4.56 gears and 37s - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 10 Old 01-15-2020, 09:04 AM Thread Starter
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4.56 gears and 37s

Anybody here happy with their 4.56 gears and 37s? Could you post a video of your gauges from take off up to top speed? Just want to see how the auto tranny goes through the gears

Thanks!!

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post #2 of 10 Old 01-15-2020, 02:23 PM
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Originally Posted by libordemise View Post
Anybody here happy with their 4.56 gears and 37s? Could you post a video of your gauges from take off up to top speed? Just want to see how the auto tranny goes through the gears

Thanks!!

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So, we've narrowed your inquiry down to automatics, but 3.8L or 3.6L engine?

That makes a huge difference (mostly because the auto. transmission ratios changed from horrible to good).

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post #3 of 10 Old 01-15-2020, 02:27 PM Thread Starter
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Good point. 3.6

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post #4 of 10 Old 01-17-2020, 06:14 PM
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I have it. I cant do videos. But I love it. My mpg says 15.2 mpg when I feather the gas pedal



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post #5 of 10 Old 01-21-2020, 09:14 AM
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4.56 gears and 37s

When I started my mods, I knewthat I would never go above 35 tires.

Yea rite.

2017 JKUR 3.6 auto transmission

Anyway I re-geared to 4:56.
At the time I was daily driving it, I do a lot of highway driving and tend to run 75 when the limit is 70.

Skip ahead a few good wheeling trips.
My old 2000 F250 4x4 7.3 needed tires. I said to myself this is a perfect time to put 37s on the JK, the 35 Nittos still had a ton of life in them, they went on the truck and I put 37s on the Jeep assuming that Id need to stash some cash to make the jump to 4:88s

What I ultimately found, and was pleased about is.

At highway speeds 55- (cringe)80, my RPMs dropped just enough that the JK didnt seem to be wound up as much.

These are close but not exact numbers.

4:56 @ 80 MPH = 2950-3000 RPMs (35 Nitto Trail grapplers.)

With the 37 Trail Grapplers Im running closer to 2750-2850 RPMs @ 80mph. (Again I cringe) I dont like to think about running that fast but frequently find myself doing so on Texas Highways with low traffic in the area.

I found no significant drop in fuel mileage, Im sure it dropped some but it wasnt huge and my wallet didnt feel it. If it was significant my wallet would have noticed because its hungry all the time.

The best part was, I noticed no drop off in (off road) performance. I wheel exclusively in 4Lo.
Im guessing the difference would be more noticed in 4hi if I used that.

Bottom line is, Im personally (perfectly)happy with the 4:56s and the Nitto 37s. Im mentioning Nitto because they do run closer to 36 mounted and aired up. Other brands may run truer to size, an actual 37 tall tire may have different end results.

Im away from home at the moment, and in my truck. Ill try to make a little video for you (on road) when I get home.

Edit:
I also have reset all parameters with SuperChips tuner. My rig shifts flawlessly.

Last edited by Pmedic920; 01-21-2020 at 09:29 AM.
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post #6 of 10 Old 01-24-2020, 05:55 PM Thread Starter
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Quote:
Originally Posted by Pmedic920 View Post
When I started my mods, I knewthat I would never go above 35 tires.

Yea rite.

2017 JKUR 3.6 auto transmission

Anyway I re-geared to 4:56.
At the time I was daily driving it, I do a lot of highway driving and tend to run 75 when the limit is 70.

Skip ahead a few good wheeling trips.
My old 2000 F250 4x4 7.3 needed tires. I said to myself this is a perfect time to put 37s on the JK, the 35 Nittos still had a ton of life in them, they went on the truck and I put 37s on the Jeep assuming that Id need to stash some cash to make the jump to 4:88s

What I ultimately found, and was pleased about is.

At highway speeds 55- (cringe)80, my RPMs dropped just enough that the JK didnt seem to be wound up as much.

These are close but not exact numbers.

4:56 @ 80 MPH = 2950-3000 RPMs (35 Nitto Trail grapplers.)

With the 37 Trail Grapplers Im running closer to 2750-2850 RPMs @ 80mph. (Again I cringe) I dont like to think about running that fast but frequently find myself doing so on Texas Highways with low traffic in the area.

I found no significant drop in fuel mileage, Im sure it dropped some but it wasnt huge and my wallet didnt feel it. If it was significant my wallet would have noticed because its hungry all the time.

The best part was, I noticed no drop off in (off road) performance. I wheel exclusively in 4Lo.
Im guessing the difference would be more noticed in 4hi if I used that.

Bottom line is, Im personally (perfectly)happy with the 4:56s and the Nitto 37s. Im mentioning Nitto because they do run closer to 36 mounted and aired up. Other brands may run truer to size, an actual 37 tall tire may have different end results.

Im away from home at the moment, and in my truck. Ill try to make a little video for you (on road) when I get home.

Edit:
I also have reset all parameters with SuperChips tuner. My rig shifts flawlessly.
Any luck with that video? My tranny is a little finicky still on any incline. Will stay in 2nd at 3000revs and just not shift sometimes. I have to hit the shifter.

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post #7 of 10 Old 01-24-2020, 06:33 PM
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Quote:
Originally Posted by libordemise View Post
Any luck with that video? My tranny is a little finicky still on any incline. Will stay in 2nd at 3000revs and just not shift sometimes. I have to hit the shifter.

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post #8 of 10 Old 01-25-2020, 12:15 PM
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Originally Posted by libordemise View Post
Any luck with that video? My tranny is a little finicky still on any incline. Will stay in 2nd at 3000revs and just not shift sometimes. I have to hit the shifter.

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Check your PMS
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post #9 of 10 Old 01-25-2020, 12:41 PM Thread Starter
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Check your PMS
We're good. Just a little bit of blood still in there.

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post #10 of 10 Old 01-25-2020, 12:42 PM Thread Starter
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Hahaha just kidding

I'll text ya in a little bit. Thanks for taking the time

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