37" tires on dana 30
JK Jedi
Joined: Jun 2012
Posts: 5,255
Likes: 11
From: Bellmawr, NJ
I was just getting ready to ask the same question, as far at the 3.21 gears with 37's i've seen a couple folks here still running them, but i would imagine it would be pretty sluggish down low, auto trans or stick,, local shop quoted me $1200 for reinforcing and gusseting the front. seems a tad high, but it is past my skill level.. seen some nice rigs on here in the thread "37 club show and tell post" looks like it dates 3 years back,,
looking to do a 4 lift, 1.25 bod lift and a 20in 37 wheel tire package, very lite trail and beach use..
looking to do a 4 lift, 1.25 bod lift and a 20in 37 wheel tire package, very lite trail and beach use..
JK Junkie
Joined: Jan 2012
Posts: 2,828
Likes: 0
From: Auburn Maine
I stayed away from 35's because based on everything I could find it said that the axle's and drive shaft could likely fail...
So I have 33" Duratrac's with a 3" lift for now
Matthew
Forum Tech Advisor
Joined: Jan 2008
Posts: 1,208
Likes: 11
From: Billings, MT
An unlocked axle, on a rig with an automatic tranny, that is not very heavy, and that doesn't get off roaded can handle 37s for a long time.
Other than maybe gussets, it is a waste of money to do upgrades on a D30 axle that will be run locked under a heavy JK.
You can find take-off Rubicon D44s for as low as $2k. If they have been regeared and gusseted already, you can find them for as low as $2.5k. If they have RCVs and upgraded ball joints, in addition to being regeared, they go for maybe $3k.
By the time you upgrade a D30 with cromoly shafts, a selectable locker, gussets and truss or sleeves, and regear it--particularly if you oay for labor--you will be into the D30 heavier $-wise than just buying a take-off Rubi D44. Plus, you will have smaller spline shafts and a smaller pinion shaft in the D30.
Now, if everyone takes my advice to skip putting money into D30s and buy take-off D44s, the used prices will go up and the value won't be as great. Until then, it makes no sense to significantly upgrade and lock a D30 and run 37s on an axle that will fail--not if, but when is the question.
Other than maybe gussets, it is a waste of money to do upgrades on a D30 axle that will be run locked under a heavy JK.
You can find take-off Rubicon D44s for as low as $2k. If they have been regeared and gusseted already, you can find them for as low as $2.5k. If they have RCVs and upgraded ball joints, in addition to being regeared, they go for maybe $3k.
By the time you upgrade a D30 with cromoly shafts, a selectable locker, gussets and truss or sleeves, and regear it--particularly if you oay for labor--you will be into the D30 heavier $-wise than just buying a take-off Rubi D44. Plus, you will have smaller spline shafts and a smaller pinion shaft in the D30.
Now, if everyone takes my advice to skip putting money into D30s and buy take-off D44s, the used prices will go up and the value won't be as great. Until then, it makes no sense to significantly upgrade and lock a D30 and run 37s on an axle that will fail--not if, but when is the question.
Last edited by planman; Aug 21, 2013 at 07:51 AM.
JK Junkie
Joined: Jan 2012
Posts: 2,828
Likes: 0
From: Auburn Maine
I was just getting ready to ask the same question, as far at the 3.21 gears with 37's i've seen a couple folks here still running them, but i would imagine it would be pretty sluggish down low, auto trans or stick,, local shop quoted me $1200 for reinforcing and gusseting the front. seems a tad high, but it is past my skill level.. seen some nice rigs on here in the thread "37 club show and tell post" looks like it dates 3 years back,,
looking to do a 4 lift, 1.25 bod lift and a 20in 37 wheel tire package, very lite trail and beach use..
looking to do a 4 lift, 1.25 bod lift and a 20in 37 wheel tire package, very lite trail and beach use..
Plan on going to 4:10's pretty soon.
Matthew
JK Super Freak
Joined: Oct 2010
Posts: 1,444
Likes: 1
From: East Meadow, NY
An unlocked axle, on a rig with an automatic tranny, that is not very heavy, and that doesn't get off roaded can handle 37s for a long time.
Other than maybe gussets, it is a waste of money to do upgrades on a D30 axle that will be run locked under a heavy JK.
You can find take-off Rubicon D44s for as low as $2k. If they have been regeared and gusseted already, you can find them for as low as $2.5k. If they have RCVs and upgraded ball joints, in addition to being regeared, they go for maybe $3k.
By the time you upgrade a D30 with cromoly shafts, a selectable locker, gussets and truss or sleeves, and regear it--particularly if you oay for labor--you will be into the D30 heavier $-wise than just buying a take-off Rubi D44. Plus, you will have smaller spline shafts and a smaller pinion shaft in the D30.
Now, if everyone takes my advice to skip putting money into D30s and buy take-off D44s, the used prices will go up and the value won't be as great. Until then, it makes no sense to significantly upgrade and lock a D30 and run 37s on an axle that will fail--not if, but when is the question.
Other than maybe gussets, it is a waste of money to do upgrades on a D30 axle that will be run locked under a heavy JK.
You can find take-off Rubicon D44s for as low as $2k. If they have been regeared and gusseted already, you can find them for as low as $2.5k. If they have RCVs and upgraded ball joints, in addition to being regeared, they go for maybe $3k.
By the time you upgrade a D30 with cromoly shafts, a selectable locker, gussets and truss or sleeves, and regear it--particularly if you oay for labor--you will be into the D30 heavier $-wise than just buying a take-off Rubi D44. Plus, you will have smaller spline shafts and a smaller pinion shaft in the D30.
Now, if everyone takes my advice to skip putting money into D30s and buy take-off D44s, the used prices will go up and the value won't be as great. Until then, it makes no sense to significantly upgrade and lock a D30 and run 37s on an axle that will fail--not if, but when is the question.
Forum Tech Advisor
Joined: Jan 2008
Posts: 1,208
Likes: 11
From: Billings, MT
The one thing that concerns me about installing chromoly axle shafts and aftermarket ujoints is that by doing so wouldnt that make the ring and pinion the weak point which is more costly to replace than stock shafts and/or ujoints? I dont know much about this stuff so your input would be appreciated. Thanks
JK Newbie
Joined: Aug 2013
Posts: 73
Likes: 0
From: Philly-Uptown
un huh
I ran 37 km2 on my 2010 jku Sahara with factory 3.73s. NOT ONE PROBLEM. Didn't even have a problem hanging the 37 on my trail gate. Yes it was sluggish but it's a jeep, far as I'm concerned out was sluggish the day it rolled off the assembly line! Lol I'll post a pic in a lil bit, i don't have photos on my new phone