Time for a new Driveshaft? How can you tell?

[jstang209]

Ive had a horrible vibration for some time now, its was very vigorus in the shifter area but i retorqued my shifter bolts down and it helped a little, but the vibration is still there and its so bad its wiggle my starter bolts out every couple of trips!! it starts to occure when i reach 40+mph and stops it i let off the gas sometimes but when i let off the gas and im in neutral rolling on an offramp of something it was vibrate like crazy(i mean horrible crazy) until i reach a certain speed. I have a new balancer on the engine, new flywheel, what else is next?! thanks

 

[speedytang]

Driveshaft and or a out of balance Pressure Plate and Disc.

 

[jrichker]

Time for a new Driveshaft? How can you tell

There will be a vibrating feeling in your wallet...

Check the alignment of the yellow paint mark on the driveshaft with the paint mark on the rear axle flange.

Having a machine shop balance your stock drive shaft is $35-$55 depending on the labor rate in your area.

Cheapo test method: Put two worm gear radiator clamps on the driveshaft next to each other. Start with the screw 180 degrees apart. Drive it, if it vibrates, move one clamp so that it is 200 degrees apart, drive again and note the change, if any. Move the one clamp some more and repeat the process. If you get the clamps to the point where both the screws are side by side, and it still vibrates the same, the driveshaft balance probably isn't the problem.