I've been running 37's on sport axles, dana 30 and dana 44 with 4.88 gears. I do rock crawling about 4 times a year. I have broken two axles but in reality, that's not too expensive compared to going to 1 tons and everything else required. I have a 6 sp manual and it crawls great with all my friends with 40's and 1 tons.
I absolutely agree that it's all about the driver. If you try to drive it like a rock bouncer with the 37s, yeah things are gonna break and bend. Driver mod above all else
Well, you both know full well some of the crazy shenanigans Gypsy has been involved in and how much I can yeet! She was on stock D30/35 axels/gears and open diff with 4in lift and 37s for 75k miles before we did the axel swap. No bending or damage. Only upgraded because I wanted lockers!
WELLLL, clearly we did NOT know that, and I am mortified. I swear I saw that when I looked up my VIN after I bought it a few years ago. We are so grateful to you for bringing that to our attention! I guess it's only HALF as bad an idea as we originally thought. 😜
If you're not locked, the D30 will live with a moderate skinny pedal. The first weak link is the axle U-joints. There are ways of addressing this: inner full circlip joints, Almost alloy weld on caps, or of course RCV shafts. A high spline count carrier (GrizzlyLocker, etc.) combined with axle shaft mods nets great results. The next weak link becomes the ring and pinion. Again, a moderate pedal greatly extends the lifespan of your parts. Bending the housing on a D30 generally only happens with high abuse; a truss or inner sleeving the tube (I pressed in and rosette welded hot rolled tube inside my XJ axle tubes) alleviates much of that worry. If you don't sky it out you should be OK.
Thank you, this confirms what we were thinking as well. Truss and sleeving has been discussed, and may happen. Honestly though, with the 5:13 gears, I rarely have to gas it. I just take my foot off the brake and she'll crawl pretty much anything. Hope you'll follow along!
I been running 37’s with d30 for over a year now, I did change the gears to 4.88. So far is good. My 37 are actually lighter than the 35’s I had. Only time will tell! 😎
Its the same housing as the dana 44 so its been there and done that; the actual difference is that the dana30 axles have no real gears inside of them so they can blow up
I was in Vernal earlier this year, and a friend slowly crawled down a steeper hill while making a turn with all of her weight on the single front axle and the snap was so loud!! Sooner or later, you'll definitely break, even if you it easy on 37's. She was on 35's, and she wheels light. I would say it took 4 years to break though, but it did sour the rest of her day 😏
I ran 37’s on a Dana 30 for 10 years. Changed the axle shafts and gears to 4.56. Did most of the trails in central California including the rubicon. Never had a problem with the Dana 30. Don’t try to bunny hop rocks and you will be fine
yep it will be fine I'm putting 37's on my Jeep tj with dana 44 rear and 30 front regeared and all the goodies. Hawat damn its going to cost a pretty penny! But cheaper than buying a new Jeep hahaha! Great lookin rigs!
When I looked up gear sets for my D30, the one gear manufacturer stated that the gear set was not guaranteed with tires bigger than 33". Since then, I have seen 1 Jeep that ran 37s on a 30, but that guy doesn't really go off road, so I am still curious if those tires on that axle will really break gears under modestly aggressive driving. When I looked up the same gear set for my D44, there was no tire size limit listed.
We blew up a set of gears shortly after we switched them out. 😅 That being said, I also really got in it and I bounced it, which we know is a killer. I don’t think it was the tires as much as that. Since then, we’ve done some wheeling and have been intentional with the gas pedal, and it’s all good…so far. 😊
I am forever wondering the same thing. I think mine is the exception to the rule! HAHA I know for a fact you are not alone. Our other Jeep is like yours - it's scary to drive sometimes!! Add that Oklahoma wind and you could be blasting off to the moon if you hit a pothole wrong. Coincidentally, it's also a '14. Wonder if there's something to that?
