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Old 04-08-2008, 08:27 PM   #1 (permalink)
 
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Gears 5.13 or 5.38 ?

Am currently running 35" tires on a TJ with the following specs:
4.0 I6, ax15 manual tranny, np231 w/ 4.1 , 4.56 gears, 6" suspension with all the body armour. Drive to the trail.

Want to go the 37" mtr's. What gears should I put in 5.13 or 5.38 ? Also anyone running 37" w/ manual tranny and 4.56 gears. If so, have is the Hwy ride and performance on the trail ?

Dont want to spend $1,000 if I dont have to.

thanks
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Old 04-08-2008, 11:31 PM   #2 (permalink)
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Even with 37" tires, I think even 5.13s would be a bit much, especially if you've got a 4:1. Swap on taller tires, drive, then decide,....
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Old 04-09-2008, 12:22 AM   #3 (permalink)
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X2. With the 4.1, you're not going to be in too bad of shape even with 4.56's. Do you currently feel under geared with the 35's??
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Old 04-09-2008, 07:33 AM   #4 (permalink)
 
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It is real close. with 35's feel a tad under powered.

think you're right. put on the 37's and then decide.

thanks
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Old 04-09-2008, 08:17 AM   #5 (permalink)
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I just jumped up to 37's from 35's and I'm running 4.88's on a Rubicon. The crawl ratio is back to stock now with 37's and I don't notice much difference with the 37's vs. the 35's, other then my spedo is more accurate now . I agree with the others though...see what it's like first & then decide. It all depends on how much street use it sees as well.
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Old 04-09-2008, 08:27 AM   #6 (permalink)
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What axles do you have under this Jeep?
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Old 04-09-2008, 08:32 AM   #7 (permalink)
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I am running 36" iroks with a 4.0/ax-15/stock 231/ 4.88's. Great on the street, need lower for trail work. I DD'd the rig for over a year. 5.13 or 5.38's would have killed it for daily driving, but made it perfect for the trail.

Not sure if that helps or not... my MJ is a bit lighter than a TJ. 2,000 RPM's is about 55 mph in mine.
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Old 04-09-2008, 08:36 AM   #8 (permalink)
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Quote:
Originally Posted by Little Jeep View Post
What axles do you have under this Jeep?
That was kinda what I was wondering as well. If you are running stock axles, stick with your 35's and 4.56's. It would be a real shame to waste $1,000 regearing, only to have the axles grenade on you at every outing.



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Old 04-09-2008, 09:00 AM   #9 (permalink)
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If its driven alot like a DD, stick to 4.88 with 37's. If its a pure toy and sees time on a trailer to the trail, 5.13's. This is all assuming you have the axles to support this. But if you still got stock axles, stay with 35's until you can get some more beef.

FYI, I am running the 4.0, ax-15, 4:1 tcase, 5.38's, 3/4 ton axles, 36's and I love my crawl ratio. Will be stepping up to 40's this month for the tinbenders outing. But my rig is a pure toy. I don't rely on mine for a DD. So its game on when building my rig.
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Old 04-10-2008, 10:05 AM   #10 (permalink)
 
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What axles do you have under this Jeep?
Running Dana 44's F/R. Waggy Front and TJ rear. Warn outer shafts and original waggy inners Front. Dutchman axels rear. 5 on 5.5 bolt apttern.

Drive to trail only and every once in awhile around town
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Old 04-10-2008, 12:21 PM   #11 (permalink)
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then go 4.88's.

If you 5.13's you will loose a little bit of hwy friendlyness
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Old 04-10-2008, 02:22 PM   #12 (permalink)
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I went through this same dilemma when I put my HP44 in the front. I have 35s right now and went with 5.13s for later upgrade to 37s. I had 4.56s and with 35s it felt under powered on and off road. I do not have a 4:1 transfer case so I can not speak to that but my next upgrade is a STAK 3 speed case(because I like the fact I will have a krawl ratio and a stock ratio) and 37 Krawlers. I like having the 5.13s and believe me is does fine at cruising speed. Just me $.02.

My Jeep specs:
98' TJ 4.0L AX15 stock transfer case ford 8.8 and HP44.
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