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Old February 18th, 2008, 09:27 PM   #1
rockrat
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Default which gears to use?

my wife's zj has the stock d30/44 combo running 37x14.50x15's;
should we install 4.88's or 5.13's she like to mud run and I like to hill climb
Thanks for any help, we were going to get a winch 1st, but club members suggested gears 1st.
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Old February 18th, 2008, 09:27 PM   #2
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I'm pretty sure the highest a d30 can go is 4.88's, but I may be wrong. If you could go to 5.13's, I wouldn't, the pinion would be SO small.
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Old February 18th, 2008, 09:29 PM   #3
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Quote:
Originally Posted by ddeadserious View Post
I'm pretty sure the highest a d30 can go is 4.88's, but I may be wrong. If you could go to 5.13's, I wouldn't, the pinion would be SO small.
I agree....believe 4.88 is as low as you can go in the ZJ 30.
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Old February 18th, 2008, 09:35 PM   #4
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thanks, that's what I was thinking, at the dog party I had to get into the happy pedal alot more than I should've.
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Old February 18th, 2008, 09:36 PM   #5
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Is your ZJ a V8?
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Old February 19th, 2008, 06:07 PM   #6
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yep, 5.2L
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Old February 19th, 2008, 06:13 PM   #7
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4.88's, however they are not the lowest gear you can get for a d30, they offer a 5.38 for them
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Old February 19th, 2008, 06:17 PM   #8
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The pinion gear for the 4.88s for the D30 only has 9 teeth, I imagine the 5.38s probably has less. I wouldn't trust 37s on a D30, let alone one with that few of teeth on the pinion.
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Old February 19th, 2008, 06:44 PM   #9
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4.88 gear set has 39 on the ring and 8 on the pinion
5.38 gear set has 43 on the ring and 8 on the pinion...i'd go for the 5.38's if you really want a low crawl ratio. strength should not be an issue as far as R&P goes...i'd worry more about the spider gears and axle shafts or something else breaking.
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Old February 19th, 2008, 07:05 PM   #10
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As noted, there are 5.38s for Dana 30s, although not sure if the ZJ 30 will take them. They were of the CJ dana 30 type, no idea which of the several types of Dana 30 gears the ZJ uses.

But I agree, 37s + V8 + Heavy ZJ + Dana 30 = :boom:
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Old February 19th, 2008, 07:23 PM   #11
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Quote:
Originally Posted by Kodiak450r View Post
4.88 gear set has 39 on the ring and 8 on the pinion
5.38 gear set has 43 on the ring and 8 on the pinion...i'd go for the 5.38's if you really want a low crawl ratio. strength should not be an issue as far as R&P goes...i'd worry more about the spider gears and axle shafts or something else breaking.
As far as I am concerned, the R&P should be considered a weak point for the D30. If he is running 37s, he damn well should be running upgraded shafts, probably 30 spline shafts. When you get down to that few of teeth on the pinion it does become a concern. Go talk to any of the guys over at Mallcrawlin and they will all tell you the same thing.

Quote:
Originally Posted by Haggar View Post
As noted, there are 5.38s for Dana 30s, although not sure if the ZJ 30 will take them. They were of the CJ dana 30 type, no idea which of the several types of Dana 30 gears the ZJ uses.

But I agree, 37s + V8 + Heavy ZJ + Dana 30 = :boom:
...and I think that is ultimately what matters.
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