Narrowing 8 3/4 details

When using angle-irons you're just basicly copying the factory's (mis)alignments.
With a jig and internal bar you're actually realigning the outer bearings ends with the inner bearings in the 3rd member, like it should be done.

The angle-iron-way will work for most, but since you don't know anything about the bearingalignments, you might be prematurely wearing out the splines on the axles and bearings because of that.

Anyway, this is how I narrowed my own axle-housing...
http://www.bigblockmopar.nl/2012/01/8-34-rear-axle-narrowing/

And on the bottom of this page you can see a short text and pic how the driveshaft was shortened;
http://www.bigblockmopar.nl/2012/10/a518-overdrive-transmission-installation/

There's a little more involved in shortening a driveshaft but I don't have pics of that.