Vibration in car

I got a 1971 Buick Skylark and my ends on the cross-member where the Rubber is rusted off so i got a welder to weld some new ends on it and done away with the rubber and know i have picked up a Vibration when the car goes in to 2nd gear also i race the car and it is basicly stock. When you do away with the rubber on the ends of the cross-memer and bolt it in do you have to space the height up any to make up the different in the rubber the only thing else i have done to the car other then the cross-member is put a set of Hoosier Slicks on the car. Thanks for you time

 

The angle of the front driveshaft yoke to the driveshaft should be the same angle as the driveshaft to the rearend pinion to cancle each other out. If not a vibration will occur.
Ray

 

How would you check that.

 

Check with one of these http://store.summitracing.com/partdetail.asp?autofilter=1&part=CEE-5020&N=-111371+115&autoview=sku. Other causes of vibration could be worn u-joints, trans bushing or the driveshaft yoke not inserted far enough into the output shaft of the trans.
Ray

 

When I had the 455/400 combo in my 84 Cutlass, we had to cut a crossmember and basically bolted it to the frame. I also had a vibration, only at certain RPM's. Went away when I put rubber inbetween the member and frame. Wether that was because of the Angle change or Isolating the crossmember, I don't know.



I'd try putting 1/4in spacers in to see if it helps. Or redo your mounts if it doesn't... put the rubber back in, after all... It took 30yrs for the last crossmember to rust out. Shouldn't have to do it again for a long time.

 

The spacer where the rubber bushings went is a must....you are changing the pinion angle by lowering the tranny mounts..this could cause driveshaft imbalance because of the pinion angle and the trans yolk....if it was never there before..than the shims should take it away. You dont want a deiveshaft coming from together at over 80mph..it's not pretty. :ball:

 

Cross Member

So what you are saying i need to cut me a piece of rubber a 1/4 inch thick and put between the cross-member and the frame.

 

Some one in the past said the opg https://www.opgi.com/GateOlds4.asp has the crossmember insulators listed in the Olds section. There under Transmissoin and Clutch Components.
Ray