8 3/4 pad placement

Ol'forest said

Have to forgive my ignorance here, but what does this locating bar look like, I've never seen anything used when someone welds on a rear.

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Just a long absolutely straight piece of round rod 1-1/4" diameter with locating pucks for the housing ends and center section. I bought the pucks from Leadmine products on E-bay. Here's a link
Rearend Narrowing Fixture Combo with Rearend Ruler - 8 3/4" Mopar Rear End - | eBay

and the straight bar from Speedy metals. Here's a link
Speedy Metals 1-1/4" 1045 Steel Round