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37s on dana 30? Anyone doing this?

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Old 05-04-2016, 06:45 PM
  #31  
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Originally Posted by TweakJK
THIS RIGHT HERE. I had a buddy that ran 3.21's on 37's (he now has 4.10's and 40's). He had to smash into every rock, ramp over every obstacle, just to keep up and not stall. His excuse was "oh well my ring gear is stronger." There I was with 5.38's and 37's, Idling up every obstacle that he was hitting wide open. He also refused to air down, saying that he would get too much traction and break parts. "higher gears means a stronger axle" translates to "I'm too lazy to install proper gears" It may be stronger, but you are increasing shock loads and breaking everything else. And honestly making your wheeling experience less fun.
So I take it you didn't have a Dana 30
Old 05-05-2016, 09:16 AM
  #32  
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I currently have a JKU Freedom edition (front is a D30) and Im having 37x13.5 with 4.5 lift installed I'm also regearing to 4.88 and putting sleeves and gussets on. Regardless of what others are saying I feel confident about how the axle will hold up. Anything could happen though but If your an abuser or if you aren't prepared for the worst then I wouldn't do it.
Old 05-05-2016, 10:53 AM
  #33  
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Originally Posted by Nassd89
I currently have a JKU Freedom edition (front is a D30) and Im having 37x13.5 with 4.5 lift installed I'm also regearing to 4.88 and putting sleeves and gussets on. Regardless of what others are saying I feel confident about how the axle will hold up. Anything could happen though but If your an abuser or if you aren't prepared for the worst then I wouldn't do it.
That is the key part to this discussion. The facts are that 37s and a heavy JKU definitely exceed what a D30 was designed to do. Does that mean it is guaranteed to fail? No. Do people run that setup without failure? Yes. You have to go into it being willing to pay to play. Assume you will break a ring gear. If you don't have the budget to buy new gears and pay for labor, then you are playing with fire.

"Going easy" on a D30 is really not going to reduce risk of failure by much. Most of the ring and pinions we have seen break, have happened while crawling. We broke a 44 front ring gear crawling in 4lo with a Rubi t-case in a manual trans with zero throttle. A little wheel slip and then hooking up is all it takes sometimes.
Old 05-05-2016, 05:01 PM
  #34  
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Originally Posted by Chuck-The-Ripper
So I take it you didn't have a Dana 30
no, but the point is still the same. If it had been a sport with 5.13's, the result would have been the same.
Old 05-05-2016, 07:29 PM
  #35  
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Well there ya go. A answer to all your what ifs.... Lol aren't forums great. You made up your mind before ya asked the question lol! 37s axle later

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Old 05-05-2016, 07:30 PM
  #36  
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Unless your mall crawling

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Old 05-03-2021, 04:56 AM
  #37  
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Originally Posted by kyle521
Ive broken a d30 axle shaft, and now busted the carrier, all while on 35s. You may get by, but dont expect it to last very long
Thing is though, people broke D60 running 40s just the same. Doesn't mean a D60 cant run 40s.
Old 05-03-2021, 05:37 AM
  #38  
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Way to bring up a 5 year old thread.



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