans Am, and i'm getting a bad vibration as well. I've got a factory style rubber trans mount. Only thing is, the vibration is even present at idle. Idk if the flywheel is out of balance or what? The guy I got the trans from said that the flywheel had been resurfaced, and it had some drill marks on the back, like they balanced it, or at least tried to. I'm stumped.
#18
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Car: 1991 formula/83z28
Engine: 350/ 350
Transmission: wc t5/ non wc t5
Axle/Gears: 3.42/3.73
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