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former title junky mod
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I have a 95 s-10, 2.2l 5spd, x-cab. It is lowered in the back with 3in blocks (NOT angled) monoleafs and air shocks. I get a loud vibration/grinding noise fromt the driveline at certain speeds. It always kicks in at right about 50mph and stays there up to 94mph. I am about to replce my U-joints if it is something that I am capable of doing myself (I think they are about to go). I know I need to get angled blocks too. Any help would be appricatied
 

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I'd try the angled blocks first. One thing at a time. There are angled shims you can use too but they cost about the same as the blocks. I have used sheet metal shims to get the right angle before buying the shims. Sometimes it takes up to a quarter inch to get the angle right. Usually will vibrate under load, uphill etc, and not so bad when cruising or letting off the gas. Might look for a dent in driveshaft too, never know.
 
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