I have a 13 two-door sport I've been running 37 bfgs for over 7 years, Dana 44 in the rear with a mini spool Yukon chromoly axles and Dana 30 in the front Yukon axles lock write Locker 488 gears Adams Drive Shaft CV delete, had a guy here in Florida break into the computer unlock it and create 18 so that I can run the Spool in the rear no lights or limp mode I will the hell out of my Jeep, yes every once in awhile I break something but it's usually an Axel not a big deal the Yukon chromoly axles can take pretty good punishment, don't underestimate a Dana 30 I know people will laugh but when it's all said and done my Jeep is extremely lightweight and that's the thing I was really trying to achieve mostly flat trail riding in a lot of mud here in Florida
People will also say that you cannot run a spool on a JK in the rear you can if you get the delete in the computer there's a guy in Middleburg Florida tuners Inc. Does mostly Fords my jeep was the first one that he experimented with it took a long time but he was able to break into the computer and create a tune to run a spool, now that he has the program he's done a few more
@@Expedition-FullSend it will help I did put hd ball joints in mine and it gets wheeled so hard I exploded the rear 44 diff new arb sitting in the e garage now waiting on me
Hi there! We have 5:13 gears in this Wrangler. That killed the MPGs when we were running 35s. When we went to 37s it brought the ratio down which brought the RPMs down which then brought the MPGs up. With 35s the RPMs ran about 3300 at highway speeds but going to 37s brought that down to around 2700. That's a HUGE difference in effort hence the increase. Does that make sense?
If you go with a Teraflex full float kit on dana 44's you will end up with 44 / 60 axles. Dana 60 outers. 4.88 gears should be your max. Because anything lower you end up with a pinion gear the size of a peanut. You don't want that. Ypur pinion gear will fail eventually. This is a copy of what us old ti.ers did back in the day with Ford 9 inch and 60 outers. A JK 44 has an 8.8 inch ring gear just a smidgen less then a 9 inch. It works.
We're also in OKC, and we actually were at Axcel's even on Saturday! We're even friends on FB. LOLOLOL We just haven't had a chance to wheel with y'all yet, so that's probably why it doesn't click. Soon. :D
Yes, after catching our mistake, we learned that you are correct. I had originally been told it was a D35 by someone who owned a JL. Turns out, that only applies to JLs. I just assumed it was the case for JKs too without taking the time to confirm. I bet I won't do that again! HAHA
Run it! You won’t know until you do. I’ve never run 37s on a 30. Largest size tire was a 35. Axle was in my XJ. Broke both axle shafts on the Rubicon before getting to any of the hard obstacles. In my experience, it’s just a matter of time before a Dana 30 lets go. I wouldn’t dump money into building up a 30 for 37s. You’ve got free 5.13 gears and 30s of today are an improvement over 30s of yore. Run what you got and start putting money towards a better axle in the meantime. You’ve got nothing to lose and the experience will make you a better Jeeper.
Thank you! That is precisely our line of thinking. It's likely that the weak spot will be the U-joint/axle shaft, and that can be replaced fairly cheaply. We talked about doing chromoly shafts, but that shifts the weak point to the ring and pinion, and we'd like to avoid breaking that if possible. That leaves the axle housing as another weak spot. I think a truss might help give us a slight advantage on that end, but it will eventually give out, as you said. We're going to have fun trying to make it last as long as we can!
I've been running 37's on sport axles, dana 30 and dana 44 with 4.88 gears. I do rock crawling about 4 times a year. I have broken two axles but in reality, that's not too expensive compared to going to 1 tons and everything else required. I have a 6 sp manual and it crawls great with all my friends with 40's and 1 tons.
Definitely agree! Our thoughts exactly! Dozens of axle shafts replaced before paying for tons.
I absolutely agree that it's all about the driver. If you try to drive it like a rock bouncer with the 37s, yeah things are gonna break and bend. Driver mod above all else
100%! I try really hard not to send it unless there is no other option, and even then, there are usually options. ;)
Well, you both know full well some of the crazy shenanigans Gypsy has been involved in and how much I can yeet! She was on stock D30/35 axels/gears and open diff with 4in lift and 37s for 75k miles before we did the axel swap. No bending or damage. Only upgraded because I wanted lockers!
Fun fact: all four door JKs (JKUs), except early 07 models, came standard with D44 rear axles
WELLLL, clearly we did NOT know that, and I am mortified. I swear I saw that when I looked up my VIN after I bought it a few years ago. We are so grateful to you for bringing that to our attention! I guess it's only HALF as bad an idea as we originally thought. 😜
If you're not locked, the D30 will live with a moderate skinny pedal. The first weak link is the axle U-joints. There are ways of addressing this: inner full circlip joints, Almost alloy weld on caps, or of course RCV shafts. A high spline count carrier (GrizzlyLocker, etc.) combined with axle shaft mods nets great results. The next weak link becomes the ring and pinion. Again, a moderate pedal greatly extends the lifespan of your parts. Bending the housing on a D30 generally only happens with high abuse; a truss or inner sleeving the tube (I pressed in and rosette welded hot rolled tube inside my XJ axle tubes) alleviates much of that worry. If you don't sky it out you should be OK.
