is 4.88 too much? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 13 Old 03-15-2014, 05:19 PM Thread Starter
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is 4.88 too much?

Just stole some 285 duratracs from work (660 out the door) and my current set up is 3.73, automatic, 3.8 liter slug, sport. MIGHT GO TO 35'S, but thatll be when its decommissioned to trail rig only. i need practical every day driver use of this jeep, highway, city split and i will be wheeling it a lot more than the average jk driver will be. sand dunes and rocks are my poison, so light use but not so light if you catch my drift. any suggestions, throw them my way, jeep on guys
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post #2 of 13 Old 03-15-2014, 05:55 PM
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I have 4.88 in a standard 3.8 liter unlimited with 35" bfg KM2 and love it.
I have enough power to move up to 37 is I wanted but it is fine with 35.

MPG isn't exactly pretty with 13 or so on highway and average of 11 in town.

hope that helps a bit.

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post #3 of 13 Old 03-15-2014, 06:05 PM
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I'm still running stock rubi 4.10's on 37 mtrk's. plan to go to 5.13's.
Lacks any kind of 1st take off power and 6th is useless on any sort of incline. (and 5th and 4th on steeper climbs)..

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post #4 of 13 Old 03-15-2014, 10:53 PM
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Running 5.38s on 35s (probably like 33-34s now), 3.8L, automatic, 4 door. I turn off overdrive around town if there's traffic. 4th gear is still a dog.

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post #5 of 13 Old 03-15-2014, 10:59 PM
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I have an 11 with 3.8 , 6 speed , 315/75/16`s and 4.88 gears . I did just over 300 miles today and with the combo of 80mph hwy and 60 mph rural rds my average was 19.1 mpg
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post #6 of 13 Old 03-16-2014, 12:58 AM
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3.8 + Auto + 33s or 35s and 4.88s will be just fine. A vast improvement over what you've got now.


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post #7 of 13 Old 03-16-2014, 08:52 AM
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Quote:
Originally Posted by RiverCityOffroad View Post
3.8 + Auto + 33s or 35s and 4.88s will be just fine. A vast improvement over what you've got now.
ok now, what about MPG, i know its a jeep and not looking for perfect MPG but Im a 3.8 07 X and from what im told its 3:10's I'm on 33s and 6th gear is a dogg! its a pain!!! but I'm not going up to 35's anytime soon.

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post #8 of 13 Old 03-16-2014, 08:56 AM
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is 4.88 too much?

Quote:
Originally Posted by MI JeepSkate View Post
Just stole some 285 duratracs from work (660 out the door) and my current set up is 3.73, automatic, 3.8 liter slug, sport. MIGHT GO TO 35'S, but thatll be when its decommissioned to trail rig only. i need practical every day driver use of this jeep, highway, city split and i will be wheeling it a lot more than the average jk driver will be. sand dunes and rocks are my poison, so light use but not so light if you catch my drift. any suggestions, throw them my way, jeep on guys

With an 07-11 automatic, if anything, 4.88s won't be enough. I'd do 5.13s with 33s and 5.38s with 35s or 37s, but 5.13s is the lowers gearing you can out in a Dana 30 front axle.

6 speed 07-11s have a completely different transmission ratio and don't need as low gearing.


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post #9 of 13 Old 03-16-2014, 01:36 PM
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I have those exact tires on my jeep, running the stock 3.73s. I didn't really notice a difference when going from stock, it's never had much pick up. Duratracs are a relatively light tire compared to many MTs, so that helps a little.

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post #10 of 13 Old 03-16-2014, 03:18 PM
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Try them. You might like them. Put the 285's on and run them for a while. If you hate them then regear.
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post #11 of 13 Old 03-16-2014, 05:00 PM
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Quote:
Originally Posted by RiverCityOffroad View Post
3.8 + Auto + 33s or 35s and 4.88s will be just fine. A vast improvement over what you've got now.
agreed.

I ran 37s with 4.88s behind a 4.3l and an od trans (4l60e). it was just about perfect for daily driving. granted the 4.3 definitely has more grunt than the gutless 3.8.

our jku is on 35s with the stock 4.10s and it's bearable. I won't be regearing since it's not necessary. maybe down the road when something needs replacement or breaks. I'll live with it being slow since I can hop into the d-max or s10 and have power.

the jku hunts for a lower gear all the time out on the hwy, even here in the flat lands of the Midwest.



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post #12 of 13 Old 03-16-2014, 07:33 PM
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If you ever plan on towing anything more than 50 pounds go with the 5.13's

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post #13 of 13 Old 03-17-2014, 08:17 AM
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Quote:
Originally Posted by RiverCityOffroad View Post
3.8 + Auto + 33s or 35s and 4.88s will be just fine. A vast improvement over what you've got now.
I was running 3.73s, Auto, in my '08. When I moved to 285s, I noticed a decline in performance. I had a hard time staying in OD on inclines and in headwinds (this on the hwy). On the trail it was fine.

If you had 4.10s, I'd say you'd be fine with 285s. But, when I went to 4.88s, I had no problems staying in OD on the hwy on inclines and headwinds with 285s. Same when I went 315/70r17s (34.50x12.50). IIRC at 70 mph I was at about 2300 rpm.

I moved up to 37s a year ago and it's bearable, but just barely IMO. I'm at ~14.0 mpg city/hwy driving and have trouble staying in OD at 70 mph. I can hold 60-65 pretty steady, I have trouble maintaining 70-75 on anything but flat roads with no headwind what-so-ever. Occasionally I hit 14.5 - 15.0 mpg when driving very conservatively (slow lane at about 60-65). IIRC when I was on 315s, I was getting about 17 mpg driving conservatively.

Hope this helps.

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