Back in Dec, I bought a 78' C10 Bonanza with 5.3 Vortec (LM7) out of a '03 Tahoe, and a 4L60 auto trans. Recently, found the right rear axle seal leaking so decided I'd pull the rear end apart and change the wheel bearings and seals. I removed the differential cover and center pin retaining bolt, but the center pin barely moved. I banged on that thing for about three hours with a 2lb hammer and brass punch, and only managed to move it about 3/4''.
I noticed the pin was pretty beat up where it appeared to ride in the spider gear, so I believe it was run without oil for a while and caused some burs on the pin.
Anyway, I want to replace the rear end, but needed some advice. I found the numbers on the ring gear and it looks like the rear end is actually and 84. Here are the numbers: 15 41 4 84.
My question is, what rear end should I be looking for? Should I stick with the 2.73:1 ratio, or am I free to look at other gears? Also, what years are compatible with this engine and trans?
Just using the truck as a daily driver and to haul my boat.
Thanks everybody!!!