[CC69Rat]

I am not sure what year model your truck is, but assuming it is 6 lug and you are wanting to just swap in another 3.08 6 lug, keep the same wheels etc.

Your rear housing (depending on the year) could be a different length than the one you find to replace it.

Lay under your truck, and from one side at the brake backing plate. Have a buddy/ wife hold the tape and measure over to the other side at the same place on the backing plate. The early rear axles are 55.5" long measured from one backing plate to the other. This would mean the housing is an early run, up to mid year 1970.

In the middle of 1970, with the introduction of disc brakes in 1971 GM widened the rear housings .75" on either side.

From mid year 70 up to 72 the measurement will be 57".

I just didn't want you to find a 6 lug 1970 housing for example and it be longer than the one you have now.. or vise versa.

If your truck is lowered, and/or you have a specific wheel backspacing setup.. the difference in the axle length could cause you problems after the swap.

Most 6 lug housings are 55.5" long, absolutely. But kinda be careful because there are 57" 6 lug out there. 1970, could be either.

Just my .02. Good luck in your search.