Narrowing an 8 1/4"

IMO don't bother with the expense of attempting to shorten an 8.25 or 9.25

You should be able to find an Abody 8.25 cheaper than the expense of shortening one or even find an early Bbody 8.75 rear or an F, M or J body 8.25. Can find a Cbody 8.75 and have it shortened as well.

additional note: 8.25 and 9.25's are 'C' clip axles which would likely increase the cost of shortening the axles. Someone stated the axle spline count on the 8.25 was odd... it is 27 up to 96, 97 and up is 29 spline. And yes both axles are the same length A, B, R, C, D, E, F, M & J bodies to the best of my knowledge