the car will wobble a little bit at about 10 mph, and then after that you don't notice it after that, How do I check it? Could it be the tire?Thanks the rear is a 9 bolt.

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86Z28, GM 350, Jet perf Q-jet & chip Dual snorkel air cleaner, Edelbrock performer intake, Edelbrock headers, Edelbrock cat-back, Off road pipe, MSD 6AL, Accel Super Coil, Taylor Spiro-pro wires, Rapid fire plugs, Jet fan switch, World class t-5, Hurst Short Throw Shifter, Ram Flywheel, Center force dual friction clutch,Aluminum drive shaft, BW disc rear 3.45's & a posi, PBR calipers, Earls braided brake lines, Polygrapite bushings all the way around, poly tranny mount & torque arm mount, Hotchkis lower control arms & panhard rod, Rancho limiter straps, KYB struts & shocks, Gm Wonderbar, Edelbrock strut tower brace, SSM sub frame connectors, Jamex lowering springs, Carbon metallic brake pads, Crossed drilled rotors, Mobil 1 Tranny fluid & motor oil, GM syntheic rear end oil, K&N, Grant stering wheel, 1,200 watt system, Jet Black Paint, 91 Z28 rims, 92 wing, Tinted windows.

 

Put it up on a pair of jackstands and put in gear and watch the wheels as they spin...

KAM

 

Could it be your tie-rods?

 

I had something similar happen to my car. The car would wobble at low speeds, but wobbled so quick @ high speeds, that it was unnoticable. I freaked out 'cuz I though something major was out of kilter.
I realized that I had broke a belt on a tire (excessive burnouts may be hazardous to your tire's health ), and that one rear tire was causing the whole car to shimmy.

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No guts, no glory.

 

But if the rear tire is wobbleing, how do i know if it is the rim or the axle? How can I check just the axle? I am almost 100% sure it is coming from the back.

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86Z28, GM 350, Jet perf Q-jet & chip Dual snorkel air cleaner, Edelbrock performer intake, Edelbrock headers, Edelbrock cat-back, Off road pipe, MSD 6AL, Accel Super Coil, Taylor Spiro-pro wires, Rapid fire plugs, Jet fan switch, World class t-5, Hurst Short Throw Shifter, Ram Flywheel, Center force dual friction clutch,Aluminum drive shaft, BW disc rear 3.45's & a posi, PBR calipers, Earls braided brake lines, Polygrapite bushings all the way around, poly tranny mount & torque arm mount, Hotchkis lower control arms & panhard rod, Rancho limiter straps, KYB struts & shocks, Gm Wonderbar, Edelbrock strut tower brace, SSM sub frame connectors, Jamex lowering springs, Carbon metallic brake pads, Crossed drilled rotors, Mobil 1 Tranny fluid & motor oil, GM syntheic rear end oil, K&N, Grant stering wheel, 1,200 watt system, Jet Black Paint, 91 Z28 rims, 92 wing, Tinted windows.

 

you probably have a broken steel belt in one of your tires just run your hands over the tread of each tire you will feel a hump on the tire with the busted belt if thats the problem just remember it could be on bottem so if you dont find it move the car a couple feet to expose the bottems

 

The places where they mount tires have those machines for weight. Most of the better model machines also check rim tolerances at high speed. I doubt it would cost over $20 to have them spin a tire. Im not sure on the drive shaft, but like you mentioned youd like to eliminate the variables.


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