I want a 3.08 6-lug rearend

[CC69Rat]

I have owned a 70 GMC, 6 lug wide axle. I'm not sure if maybe the variable is GMC / Chevrolet? But I just thought it would be worth mentioning.

The early axles are 30.5" long, measured from the end of the splines to the mounting / surface where the wheel mounts. Correct for the 55.5" wide housings.

The later, 57" housing takes a 31 5/16" wide axle.

But yeah, the 70 6 lug axles can cause issues with wheel backspacing. Ask me how I know.. lol.

The plate to plate method is just an easy way to check to be exactly sure which one you need either for a straight housing swap or, to convert to 5 lug. I double check them to be sure they haven't been swapped at some point in their lives, we just never know I guess.

Hope this helps.