pplummer it's tough being a new guy
so welcome
best to search in driveline but you could in ALL categories. i just typed in rear end. i got dozens of threads but only gave you two. there are links with/IN links/threads. enjoy your reading.
sometimes when you get to specific it gets tougher, so limit your search down to simple words here. we're simple folk.
hope it helps you and any others.

I'm using a 1977 1/2 ton suburban 6 lug, 4x4 drum brake rear end, i live in the foothills and have a 3.40:1 ratio and a 292 w/ a T5 hybrid tranny. the offset (rear wheel set back to center the wheel in the fender well) i have is 2-1/2'', not the usual 1-1.2'' that the venders sell. brake shoes are 2.75'' wide, have great stopping power. disc up front. w/ disc you can NOT use stock rims.
SO are you sticking w/ 6 lug or 5 ?????
many questions to answer b4 you make decisions

2.xx & 3.08 are (2.xx great for flat kansas land) geared high but >> it all depends on what you use for engine & trans. 4.xx are better for towing.

my .02 wink
3.73:1 are a favorite choice


Jim & Caroline
The highway is for gamblers, better use your good sense."
Gooday-that's my 1¢ answer due to the lousy economy ~ cause I ain't got - no . mo . doe

Every Shaver | Now Can Snore | Six More Minutes | Than Before ... | Half A Pound for Half a Dollar | Spread On Thin | Above the Collar || BURMA-SHAVE