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post #1 of 22 Old 06-16-2011, 09:42 AM Thread Starter
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Recommend gears for me!

I've got an 08 unlimited X no tow package 6 speed so I'm pretty sure I've got the 3.21s and now that I own a sweet boat it really sucks towing and it actually sucks altogether. I'm about to leave my JK to my brother in law while I finish up my deployment in Afghanistan and while I'm gone I'm hoping to get some new gears put in. I was thinking 4.88s because I don't think I'm gonna go any bigger than the 33s I have now and don't wanna lose any gas mileage on the interstate because I'm on it alot on the weekends while I'm stateside.

I know theres a great chart out there somewhere to help me on gear ratio/tire size but I wanna know from some real world subject matter experts and what they think I should do in my situation. Any and all answers are appreciated!!!

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post #2 of 22 Old 06-16-2011, 09:58 AM
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depending on the amount of tow you're going to do, i'd look for people in your area who have different gearing.

if your towing less then 5% a month, i'd get 4:88's and you should be good with 33s.

if your towing more then 5% a month i'd prolly get 513s.

I got an auto with 37's and 513's and i wish i went with 538s

also depending on how much you tow, i'd look into a transmission cooler, even with the standard transmission.


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post #3 of 22 Old 06-16-2011, 11:31 AM
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4.88's would be too much for your 33's. I'd do 4.56 if I were you. If you had said you were going to run 35's then I'd recommend 4.88's. I have 4.88's and 35's on my 6 speed and the RPM's run really high on the highway (speed limit is 75 out here). At 75 I'm at about 3200 RPM's and that's hurting my fuel economy.

Sometimes I wish I would have gone 4.56 even with my 35's because I spend so much time on the highway at high speeds. 4.56 would be great for 33's and even give you the option of going to 35's in the future.
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post #4 of 22 Old 06-16-2011, 11:34 AM
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33s and a 6spd=4.56, just do 35s and 4.88s at the same time!


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post #5 of 22 Old 06-16-2011, 11:36 AM
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Yea, with 33's, I don't think I'd go any higher than 4.56. I'm 4.88 w/6 speed and 35's and it does zing on the highway above 70.

As for mileage, I lost on average 1.5 mpg going from 3.21 to 4.88 - just FYI

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post #6 of 22 Old 06-24-2011, 04:41 AM Thread Starter
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Thanks for the input fellas, looks like I'll be looking alot more closely at any future tire upgrades although unlikely. 4.56s sounds like they'll be my answer! Thanks again for the input. As for having a 6spd, would I have to use a programmer at all after the install? I would need to redo the speedometer wouldn't I? Sry not real savvy on the gear thing thanks again guys

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post #7 of 22 Old 06-24-2011, 07:09 AM
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You've got the 4dr brick-You should only have to do a regear ONCE--


Quote:
Originally Posted by dodge8604 View Post
Thanks for the input fellas, looks like I'll be looking alot more closely at any future tire upgrades although unlikely. 4.56s sounds like they'll be my answer! Thanks again for the input. As for having a 6spd, would I have to use a programmer at all after the install? I would need to redo the speedometer wouldn't I? Sry not real savvy on the gear thing thanks again guys
Since you have a 6spd-4.56 is a total waste, if you start with 33" tires, you still won't be able to use your O/D-

Get a set of 5.13s YUKON gears (complete) have put in then you can tow/off-road/cruise at 65/70 in O/D and get good mileage, then discover what really can happen in 4lo, for climbing-off-road or pulling a boat outta the water in 2wd 1st--

I'd suggest "lubelocker" gaskets /w YUKON gears-

Good luck

JIMBO


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post #8 of 22 Old 06-24-2011, 07:35 AM
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Quote:
Originally Posted by JIMBOX View Post
You've got the 4dr brick-You should only have to do a regear ONCE--




Since you have a 6spd-4.56 is a total waste, if you start with 33" tires, you still won't be able to use your O/D-

Get a set of 5.13s YUKON gears (complete) have put in then you can tow/off-road/cruise at 65/70 in O/D and get good mileage, then discover what really can happen in 4lo, for climbing-off-road or pulling a boat outta the water in 2wd 1st--

I'd suggest "lubelocker" gaskets /w YUKON gears-

Good luck

JIMBO
i think you misread. the 6 speed is a manual. in 6th with 5.13's and 33's it's going to be SCREAMING down the highway lol.

31 jeeps in... still have issues
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post #9 of 22 Old 06-24-2011, 07:54 AM
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Heh Heh, Nope no misread-what do you think the 6th gear is ???


Quote:
Originally Posted by 2k2wranglerx View Post
i think you misread. the 6 speed is a manual. in 6th with 5.13's and 33's it's going to be SCREAMING down the highway lol.
O/D and 5.13s are only about 500 rpm higher than 3.73s--I have 5.38s and My '08 JKUR is, with 33.6" tire, is at 2650rpm/70mph, but gets the best mileage at 60 mph-2250 rpm (19mpg)-

It's a jungle out there

JIMBO


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post #10 of 22 Old 06-24-2011, 08:02 AM
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Quote:
Originally Posted by JIMBOX View Post
Heh Heh, Nope no misread-what do you think the 6th gear is ???




O/D and 5.13s are only about 500 rpm higher than 3.73s--I have 5.38s and My '08 JKUR is, with 33.6" tire, is at 2650rpm/70mph, but gets the best mileage at 60 mph-2250 rpm (19mpg)-

It's a jungle out there

JIMBO

You must have an automatic. HUGE difference between manual O/D and automatic O/D. I have 4.88's with 35's and I'm turning 2800'ish RPM's @ 70 in 6th gear.

