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Unread 11-16-2013, 07:13 AM   #16
offroad349
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I gotta upgrade the profile, did an inline6 swap haha

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Unread 11-16-2013, 08:14 AM   #17
Iceman_RNR
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it pops up every so often, but 37s on a TJ is the breaking point (literally), regardless of (HP)Dana30 or Dana44 and strengthened axles or not.

OP: what's the upside of running 37s instead of 35s for you at this point? It takes money to make that step ...
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Unread 11-16-2013, 08:58 AM   #18
Jeepin72
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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.
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Unread 11-16-2013, 11:49 AM   #19
Iceman_RNR
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Quote:
Originally Posted by Jeepin72 View Post
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 ...
Quote:
Originally Posted by offroad349 View Post
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!!
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Unread 11-16-2013, 03:08 PM   #20
Jeepin72
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Yeah no worries. I was a bit surprised when I saw this one resurface. It has some valid discussion points.

IMO
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!
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Unread 11-16-2013, 03:11 PM   #21
Ironhead
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what about a rubi 44 rear with arb and alloys? i know the fronts weaknesses, but it seems like the only thing holding the rear rubi44 back is the lsd carrier
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Unread 11-16-2013, 03:33 PM   #22
Jeepin72
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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.
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37s , dana 30 , dana 44

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