1972 c10 ring and pinion swap.

[mike16]

I currently have a 72 with the 373 gears. about 5% of the time they are great for hauling. the other 95% of the time I wish I had an overdrive gear.

I dont suppose youl be hauling fire wood, cinderblocks or old cars with it.

you will be greatfull for the better milage and the current(?) or future use of an overdrive with a 342 gear set up. Your 308 differential "case" is compatible with any gear ratio bellow 373, so to choose a 342 ring and pinion will save a bit of money there, but 373 diff cases are quite common too and ought not to cost much either.

tough call . I like my 373 gears but sure wish It was more hiway friendly that 95% of the time.