I recently installed a Aluminum drive shaft. It installed easy, and quick. But my car seems to be getting alot of unwanted vibrations from this new drive shaft....my car hummmmmmssssss alot, and shakes a bit...Anything I can do or check to see what this might be?? Any help will be greatly appreciated.

Zach

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Mods: Headers/flowmaster, K&N, 2k Stall, Custom shiftkit, 100hp Compucar N20 kit. Nitto 555R Drag Radials, MSD 6A, MSD Blaster Coil, No smog Pump and air foil.
Best e/t: 12.8@107
Best motor e/t: 13.59@102.7

 

I really need some help here guys. This is my daily driver....Please someone help!! Someone was telling me that it would do this untill the shaft get's back into it's groove...but I dont have time for a shaft to get in it's "groove" lol....whatever that was....but If anyone out there has ever switched to an aluminum shaft, lemme know....ANYONE HELP!!!!!!!!!!!!!!!

 

This may not help you but at least it'll get this to the top again.
One question, may sound stupid but, did you put new univeral joints in too?
Also don't you need different type of U-joints for aluminum driveshafts?
Sorry I couldn't help.

 

I replaced the end's on the joint...Did'nt wannt bother replacing the whole U-joint. It's a direct replacment for factory, just aluminum...thanx for the suggestion...
ANyone else?

Zach

 

It sometimes depends on the generation of the car that you put the aluminum driveshaft on. I believe that 3rd gens should have 3" or 3.5" and 4th gens a larger one. Maybe someone will explain this a lil bit better.

 

Seems we are all a bit lost in this area does'nt it? LOL....SOMEONE??? ANYONE????

 

Its obvious the driveshaft is unbalanced.

Maybe the rest of the U-joint needs replacing.

Where did you got the drive shaft? lf out of a junkyard, it could have been damaged in the accident that put it in the junkyard. if aftermarket, then you could have a poorly made driveshaft. If externally balanced, a weight could have come off. If internally, it could chipped. These are some ideas.

Me myself, l'd have replaced the rest of the U-joint. Also, l'd replace it now, since a worn u-joint will cause vibrations, and it would be one less thing to worry about.

Clayton

 

When you say "U-Joint" do you mean yoke? Becuase that's what I purchased....I have the yoke for the rear....The porton that goes into the tranny is fine....It was not a junk yard shaft, it was off a 4th gen that was running 11's...

Zach

 

just pull it and have it balanced. it wont cost more than 30$ (at most) at a shop. I have mine balanced, with new u joints front and rear and they also painted it for 58.60$.

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1989 pontiac firebird
bright red exterior(just repainted)
grey interior
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305 TBI (stock)
WS.6 formula wheels
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1985 trans am
factory bright yellow
4 wheel disks
16 inch wheels
305 TPI
power antenna and mirrors
t tops

 

Just take it to a transmission shop or what???

 

I'm having ridiculous vibs in my '91 Z too! I've replaced all u-joints and even installed a steel driveshaft and the vibs are still there. At 60 mph it starts humming and by 65 it's shacking horribly. As far as rebalancing an aluminum driveshaft, I've called everyone under the sun in the Baltimore/DC area and no one can balance an aluminum driveshaft, only steel which runs in the $40 range. It's enough to drive one to drinking!


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'91 Z28 1LE; 355, Sportsman II heads, Edelbrock TPI w/ 58mm TB, Tremec TKO 5-speed, 3.73's & much, much more

 

I already got the prob fixed....The U-joint was a hair 2 big for my rear-end, so I put the u-joint I already had in place, and it fit perfect, and the humming is GONE! Than u Guys for all ur help!

Zach