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Topic Review (Newest First)
12-27-2012 04:38 PM
JeepHerz
Quote:
Originally Posted by sjchoueiry View Post
lol
The MPG loss did not bother me much considering that it is my daily drive and it is only 4 miles each way.
Most of the mileage I put on is due to the long drives (about 2 hrs each way) to go on trail runs. I live in West LA and it is quite a distance whether I go to BB or up north near Mojave, but it is worth it.
Joe.
Agreed. It is a Jeep after all. I just keep hitting the "step" button so I don't have to see the MPG. Everynow and then I drive the freeway and I get all optimistic and check.
(Step! Step!)
Ignorance is bliss.
12-27-2012 04:29 PM
sjchoueiry
Quote:
Originally Posted by JeepHerz View Post
More MPG loss? I'll have to order Jerry cans so I can make the 2 mile drive to work.
lol
The MPG loss did not bother me much considering that it is my daily drive and it is only 4 miles each way.
Most of the mileage I put on is due to the long drives (about 2 hrs each way) to go on trail runs. I live in West LA and it is quite a distance whether I go to BB or up north near Mojave, but it is worth it.
Joe.
12-27-2012 03:33 PM
JeepHerz
Quote:
Originally Posted by sjchoueiry View Post
That's a great idea Jen.
You will definitely notice a difference between the gears. The car will run smoother at the higher numerical gear. There is however as expected a loss of mpg.
Please note when using the calculator the difference between the TC gears for the Rubicon and the sport models.

Good luck with yours and enjoy it.

See you on the next run.

Joe.
More MPG loss? I'll have to order Jerry cans so I can make the 2 mile drive to work.
12-27-2012 03:18 PM
sjchoueiry
Quote:
Originally Posted by JeepHerz View Post
HI Joe!
I figured we'd met- your Jeep looked familiar but I couldn't place the forum ID. For all future runs I am bringing custom name tags:
"Hi! My name is...
My forum name is..."

Thanks for the gear calculator. I hadn't seen that. I'll have to tinker.
Good to know you are okay with 4.88s. I just need to get on the freeway and try putting it in 4th at 70. That should jack up my RPMs and give me an idea if the higher RPMs will bother me. Unfortunately my Jeep is currently under construction so it will have to wait.
Thanks all!
That's a great idea Jen.
You will definitely notice a difference between the gears. The car will run smoother at the higher numerical gear. There is however as expected a loss of mpg.
Please note when using the calculator the difference between the TC gears for the Rubicon and the sport models.

Good luck with yours and enjoy it.

See you on the next run.

Joe.
12-27-2012 01:29 PM
JeepHerz
Quote:
Originally Posted by sjchoueiry View Post
Jen, we already met twice. Once on 2N17X run when buck flipped and once on Cleghorn run not long ago. I have the white JK Unlimited with a roof rack.
When I was still running the 3.21 it needed more power to keep it going and crawling and especially going uphills on freeways. The 4.88 works great in all conditions. Performance a lot better. Do not have to be heavy on the gas for pick-up or going over rocks. My RPM is within the range that the charts say for the 4.88 with 35" tires.
Here is a link for gear ratio calculator that you can use to find out the info you need for different gears, tire sizes, TC gear, etc.
Gear Ratio Calculator

I have done a comparison run for the Rubicon and Non-Rubicon (Sport) see attached file.

I hope this helps and hope to see you again soon on the trails.

Joe.
HI Joe!
I figured we'd met- your Jeep looked familiar but I couldn't place the forum ID. For all future runs I am bringing custom name tags:
"Hi! My name is...
My forum name is..."

