2.4L I4, auto, 4.56 gears, 42rle. can it handle 31x10.5's? - Page 2 - JeepForum.com
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Unread 08-03-2010, 05:19 PM   #16
AFjeepMan
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alright well that works, but remember, it's not going to be great. However, I wasn't sure how I'd like my tires either, but after a week or so of getting used to the way it drove I learned that a little more skinny pedal when coming up on a hill made a big difference, and now I love my setup, as much as anyone can love an auto for a DD when they really want a 5 or 6 speed.

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WANTED: SYE and cv shaft...good condition and good price. for a TJ with about 5-6" of lift.
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Unread 08-03-2010, 05:39 PM   #17
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Quote:
Originally Posted by AFjeepMan View Post
Why does everyone hate their 42RLE's?
Where have you been? This has been discussed a ton. The 42rle was an afterthought to the Jeep engineers. It's geared poorly with widely spaced ratios and has an overly tall OD. Every single 42rle-equipped TJ from the factory was not geared low enough.

Let's run some numbers:

27" tires/42rle @ 65mph in OD: 2545 RPM--that's actually a bit low for the 4 banger. At that speed, it needs to be in the 2800 RPM area to be in its powerband.

31" tires/42rle @ 65mph in OD: 2217 RPM--way too low. Turn the OD off and you're at 3200 RPM.

Let's compare that to the factory 4.10 gears and NV-2500 in the 04 4 banger TJ:
27" tires @ 65mph in OD: 2660
31" tires @ 65mph in OD: 2317

And for the lucky few who got the NSG370 with the 4 banger:
27" tires @ 65mph in OD: 2793 RPM
31" tires @ 65mph in OD: 2433 RPM

So, even with higher gearing, the manual-equipped Jeep will run at higher RPM's. The 42rle makes the 4.0 work harder than needed and I just can't imagine it behind a 4 banger. Poor decision on Jeep's end.

OP, after running the numbers I wouldn't recommend 31's since you're way too low in OD and too high with OD off. I think 33's would be perfect for you as long as you don't mind just keeping OD off. That would put you at 3k RPM @ 65mph, just right for the 4 banger at that speed with that size tire.
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Unread 08-03-2010, 05:44 PM   #18
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33's? Really? I could care less about O/D, I didn't buy the Jeep for its sweet mileage numbers. I guess I just had a hard time wrapping my head around the fact that if 31's wouldn't work, how in the world would I make 33's work? It makes a little more sense now. A little, not perfect sense quite yet.
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Unread 08-03-2010, 06:00 PM   #19
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Quote:
Originally Posted by monkeygruven View Post
33's? Really? I could care less about O/D, I didn't buy the Jeep for its sweet mileage numbers. I guess I just had a hard time wrapping my head around the fact that if 31's wouldn't work, how in the world would I make 33's work? It makes a little more sense now. A little, not perfect sense quite yet.
It's all about keeping your engine in its powerband. That will produce better mileage and overall performance. Running 31's and keeping the OD on will put you out of your powerband, yielding WORSE fuel mileage. I told you exactly why 33's 'could' work better than 31's. With 31's, you're in an odd spot--RPM's are too low with OD on and too high with OD off. With 33's, obviously you don't want OD on but with OD off, you're at the right spot. You'll essentially be running a 3 speed auto with no OD. With that, you would probably get better mileage with 33's than with 31's.

31" tires/42rle @ 65mph in OD: 2217 RPM--way too low. Turn the OD off and you're at 3200 RPM's....too high.

33" tires/42rle @ 65mph in OD: 2082 RPM--WAY too low. Turn the OD off and you're at 3018 RPM's....about right.

Is any of that not clear?
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Unread 08-03-2010, 06:07 PM   #20
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well if you run 33's you really can expect to never use OD, but it will bring the rpms out of od down to a reasonable 3k. Honestly if you like to be able to accelerate on the highway I would stick with the 31's, maybe 32's. But expect for a lot of back and forth in and out of OD. I don't really have it, and I wish I had 4.56's...wanna swap for my 3.73's? haha
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Unread 08-03-2010, 06:08 PM   #21
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It makes sense, that's what I was saying. Thank you for the numbers, I guess I had just never plugged in the numbers for 33's, because I thought, "Well, if 31's would barely work, how could 33's?" It's just a little clearer now, so thanks dude!

On another note, I just wish there were more 42rle/2.4 owners out there with a little experience on this. It's hard being the mystery Jeep, and it could get real expensive real quick to just experiment.
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Unread 08-03-2010, 06:10 PM   #22
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there are more 2.4l 42rle owners, but very few who have 4.56's...that is honestly a stock setup I have never seen! Wish I could find those gears in a junk yard for my jeep!
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WANTED: SYE and cv shaft...good condition and good price. for a TJ with about 5-6" of lift.
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Unread 08-03-2010, 06:14 PM   #23
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The 4.56 were only stock in 2004 with the 2.4 and 42rle. I guess I got "lucky", but it really is pretty well paired, which doesn't say much for the 42rle. I'm kind of screwed, cause if i regeared, I could only go to 4.88 with the D30/35 combo.
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Unread 08-03-2010, 06:15 PM   #24
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Imped, any thoughts on downshifting to to accelerate in second with 33's and OD off all the time?
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Unread 08-03-2010, 06:31 PM   #25
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As long as OD is off, I don't think you will have ANY problems running 33's. It will be similar to any of the other guys running 33's on 4 bangers. It's the OD that would kill you. Keep that off and you're golden.
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Unread 08-03-2010, 06:33 PM   #26
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Right on! I feel like it's Christmas. You just made my day, Imped. Thanks, man!
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Unread 08-03-2010, 07:05 PM   #27
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Imped made your day? what about me for suggesting it?
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Unread 08-03-2010, 07:10 PM   #28
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Big thanks to both of ya'll!
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Originally posted by MotoSoul:

The real trail rated badges are located on your skid plates.
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Unread 12-15-2010, 11:56 AM   #29
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Quote:
Originally Posted by monkeygruven View Post
The 4.56 were only stock in 2004 with the 2.4 and 42rle. I guess I got "lucky", but it really is pretty well paired, which doesn't say much for the 42rle. I'm kind of screwed, cause if i regeared, I could only go to 4.88 with the D30/35 combo.
2003 ALSO CAME WITH 4.56 BUILD SHEET BELOW
hank you for contacting the Jeep Customer Assistance
> Center regarding a
> build sheet for your 2003 Jeep Wrangler.
>
> We are pleased to provide vehicle build information per
> your request.
>
> According to our records, your vehicle was equipped from
> the factory
> with the following:
>
> Sales Code Description
> *P5 Cloth High-Back Bucket Seats
> -J3 Khaki
> ADC Convenience Group
> APAS Monotone Paint
> A48P 2.4L Eng(ED1)/4Spd A/T 42RLE(DG6)
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Unread 12-16-2010, 03:22 PM   #30
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I'm still saving for tires, so stay tuned out there if you have the 2.4/42rle combo!
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Originally posted by MotoSoul:

The real trail rated badges are located on your skid plates.
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