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Old 02-09-2011, 08:31 PM
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Regearing an auto I6

I've got an 04 inline 6 with the 42RLE auto. I've gathered that the preferred gearing for this set up is 4.88 if you have 33".

I have 31x10.50s on it and probably won't go much bigger since it's my daily driver. I've got stock gearing in it, either 3.07 or 3.73 (it's too cold out here for me to check). It's just not reaching the RPMs that it should be, and I don't want to be lugging the engine. So what would be the optimum gearing for 31s and the auto with overdrive?

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Old 02-09-2011, 08:32 PM
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Oh yeah. I've got the Dana 30 in the front. Dana 35 in the back. No lift.

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Old 02-09-2011, 08:34 PM   #3
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Old 02-09-2011, 08:41 PM   #4
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If you never plan to go bigger than 31", I'd go with 4.10 gearing.
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Old 02-09-2011, 08:47 PM
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Quote:
Originally Posted by TexasT
Chart has it at 4.11for daily driver So probably 4.10s would be easier to find. I know that the rubi comes with 4.10s but that's in a Dana 44. Can you put gears from a 44 in a 35? That's probably the dumbest question ever but I'm not super car savvy. I'm just thinking that I could find some cheap from someone with a rubi that regeared for larger tires or more power. But if it doesn't swap out then I'll have to find a good place to get some gears.
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Old 02-09-2011, 08:56 PM   #6
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No you can't.
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Old 02-09-2011, 08:56 PM   #7
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Nope, you can't use gears for a Dana 44 in a Dana 35c. And I wouldn't install used gears anyway since the cost savings would be inconsequential when the entire cost (which is mostly labor) is considered. Not to mention that some installers charge more for labor since setting up used gears is more difficult than setting up new gears.
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Old 02-09-2011, 09:04 PM
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Ok thanks. That's good to know so I don't waste my time looking. The install isn't really an issue for me. My stepfather is a master auto mechanic and he does installations. I just have to hold him back. He likes to live vicariously through my jeep. He's told me that if it was his he would put Dana 60s 38's and a whole host of other things I've never even heard of on it. But it's my daily driver and I have to keep things lower for my 5' fiancé. I've already had to put tube steps on it for her (which I wasn't super thrilled about, but she loves them. )
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Old 02-09-2011, 09:33 PM   #9
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Quote:
Originally Posted by Jerry Bransford
If you never plan to go bigger than 31", I'd go with 4.10 gearing.
I thought 4.88s were recommended for 31s on a 42RLE? Does it matter if its an LJ rather than a TJ? I have 3.73s and 31s that bog it down bad. My TJ with a 5spd and 3.73s is the total opposite, also 31s.

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