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diff
Well you have the diff correct. 1978-1987 ss montes and 1984-1987 GN and 442 came with the bigger 8.5 10 bolt...BUT you will have to also modify the drive shaft length to make that rear fit. If you are lucky to find this 8.5 nder a car...Take the drive shaft too, you will need it.
Ohter than that 7.5 10 bolt is all you get.
Probably the noise is a bearing ...carrier or pinion. see if the pinion is walking in and out the nut likes to unscrew itself if you do alot of pretty good launches.
If not then a carrier or axle bear is probably the culprit. The load will help magnify the bad bearing and or race surface. Like sand on a smooth hard floor. Jim
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