Thank you, this confirms what we were thinking as well. Truss and sleeving has been discussed, and may happen. Honestly though, with the 5:13 gears, I rarely have to gas it. I just take my foot off the brake and she'll crawl pretty much anything. Hope you'll follow along!
Damn I thought I was crazy runnning 38s on JLUR D44s with RCVs.
That’s not crazy in our book!!
I been running 37’s with d30 for over a year now, I did change the gears to 4.88. So far is good. My 37 are actually lighter than the 35’s I had. Only time will tell! 😎
That's the same for us, regarding the weight. Is it more of a mass issue? I guess we'll see! LOL
Do the 4.88’s do well with 37’s or you think 5.13’s would work better?
@@ColoradohighboyI guess it all depends on where you ride the most. Is my daily n trails in FL aren’t hard so 4:88 works fine for me.
Well done! 👌
You can do ittttttt! 😂 We ain’t skeered
Its the same housing as the dana 44 so its been there and done that; the actual difference is that the dana30 axles have no real gears inside of them so they can blow up
2018 Jeep Wrangler Sport JLU on 37s. Off roading in Arizona and now out in Kentucky. No issues.
I was in Vernal earlier this year, and a friend slowly crawled down a steeper hill while making a turn with all of her weight on the single front axle and the snap was so loud!! Sooner or later, you'll definitely break, even if you it easy on 37's. She was on 35's, and she wheels light. I would say it took 4 years to break though, but it did sour the rest of her day 😏
I ran 37’s on a Dana 30 for 10 years. Changed the axle shafts and gears to 4.56. Did most of the trails in central California including the rubicon. Never had a problem with the Dana 30. Don’t try to bunny hop rocks and you will be fine
I've been at it with my jeep for 4 years and I still don't know what I am doing, but I think I am getting good at breaking stuff on it.
Hahaha spoken like a true Jeeper! 😂
Running 37's on our 07 jk, 3.21 factory gears, no trusses. It is a manual so at 65 you run 4th gear, no sweat. My wife's daily.
Got stock Sahara on 33s, I think this is enough for most offroading
yep it will be fine I'm putting 37's on my Jeep tj with dana 44 rear and 30 front regeared and all the goodies. Hawat damn its going to cost a pretty penny! But cheaper than buying a new Jeep hahaha! Great lookin rigs!
As long as common sense stays in the pic, you will be fine. Subscribed.
We appreciate you following along!! We're looking forward to bringing you some quality content. :)
When I looked up gear sets for my D30, the one gear manufacturer stated that the gear set was not guaranteed with tires bigger than 33". Since then, I have seen 1 Jeep that ran 37s on a 30, but that guy doesn't really go off road, so I am still curious if those tires on that axle will really break gears under modestly aggressive driving. When I looked up the same gear set for my D44, there was no tire size limit listed.
We blew up a set of gears shortly after we switched them out. 😅 That being said, I also really got in it and I bounced it, which we know is a killer. I don’t think it was the tires as much as that. Since then, we’ve done some wheeling and have been intentional with the gas pedal, and it’s all good…so far. 😊
Yes when you measure the height after at the trailer hitch you can see the rear axle it’s a Dana 44
DOH. 😅We've got another video coming out soon that addresses this.
I need to know.. how do you drive 70mph and take your hands off the wheel? My ‘14 JK is all over the lane at that speed 😅.
I am forever wondering the same thing. I think mine is the exception to the rule! HAHA I know for a fact you are not alone. Our other Jeep is like yours - it's scary to drive sometimes!! Add that Oklahoma wind and you could be blasting off to the moon if you hit a pothole wrong. Coincidentally, it's also a '14. Wonder if there's something to that?
