What’s the most the stock axle and transmission can take?
 

Yup, I’m new to the forum :icon_woot:
I’ve tried searching here and google but I am still having trouble finding an answer.
Currently looking at a 1999 2500 5.9 V8 with 110K (automatic).
The truck is really clean and looks well taken care of. Has a huge lift. And the guy has stuffed some 42in tires in there. He used to have 37s.
Im really just wondering if the axles can even take that? And the transmission.
Whats the limit of wheel and tire size on the transmission and axle?

That truck is going to have Dana 60's front and rear, and the rear is a full-floater. Pretty stout. My biggest concern is in line with what the cat above me is talkin' about. What gears in the diffs?

I think it has a dana 60 front and dana 70 rear.

D70 only if it had a manual. OR V-10, or diesel. (D80 if V-10 or diesel, and manual trans.)

A big set of tires does make an auto transmission or a clutch work harder. For the auto tranny, a trans cooler will help. For the stick tranny, make sure the clutch is in good shape.

I would be more worried about the trans. :) Gears make a BIG difference here. With 42" tires, I would want AT LEAST 4.88 gears...... if not 5.12....... If you have something lower (numerically) in there, that's gonna DRASTICALLY shorten trans life.

the trans will not last long at all without re gearing the axles for larger tires. Minimum gear set should be 4:10's for 35" tires. But if you want stock power band (and not a complete dog) go 4.56 for 35's and 4.88 for 37's.
The axles should hold up OK to street use with the 42's though the front ball joints and wheel bearings are probably close to shot. Alot of this depends on the offset of the wheels too.
Post up some pics of this beast on 42's!