broke the trail gear 4.7 input

[bamatoy]

What axle ratio are you guys running that are breaking input/output shafts? Just curious. I have never broken any tcases just cracked 2 30 spline longs and 1 r&p in the rear on 8 years. 6 years of driving to and from the trails( including to tellico and back to bama several times ) . I was wondering if there is a underlined problem elsewhere,(ruling out anything bigger than a 22r) or just quality of material of some of the newer parts. Not disputing what you guys are saying about the front case in high, but from my experience I just haven't seen it round here enuf to say either way.

 

[BUG-E J]

Higher gears in the axles puts more stress on the cases. I ran stock duals and yukon treated 529s and had no case problems. Buddy or mine had stock gears and ultimate duals. Front case low back high would blow it. I think he blew a case one time too. We ran 39.5s too.

 

[TBItoy]

Me and by buddy mike both run 4.10s (because that's what the factory hi pinion diffs that we have are).

We did have mike's truck setup with 5.29s, but after 3-4 years the front broke the center pin (4 cyl) and ring gear, and the rear ring had some chipped teeth (and both rear axles were twisted to ****).

We put 4.10s f/r with a hi pinion front, and chromo rear axles, then he started busting tcase parts.

So far with the built tcases, 4.10s, and 36s, he has been (drivetrain) breakage free for 2 years.

 

[matth_85]

I ran a 23 spline 4.7 rear case and always ran gravel roads in front low. Never hit any obstacles without rear case in low or double low. If 4.7 was too much, I always grabbed 2nd gear. It rarely was though...haha. I ran 5:29's for the longest time and broke 6 sets of ring and pinions and a center pin or two. I switched to FJ62 axles with 9.5" ring gears and stock 4:10's and never had an issue but broke a rear output then. Didn't run that setup but about 5 rides before I sold it though. Basically, just keep the rear in low and you should have much better luck.