Chuck
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post #11 of 22 Old 06-24-2011, 08:02 AM
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Quote:
Originally Posted by JIMBOX View Post
Heh Heh, Nope no misread-what do you think the 6th gear is ???




O/D and 5.13s are only about 500 rpm higher than 3.73s--I have 5.38s and My '08 JKUR is, with 33.6" tire, is at 2650rpm/70mph, but gets the best mileage at 60 mph-2250 rpm (19mpg)-

It's a jungle out there

JIMBO
if you say so


31 jeeps in... still have issues
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post #12 of 22 Old 06-24-2011, 08:07 AM
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Quote:
Originally Posted by dodge8604 View Post
Thanks for the input fellas, looks like I'll be looking alot more closely at any future tire upgrades although unlikely. 4.56s sounds like they'll be my answer! Thanks again for the input. As for having a 6spd, would I have to use a programmer at all after the install? I would need to redo the speedometer wouldn't I? Sry not real savvy on the gear thing thanks again guys
http://www.4wheelparts.com/Performan...n=EXPPC52001-1

This will most likely be one of your cheapest options as far as recalibration. Dealerships can flash as high as 32" tires and 4.10 gears, unless that has changed in the recent years.


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post #13 of 22 Old 06-24-2011, 08:12 AM
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Quote:
Originally Posted by JIMBOX View Post
Heh Heh, Nope no misread-what do you think the 6th gear is ???




O/D and 5.13s are only about 500 rpm higher than 3.73s--I have 5.38s and My '08 JKUR is, with 33.6" tire, is at 2650rpm/70mph, but gets the best mileage at 60 mph-2250 rpm (19mpg)-

It's a jungle out there

JIMBO
Sorry man, 6th gear s not "od"...it's 6th gear...your numbers with an auto trans will be completely different than a manual trans.

Stick with going 4.56, anything else will be screaming on the highway with 33" tires


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post #14 of 22 Old 06-24-2011, 08:23 AM
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OK, if thats what you guys want then so beit-but


Quote:
Originally Posted by blownJK View Post
Sorry man, 6th gear s not "od"...it's 6th gear...your numbers with an auto trans will be completely different than a manual trans.

Stick with going 4.56, anything else will be screaming on the highway with 33" tires
I have a 4spd auto-4th gear is O/D-

He has a 6spd manual-6th spd is O/D

You're right if his jeep is a daily driver, although theres an an awful lotta guys that DIDN"T change to the 5.13s and are really sorry-

Lets hear from the UNHAPPY 5.13 gear drivers !!

I'm not arguing-My 5.38s are the single best mod I've done to my JKUR-

All we can do is show the OP some opinions-not argue--RIGHT !!

Ciao

JIMBO


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post #15 of 22 Old 06-24-2011, 08:57 AM
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Manual Transmission Ratios for the JK's NSG370:
1st - 4.46
2nd - 2.61
3rd - 1.72
4th - 1.25
5th - 1.00
6th - 0.84

Auto Transmission Ratios for the JK's 42re:
1st - 2.740
2nd - 1.540
3rd - 1.000
4th - 0.690

Forthcoming 545rfe Auto Transmission Ratios for the 2012 JK's:
1st - 3.00
2nd - 1.67/1.50 - two ratios, the shorter when upshifting and the taller when downshifting, iirc.
3rd - 1.00
4th - 0.75
5th - 0.50 - but I have also read 0.67, which may be for pre-'08 trannys.

With the much steeper O/D the autos need lower gears than the manual, which is pretty common knowledge.

JPK

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post #16 of 22 Old 06-24-2011, 09:04 AM
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Quote:
Originally Posted by drgreybow View Post
4.88's would be too much for your 33's. I'd do 4.56 if I were you. If you had said you were going to run 35's then I'd recommend 4.88's. I have 4.88's and 35's on my 6 speed and the RPM's run really high on the highway (speed limit is 75 out here). At 75 I'm at about 3200 RPM's and that's hurting my fuel economy.

Sometimes I wish I would have gone 4.56 even with my 35's because I spend so much time on the highway at high speeds. 4.56 would be great for 33's and even give you the option of going to 35's in the future.
This is exactly why my I want to go with 4.56's when I lift and put small 35's (duractracs) on my rig. If I was making a wheeling rig, I'd put 5.13's and not look back. But I spend way to much time on road driving and limited to any on the trail. I reserve the trails for my quad.
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post #17 of 22 Old 06-24-2011, 09:14 AM
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I concede-but


Quote:
Originally Posted by Koko View Post
This is exactly why my I want to go with 4.56's when I lift and put small 35's (duractracs) on my rig. If I was making a wheeling rig, I'd put 5.13's and not look back. But I spend way to much time on road driving and limited to any on the trail. I reserve the trails for my quad.
Thanx JPK, for the exact figures-but Ya gotta think if you're gonna run your jeep every day at 75/80 mph, then there's no doubt !!

Ciao

JIMBO


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post #18 of 22 Old 06-24-2011, 05:19 PM
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5.13's on 37's and love it! cant wait to go to 5.38's when the d60's come into the picture!

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post #19 of 22 Old 06-24-2011, 05:36 PM
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I'm turning 2750 RPM on the highway in 6th at 75 with 4.88s and 37s. I would not go above 4.88s if you plan on staying with 33s.

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post #20 of 22 Old 06-24-2011, 06:29 PM
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i have an 08 no tow and had 3:73..easier if you do id vote 5:13 or 5:38

i want 5:38 in my auto 35.13.50 might go to 37 or 40 in future.. what's your guys opinion? sorry for the jack


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post #21 of 22 Old 06-24-2011, 06:39 PM
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I have 6.00s and 40s should be perfect


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post #22 of 22 Old 06-24-2011, 06:44 PM
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I have 6.00s and 40s should be perfect


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