I have a 13 two-door sport I've been running 37 bfgs for over 7 years, Dana 44 in the rear with a mini spool Yukon chromoly axles and Dana 30 in the front Yukon axles lock write Locker 488 gears Adams Drive Shaft CV delete, had a guy here in Florida break into the computer unlock it and create 18 so that I can run the Spool in the rear no lights or limp mode I will the hell out of my Jeep, yes every once in awhile I break something but it's usually an Axel not a big deal the Yukon chromoly axles can take pretty good punishment, don't underestimate a Dana 30 I know people will laugh but when it's all said and done my Jeep is extremely lightweight and that's the thing I was really trying to achieve mostly flat trail riding in a lot of mud here in Florida
People will also say that you cannot run a spool on a JK in the rear you can if you get the delete in the computer there's a guy in Middleburg Florida tuners Inc. Does mostly Fords my jeep was the first one that he experimented with it took a long time but he was able to break into the computer and create a tune to run a spool, now that he has the program he's done a few more
@mikemay7134 care to post his info?
@FahimibnDawud his name is Tony his business is tuners ink. Middleburg Florida
What exhaust is she running on her jeep? Sounds pretty good
We're running the Red Rock Cat Back Exhaust system. We love it!
37s on my 30 front ball joints are your concern I did truss mine and I absolutely beat the shit out of it
Trussing definitely is on the list!
@@Expedition-FullSend it will help I did put hd ball joints in mine and it gets wheeled so hard I exploded the rear 44 diff new arb sitting in the e garage now waiting on me
@derekdean2614 haha nice!! #sendit
Dana 44's aren't rated for more than 35's...so yes, those sport axles will eventually break. So long as you are okay with that, you do you.
Why don't you sell the existing axles while they are still good and unstressed.
I'm new to jeeps and just bought my first Wrangler. So you went to 37" tires and are getting 4mpg better than the 35's???? How's that possible
Hi there! We have 5:13 gears in this Wrangler. That killed the MPGs when we were running 35s. When we went to 37s it brought the ratio down which brought the RPMs down which then brought the MPGs up. With 35s the RPMs ran about 3300 at highway speeds but going to 37s brought that down to around 2700. That's a HUGE difference in effort hence the increase. Does that make sense?
Do jeeps come standard with the engine light on
HA! It sure seems that way. It's okay though - it makes them go faster! ;)
If you go with a Teraflex full float kit on dana 44's you will end up with 44 / 60 axles. Dana 60 outers.
4.88 gears should be your max. Because anything lower you end up with a pinion gear the size of a peanut. You don't want that. Ypur pinion gear will fail eventually. This is a copy of what us old ti.ers did back in the day with Ford 9 inch and 60 outers. A JK 44 has an 8.8 inch ring gear just a smidgen less then a 9 inch. It works.
we need more vids like this
On it!
Where at in Oklahoma are you? I'm OKC and haven't seen y'all.
We're also in OKC, and we actually were at Axcel's even on Saturday! We're even friends on FB. LOLOLOL We just haven't had a chance to wheel with y'all yet, so that's probably why it doesn't click. Soon. :D
Didnt they only use the d35 in the first year of the JKs?
Yes, after catching our mistake, we learned that you are correct. I had originally been told it was a D35 by someone who owned a JL. Turns out, that only applies to JLs. I just assumed it was the case for JKs too without taking the time to confirm. I bet I won't do that again! HAHA
How many miles per gallon?
I went from about 12 to 16 to as much as 19 on the highway at 70 for long trips. Gear ratio is finally well matched to the tires.
Run it! You won’t know until you do. I’ve never run 37s on a 30. Largest size tire was a 35. Axle was in my XJ. Broke both axle shafts on the Rubicon before getting to any of the hard obstacles. In my experience, it’s just a matter of time before a Dana 30 lets go. I wouldn’t dump money into building up a 30 for 37s. You’ve got free 5.13 gears and 30s of today are an improvement over 30s of yore. Run what you got and start putting money towards a better axle in the meantime. You’ve got nothing to lose and the experience will make you a better Jeeper.
Thank you! That is precisely our line of thinking. It's likely that the weak spot will be the U-joint/axle shaft, and that can be replaced fairly cheaply. We talked about doing chromoly shafts, but that shifts the weak point to the ring and pinion, and we'd like to avoid breaking that if possible. That leaves the axle housing as another weak spot. I think a truss might help give us a slight advantage on that end, but it will eventually give out, as you said. We're going to have fun trying to make it last as long as we can!
Thats definitely a D44.
WTF
why are you calling them sport axels?
It is a JKU with the Sport trim. Rubicons come with Dana 44 front and rear. Sports have a Dana 30 in front.
@Expedition-FullSend everyone knows that.
@@MUCKFOOT399 then why did you ask? 🤔