35s 5.38:1 and 42RLE - JeepForum.com
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post #1 of 47 Old 09-04-2018, 07:02 PM Thread Starter
BlaketheSnake
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35s 5.38:1 and 42RLE

If you are running this combo...35', 5.38:1, and 42RLE. How do you like it so far? I'm in the mountains of East TN and a lotta steep grades. My Jeep is a Dual Purpose and looking to go with 35s.


Thanks,

Blake


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post #2 of 47 Old 09-04-2018, 07:07 PM
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I have 4.88 with 32" tires and it is just barely bearable. When I had 35" tires it was challenging to climb a mountain on a daily basis and not hold up traffic.
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post #3 of 47 Old 09-04-2018, 07:13 PM
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Which direction would you go away from that? Personally, I'd probably go a bit deeper.
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post #4 of 47 Old 09-04-2018, 07:15 PM Thread Starter
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Quote:
Originally Posted by LimeLJ View Post
I have 4.88 with 32" tires and it is just barely bearable. When I had 35" tires it was challenging to climb a mountain on a daily basis and not hold up traffic.
That's why I'm looking into 5:38s.

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post #5 of 47 Old 09-04-2018, 07:59 PM
Jerry Bransford
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Quote:
Originally Posted by BlaketheSnake View Post
If you are running this combo...35', 5.38:1, and 42RLE. How do you like it so far? I'm in the mountains of East TN and a lotta steep grades. My Jeep is a Dual Purpose and looking to go with 35s.


Thanks,

Blake
Definitely go with 5.38. My TJ has 35's and the 42RLE and after regearing from the horrible 4.88 ratio to 5.38, the Jeep became fun again. It is much better on the highway, especially while climbing up & over my local mountains that surround me. I'm now at 2650 or so rpms at 70 mph and the mpg even went up from <12 mpg to 14.7 after the regearing. Love the 5.38's!

Here's my install thread... https://www.jeepforum.com/forum/f9/r...-38-a-4192298/
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post #6 of 47 Old 09-04-2018, 08:12 PM
popeyesides
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5.38's are the bare minimum for 35's with the 42RLE, If I had after market axles I would go even lower, like a 5.69. The .69 overdrive just is way too tall.

5.13's are great with 33's.
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post #7 of 47 Old 09-04-2018, 08:16 PM
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Originally Posted by popeyesides View Post
5.38's are the bare minimum for 35's with the 42RLE, If I had after market axles I would go even lower, like a 5.69. The .69 overdrive just is way too tall.

5.13's are great with 33's.
X2 on all that. If I could have gone lower than 5.38 I would have but I still felt fortunate to have had them them available for my D44 axles.
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post #8 of 47 Old 09-04-2018, 10:19 PM
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I have 5.38's in a D44 with the 42RLE and love the setup. I am currently running 33's but may eventually run 35's (after all the components that need beefing up get done). I will say it is the single best upgrade I have done to my rig so far.
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post #9 of 47 Old 09-05-2018, 06:01 AM
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Quote:
Originally Posted by Jerry Bransford View Post
X2 on all that. If I could have gone lower than 5.38 I would have but I still felt fortunate to have had them them available for my D44 axles.
Quote:
Originally Posted by popeyesides View Post
5.38's are the bare minimum for 35's with the 42RLE, If I had after market axles I would go even lower, like a 5.69. The .69 overdrive just is way too tall.

5.13's are great with 33's.
If 5.38 is the minimum for 35s, but even lower would be better; then why not suggest 5.38 for 33s? I'm curious about the thought process behind this.

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post #10 of 47 Old 09-05-2018, 08:10 AM
Jerry Bransford
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If 5.38 is the minimum for 35s, but even lower would be better; then why not suggest 5.38 for 33s? I'm curious about the thought process behind this.

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Not a bad idea, especially if someone lived at your altitude.

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post #11 of 47 Old 09-05-2018, 08:10 AM
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If 5.38 is the minimum for 35s, but even lower would be better; then why not suggest 5.38 for 33s? I'm curious about the thought process behind this.

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I never ran 33's with 5.38 just 5.13 but I am sure that would be a great combo too. Also there is not that much of a difference between the 5.13 to 5.38 with 35's but I am sure you would feel the difference with 33's.

Keep in mind that Jerry went from 4.88 to 5.38 and that is very noticeable, I went from 5.13 to 5.38 when I did locker swaps. And we both run 35's,
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post #12 of 47 Old 09-05-2018, 08:12 AM
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Not a bad idea, especially if someone lived at your altitude.
^^^^ agreed with altitude !!! I live at 2600 feet in the desert.
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post #13 of 47 Old 09-05-2018, 09:24 AM
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I love my 538's and 35's.

Around 2600 rpm's at 70 MPH.
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post #14 of 47 Old 09-05-2018, 10:01 AM
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The numbers are interesting and can be read different ways depending on how one feels about engine rpms.

42rle/32.5/4.88 = 2611rpm @ 75mph
42rle/32.5/5.13 = 2745rpm @ 75mph
42rle/32.5/5.38 = 2878rpm @ 75mph

42rle/34.5/4.88 = 2460rpm @ 75mph
42rle/34.5/5.13 = 2586rpm @ 75mph
42rle/34.5/5.38 = 2712rpm @ 75mph
42rle/34.5/5.69 = 2868rpm @ 75mph

Having watched these discussions for several years, there has been a growing shift in the recommendations since the relatively recent availability of 5.13 and 5.38 towards a lower gear/higher rpm. Once upon a time, 4.88 was the only choice for 35s on stock axles. That was the ceiling. Then it was generally assumed that each step down in tire size warranted the same respective step down in gear ratio option (4.56/33s, for example).

I can't help but wonder, in a world of no restrictions on gear ratios, if we would be recommending lower gears across the board. Is our thinking too much aligned with associating a step in tire size with a step in gearing; when in reality, we still are not going low enough with certain drivetrain options?

I mention the gearing on my daily driver often enough. I put my 75rpm at 3000rpm. I think it is great in the city, the highway and offroad. The usual response qualifies my choice by pointing out my elevation. While that certainly plays a role, I should point out more often than I do, that most people out here have not regeared the way I did. In fact, I was actively discouraged by the locals to not go as low as I did. Fortunately, when I was making my gearing decision, there were enough people on the forums commenting about the limitations of gear ratios for larger tires, that I started comparing numbers to inform my own situation. I do feel like our thinking has not fully caught up to our current options.

An FYI regarding the grimmjeeper calculations above, the tire sizes as entered are too large. The real world rpms would be a touch higher. I wanted to avoid an effective rolling circumference discussion. The concepts are the same regardless.
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Last edited by jjvw; 09-05-2018 at 11:28 AM. Reason: added ratios
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post #15 of 47 Old 09-05-2018, 11:16 AM
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4.0 engine + 42RLE transmission+ 5.38 axle ratio + 35" tires = great combination for an all purpose jeep regardless of altitude.
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