Thanks for the gear calculator. I hadn't seen that. I'll have to tinker.
Good to know you are okay with 4.88s. I just need to get on the freeway and try putting it in 4th at 70. That should jack up my RPMs and give me an idea if the higher RPMs will bother me. Unfortunately my Jeep is currently under construction so it will have to wait.
Thanks all!
12-27-2012 11:01 AM
COStrider
Quote:
Originally Posted by Mig888
I have a 2012 JKU with 35" tires and automatic transmission. I have the 3.73 gears and I am very happy with it. Here is a link to the picture of my Jeep (sorry, having difficulty posting the picture directly in the thread). http://i.imgur.com/bgszQ.jpg
Sweet rig
12-27-2012 10:29 AM
sjchoueiry
Quote:
Originally Posted by JeepHerz View Post
SO how are the 4.88s? Specifically 70 and around 40mph? Very interested. I am leaning towards 4.56s. I am concerned that freeway would be 2700 RPMS or above and that seems a little high for me. But I'll do just about anything to fix the 40MPH lug. I drive 80% city.
You're in LA right? If we're ever on a trail together I'd love to compare notes.
Jen, we already met twice. Once on 2N17X run when buck flipped and once on Cleghorn run not long ago. I have the white JK Unlimited with a roof rack.
When I was still running the 3.21 it needed more power to keep it going and crawling and especially going uphills on freeways. The 4.88 works great in all conditions. Performance a lot better. Do not have to be heavy on the gas for pick-up or going over rocks. My RPM is within the range that the charts say for the 4.88 with 35" tires.
Here is a link for gear ratio calculator that you can use to find out the info you need for different gears, tire sizes, TC gear, etc.
Gear Ratio Calculator

I have done a comparison run for the Rubicon and Non-Rubicon (Sport) see attached file.

I hope this helps and hope to see you again soon on the trails.

Joe.
12-25-2012 11:16 PM
JeepHerz
Quote:
Originally Posted by JPi1 View Post
Sorry about that Jen, what I left out is this customer is going to 37s next, so we installed 4.88s so the tach will read about 2400. Otherwise, I would have put in 4.56s
Ah...that makes sense. Happy to hear that since Santa just brought me 4.56s. Santa rocks. Now the piggy bank needs to recover so I can get a rear locker. A wise man once said all I need is rear lockers so that'll do. For now.
12-25-2012 01:54 AM
Cfry Haha well guess that explains that I wouldnt know Much about crawling. I am 2 seconds away from the beach. Dont listen to me on that subject
12-25-2012 01:51 AM
Cfry Sorry for the 3rd post. Nevermind I have 4.10s. I asked my buddy that installed my new lift.
12-25-2012 01:46 AM
Cfry To add also my,rubi has triptronic so if I nees a lower gear I can change it. Seems suitable for east coast offroad, and beach. Wouldnt think it would work good for crawling though
12-25-2012 01:40 AM
Cfry According to my build chart I have 373s. I have an auto. Im pretty sure only the manual has 410s unless you order 373s
12-24-2012 11:04 PM
JPi1
Quote:
Originally Posted by JeepHerz

So confused. The chart says you'd be 300-400 RPMs higher than that. Were you sampling the egg nog a little early maybe? Or is it possible that some random chart someone found on the internet (and was then re-posted) could be wrong? Everything on the internet is right, right?
Sorry about that Jen, what I left out is this customer is going to 37s next, so we installed 4.88s so the tach will read about 2400. Otherwise, I would have put in 4.56s
12-24-2012 10:39 PM
JeepHerz
Quote:
Originally Posted by JPi1 View Post
I have a 12 Rubicon auto with 4.10 gearing factory, 4" lift and 35x12.50x15 Goodyear MTRs, and have no plans to gear it unless I go to 37"s. the 3.6 power buries the issues the 3.8s had with gearing. It's great on the freeway. We just geared a 12 for a customer that is running the same setup as my wife's 12 above, with the exception of his 3.73 gears. We went with 4.88s, and its about 2400 rpm at 70.
So confused. The chart says you'd be 300-400 RPMs higher than that. Were you sampling the egg nog a little early maybe? Or is it possible that some random chart someone found on the internet (and was then re-posted) could be wrong? Everything on the internet is right, right?
12-24-2012 10:32 PM
JPi1
Quote:
Originally Posted by DOZICON

