Extremely Bad Vibration...Please Help ASAP

[allenpark94gt]

I put in a rebuilt tranny last wk...the car has been driving fine since then...but today I took it out on the highway and at about 45-50 mph the car starts vibrating extremely bad...checked the driveshaft and all the weights were still on and driveshaft was put back on correctly....also the vibration was so bad that it snapped one of the bellhousing to motor bolts...My harmonic balancer looks fine...and I cant figure out what else the problem could be...anyone?

 

[allenpark94gt]

anyone?

 

[mytight95]

i have one that is severe about the same MPH you describe, see my thread, But mine happened upon having new u-joints installed into the driveshaft.......


jason

 

[WHITE94COBRA]

did you get a new clutch?? if you did, did you get the right one, improperly installed, bad throw out, etc.

 

[94-302-vert]

What if you leave the trans in neutral and rev the engine, any vibration? if so then run this test again with the clutch depressed... What about if you are going the 50 mph to get the vibration and you push in the clutch and let the rpm's fall... does this happen in all gears???

This can help to rule in or out things...

Chris

 

[95strokerPSU]

What if you leave the trans in neutral and rev the engine, any vibration? if so then run this test again with the clutch depressed... What about if you are going the 50 mph to get the vibration and you push in the clutch and let the rpm's fall... does this happen in all gears???

This can help to rule in or out things...

Chris

What would it mean if you're cruising in 5th till you get to the speed that vibration occurs and then depress the clutch and it makes the vibration worse?

Sorry to jack the thread.

 

[revhead347]

Sounds like a bad U-joint. Take the driveshaft out, and check them.

Kurt

 

[allenpark94gt]

took the driveshaft and got the u-joints replaced, and the shaft balanced...problem solved

 

[CManT1914]

took the driveshaft and got the u-joints replaced, and the shaft balanced...problem solved

Good to hear. I had a bad vibration between 60-70, and I thought it was the u-joints (as this seems to be a common problem), but it ended up being my passenger side dump was rubbing the driveshaft. The solution? New exhaust, lol.

 

[mytight95]

good to hear


jason

 

[94-302-vert]

How much are you guys paying for new u-joints and balancing???

I took out my dogbone yesterday and it is better but these 90mph and 100 mph things are making me paranoid...

Chris

 

[allenpark94gt]

I paid $118 all together for new u-joints installed, new transmission yoke, and balancing from a local driveshaft shop in my area. Not sure how much it would be where you are but from what I hear if you can find a shop that specializes in driveshaft balancing/fabricating it will be a lot cheaper then if you were to go to belle tire or something along those lines.

 

[94-302-vert]

OUCH, that is half the $$ for a FMS aluminum D/S that includes all of that...

DOH.

Chris