Wednesday night i swapped out my old 8.5", 3.73 powertrax drum brake rear end with a 8.5", 3.42 factory post rear end. i also added ls1 rear disc brakes at the same time. tonight i finished the project with attaching the parking brake. this is a welcome change.
Just curious, what 3.73 problem are you wanting to fix? Other than the obvious, better H/W mpg, marginally faster top end?
Only asking because my 442 is geared amazingly well with the [heavily beefed up] 4 speed overdrive and 3.73 out back.
Getting the Wilwood rear disk upgrade on mine when it gets back from being blasted and coated.
I got my new rearend home. I got a good deal on posi 8.5 from cureless.View attachment 54555 little crusty but nothing a wire wheel and paint can't fix. Going to need new brake lines and wheel cylinders. Can you see the quarter inch drive socket on the bleed screw?View attachment 54556
Just FYI, I've got a shop here that is blasting and coating mine for only $200. I expected more for an entire rear end so thought you might want to consider it? You will probably never have to touch it again.