[Gunny]

Originally Posted by 70 GMC 4x4

Gunny,

The axle housing on the rear is just the opposite of the front. The front is almost level with a little elevation. The rear is only 6 inches from the ground. I had a 3/4 ton set up and went to 1/2 ton for a better ride. I remove some of the leafs on the rear and I think that change the arch of the spring. Which will not allow the rear axle to bolt up the springs the way they should.

Thanks for the info. I think you are correct. How bad was your vibration?

Thanks,
Tim

to even it back you can get a piece of 1/4 inch steel (a old leaf will work) cut it to match the axle purch and then grind it to a wedge shape this will make a tapered shim.

My vibration when I added 2 inches to the rear (to even out the lift to 6.5 front and back) was a real loud humming, which you could feel through the shifter (would make your hand numb), sounded like the whole rear was going to blow up.

I just made a 250 mile trip today with it (first road trip since I eliminated the vibes last week) and it did not have any vibes at 80 mph.