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Old 07-07-2018, 09:43 AM   #1
Art portet
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1972 GMC Long bed lowering problem

I lowered my 72 GMC longbed 3 inches front and back. Used blocks and 4 degree shim on rear. I am hearing a chirping sound from I believe the carrier bearing. Rear driveshaft is tight against bearing. Should I soften the shaft and if so how much?
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Old 07-10-2018, 07:04 AM   #2
PGSigns
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Re: 1972 GMC Long bed lowering problem

A 3 inch block is to much in my opinion. Blocks move the rear forward (on trailing arms) and I assume that is what you have since the shaft is binding up. You can cut it but the best way to do this would be a set of 3" springs. 4 degrees is a lot for just a three inch drop. Have you checked the u-joint angles?
Jimmy
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Old 07-10-2018, 07:09 AM   #3
Art portet
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Re: 1972 GMC Long bed lowering problem

I will look into buying springs and getting rid of the blocks. Seems like the springs will push things forward as well to some degree.
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