71 C-10 Rear Differential problems??

[djinva]

I am having rear diff problems. Looks like I am going to need spider gears, axle gears, possibly a carrier. I may just buy a whole rear end. I am just looking at my options and I am not sure what years fit. Can I use the carrier out of a later model leaf spring rear? Can I use an older 6 lug rear and use my 5 lug axles?

71 C-10 12 bolt, 3.73 posi with coil springs. I am willingly to go with a non-posi and a higher gear ratio.

If you have answers or parts I would appreciate any help.