Questions about 79 Jeep Parts

[smays]

:help:
Hey guys I need some help. I’ve got a 79 cj5 with a 258 3speed I just added a 4in suspension and a 1in body. The first question is whether or not my cj could handle 35x12.50's next I found a guy that has an 81 cj with 4.11 gears and a 4speed he said he would sell me the drive train. I was thinking I might want it for my jeep but I don’t know enough. I know I probably wouldn’t go wrong with the 4.11 but what about the transmission and transfer case I know some are better than others but I don’t know what to look for also its out of 4 cylinder jeep will that make a difference.
If anybody has any advice it would be greatly appreciated.

Thanks in advance
SMays

[garlandg]

not sure on the transmission but the transfercase should be a dana300. front axle is a dana30 low pinion and the rear would be a amc20. the axles are probably the same as the ones you have. hope this helps.