Look at my original post. This thread is from 2010.
For the record, I am have a 14 bolt rear and 60 front to turn 40"s.
that's something I completely missed
The exception to the rule dug up this old thread ... and whatever 'wheel the HELL outta my jeep' means ...
Originally Posted by offroad349
I have a 2000 TJ running 37's on a stock D30, 4.88 gears, inner C Gussets, stock shafts, and I wheel the HELL outta my jeep with no problem. I have a buddy who runs 40's on a 2014 JK STOCK D30 with no problems....its all in how you drive. Good Luck!!
Yeah no worries. I was a bit surprised when I saw this one resurface. It has some valid discussion points.
1) A D30 just won't hand 37's with the terrain I am used to.
2) I've seen JK 44's handle 37's with a lot of work done to them.
3) Going from 35 to 37 wasn't going to be worth it unless I spent a pile of money on crate axles.
4) The junkyard route for one tons was far easier to turn large meats
Heck, I blew up a D60 short side shaft on the first slick rock trail I was on. Anything can break, some just less than others!
From what I recall it does make a difference if it is a TJ or JK rear 44. I had a TJ rear 44. Different spline count than the JK. From the factory it is a 30 IIRC and can be upgraded to a 35 spline. I think the JK was 32 or 33 from the factory and was larger. The front 44 in the JK has a larger ring gear than the D30. It is more amenable to being built up with chromos and gussets and handling 37's.
I had a 35 spline carrier and and alloy shafts in my rear 44 when I had it. It handled the 35's with no issue at all. It may have handled 37's. I know someone running 37's on TJ rubi axles and has not problems yet.
It was when I wanted to go bigger that it became the problem. At the time I could fit 37's without anymore stretch, lift, and sheet metal being cut. The cost to get a matching front was the problem. After doing some figuring and predicting an end goal I ended up in a larger direction.
After considering crate axles, JK junkyards, truck D44's, and many other options... I went with a 60/60 combo. That didn't last the summer as the 30 spline rear 60 twisted a chromo on the first day out.
I ended up slinging in a 14 bolt mid summer. So far so happy.
I need to go back and do a 35 stub conversion on the front 60, but all is time and money.