Differential Issue/Question

brendan127 · Jul 25, 2016

Alright guys I have a 1994 C1500, I've had a grinding in the back past few days, so I assumed it was the drum brakes. Went into them and all seems fine, adjuster needed moved a little but got that done and the noise is still there. Here's the thing it is real noticeable in 1st gear then it shifts to second and it goes away, once I hit about 35mph on up it comes back and stays back. I figure it's probably the differential bearings, is this correct?

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brendan127 · Jul 29, 2016

Had the rear end apart today, no issue except there was a leaky seal, had both seals replaced and everything put back together. My brakes are off on adjustment and the hardware is fallen off on the back left. The guy thinks it's the transmission, so I'm either having a junkyard 4l60e put on and put a few goodies in with it, or have it rebuilt at a transmission shop, or I'm also teasing the idea of a T56 swap, I found the writeup on here already.

The Arctic Fox · Aug 1, 2016

not that it'll fix the problem but change them u joints while you're at it! That solved one of my noises unknowingly.

brendan127 · Aug 9, 2016

The Arctic Fox said:
not that it'll fix the problem but change them u joints while you're at it! That solved one of my noises unknowingly.

I plan on doing those eventually. Gotta wait for now, already spent enough on the brakes, and transmission lol. Ended up getting a 4l60e with 100k out of exact same truck and motor setup. Installed corvette servo transgo shift kit and Sonnax pinless accumulator.

DerekTheGreat · Aug 9, 2016

I've heard that if you do actually have rear end noise, throw a big magnet on the diff cover to attract the metal shavings LoL. Never done it myself but heard it'll make the noise go away until you can afford to R&R it.

Differential Issue/Question

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