Quote:
Originally Posted by Blued and Painted
Sounds like not your average vibration so I'll throw some things against the wall and see if anything sticks.
Hub centric wheel balance on a lug centric or uni-lug wheel. Lug centric balancing adapters are available.
Drive shaft to long. With the weight on the wheels, you should have enough clearance to flip the rear joint out of the pinion yoke.
Some have observed the factory drive shafts may look like a jump rope going down the road. Check installed run-out at front, rear, and middle.
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Good info, thx. These are the replacement steel rally 1 wheels, so all lug centric, at least they have the self-centering lug holes, so I THINK they are lug centric. On edit... I just thought of something. While mounting wheels yesterday I was looking at the chrome aftermarket lugs, and while the wheel appears to be centered after installing a couple of lugs, it almost looks like the shoulder of the lug (the non-tapered part) comes in contact with the rim earlier than it should. Theses are the lugs that come with the replacement wheel kits from the Pontiac suppliers. A long shot, but worth a look.
Driveshaft length looks good. Took it out yesterday by the method you mentioned.
I need to take a closer look at potential run-out on the driveshaft. The shaft seems pretty robust, so I do not think it is factory. I have a chassis dyno session setup for Wednesday, so might be a good chance to have someone look at the shaft. The dyno shop specializes in performance & muscle cars, so may have one of their guys take a ride with me for another opinion.