This looks more like a hold my beer and watch this moment!!
Looks like he needs some work on his jeeps articulation, maybe more droop in the rear!
12-24-2012 10:21 PM
JeepHerz Funny if you read the quote under the photo. Before the lift & tire install. (KM2s by the way).
"Hopefully I'll be good with 3.21s"s....
Um....no.
I have a 2012 rubicon 3inch teraflex with fox shocks and 35s never changed gears and have lots of power still. I might get 37s next
Cfry- do you have 4.10s or 3.73s?
12-24-2012 10:12 PM
DOZICON
Quote:
Originally Posted by pluke the 2 View Post
2012, 410's, 37's, automatic, no issues.

Quote:
Originally Posted by JeepHerz View Post
Pluke: couldn't find a rock to climb? . Found a bumper sticker for that very moment " Buckle Up. I want to try something."
Thanks all. As JKUs I think you all have 3.73 gears stock. Hopefully with a lighter vehicle and no hard top I'll be good even with 3.21. Still might trade my Toyos for much lighter KM2s.
The lift has arrived- we'll know in a couple of weeks. Thanks!

This looks more like a hold my beer and watch this moment!!
12-24-2012 09:30 PM
Cfry I have a 2012 rubicon 3inch teraflex with fox shocks and 35s never changed gears and have lots of power still. I might get 37s next
12-24-2012 09:22 PM
JPi1 I have a 12 Rubicon auto with 4.10 gearing factory, 4" lift and 35x12.50x15 Goodyear MTRs, and have no plans to gear it unless I go to 37"s. the 3.6 power buries the issues the 3.8s had with gearing. It's great on the freeway. We just geared a 12 for a customer that is running the same setup as my wife's 12 above, with the exception of his 3.73 gears. We went with 4.88s, and its about 2400 rpm at 70.
12-24-2012 08:52 PM
BeyondYourFrontDoor I have 35's on my 09 Rubi... 4.10 gears of course... 6 speed... I find it marginal at low speed in first gear... you really can't putt putt unless you are in low. Now, you've got 8- more HP than me, so that might make up the difference.

For me... I wouldn't go lower than 4.10...
12-24-2012 01:19 PM
mflint1513
Quote:
Originally Posted by JeepHerz
Hi JK'ers-
If you've got the above equipment- did you need to replace the gears? If so- to what (4.56, 4.88?) Looking for someone with a 2012 JK since the tranny and engine are different from prior years. Also since Rubi's & JKUs have different gears and weight ratios.
I have the 3" Mopar/Terraflex lift in transit. But after receiving my new 305/12.5/17 Toyo MTs & wheels - I am freaking out that I've added too much weight and that I'll lose a ton of torque. I have the standard 3.21 gears and an automatic tranny. Since I am female I am not the most patient of human beings I don't want to wait until after doing the lift to find out I should've replaced the gearing.

I found the "Gear Ratio Question" thread which was very helpful (thanks MTH for the chart). I get the differences- just want to know how the standard 3.21 gears did with the modifications. And if I need to make MORE mods.

Thanks in advance and sorry for another lift post. Just couldn't find a post-er without a Rubicon or Unlimited.
Just regeared my '12 manual with 35s from 3.73 to 4.56. It's great at 40...feels like a tank. Not that I've driven one yet but whatever. I also like it a lot more at 70+. I'm looking forward to drivin up 15 through the pass to see if it handles the hills on the highway better.
12-24-2012 12:31 PM
JeepHerz
Quote:
Originally Posted by sjchoueiry View Post
I'm sorry I am late to this. I do have a 2012 JK Unlimited sport automatic trans and hard top. Got it stock with 3.21 and 32" tires (24S package). I since changed front bumper with winch, 4" lift with 35" tires, and side rock crawlers. I went rock crawling on a few trails rated difficult in the last few months and the jeep performed like a charm. You do however need to get the AEV ProCal module to set the ECM (car computer) for the 35" tires. This helps in performance otherwise your ride will be sluggish. Today I just got my car regeared to 4.88. Of course you need to use the AEV ProCal to program your car computer for the 4.88 gear. I can hardly wait to go rock crawling with the new gears. I am pretty sure that there will be quite an improvement over the 3.21.

I hope this helps.
SO how are the 4.88s? Specifically 70 and around 40mph? Very interested. I am leaning towards 4.56s. I am concerned that freeway would be 2700 RPMS or above and that seems a little high for me. But I'll do just about anything to fix the 40MPH lug. I drive 80% city.
You're in LA right? If we're ever on a trail together I'd love to compare notes.
12-24-2012 12:23 PM
Jpdst29
Quote:
Originally Posted by Con Artist View Post
Actually, I've never heard of them, but thanks for the tip! Will check'em out!
Welcome!

Here is their website. Currie Enterprises - Custom Rearends, Jeep/Off-road Parts, Crate Rearends, 4x4 Rearends
12-24-2012 12:15 PM
Con Artist
Quote:
Originally Posted by Jpdst29 View Post
Have you considered maybe a Currie suspension lift. I know their manufacturing facility is in Corona, CA, and they make a great lift with Johnny joints too.

Just something to consider.
Actually, I've never heard of them, but thanks for the tip! Will check'em out!
12-24-2012 12:00 PM
Jpdst29
Quote:
Originally Posted by Con Artist View Post
I'm with you there! The #1 reason I'm yet to lift is because I've been on the hunt for a kit made in the USA. I refuse to put sub-par quality parts on my vehicle. USA materials have to meet specific requirements, unlike the foreign-made TRASH.

Thus far the only kits I've found made in the USA are the AEV and Revtek kits. If anyone knows of any others, I'm open to suggestions, but as it stands, I'm aiming for AEV.
Have you considered maybe a Currie suspension lift. I know their manufacturing facility is in Corona, CA, and they make a great lift with Johnny joints too.

Just something to consider.
07-28-2012 07:44 PM
sjchoueiry
Quote:
Originally Posted by JeepHerz View Post
Guess I'll post a response to my own thread. I switched to 305/70/17 KM2s before install. I've noticed a little difference in power but its not significant unless I have the A/C on. With the A/C on I drive "manually" and on the freeway I keep it in 4th. Not a big deal- I have the top off most of the time anyway. Otherwise its barely noticeable and I am a speed demon. I don't plan to do the re-gear for this reason- but I really, really want my 35" Toyos back. With my lift on (I got 3.5" of lift) the tires look small, my Jeep looks a little wimpy (to me) and I want the clearance back. If I decide to fork over the money for 35s down the road I'll only do it with a re-gear.
I'm sorry I am late to this. I do have a 2012 JK Unlimited sport automatic trans and hard top. Got it stock with 3.21 and 32" tires (24S package). I since changed front bumper with winch, 4" lift with 35" tires, and side rock crawlers. I went rock crawling on a few trails rated difficult in the last few months and the jeep performed like a charm. You do however need to get the AEV ProCal module to set the ECM (car computer) for the 35" tires. This helps in performance otherwise your ride will be sluggish. Today I just got my car regeared to 4.88. Of course you need to use the AEV ProCal to program your car computer for the 4.88 gear. I can hardly wait to go rock crawling with the new gears. I am pretty sure that there will be quite an improvement over the 3.21.

I hope this helps.
07-20-2012 09:06 PM
SpydeR JKU lol im going to trust me
07-20-2012 09:04 PM
snochick Ooh so shiny! Go fix that. Lol
07-20-2012 08:59 PM
SpydeR JKU Hey everyone first post just got my 2012 JKU back from the shop today
Went with a
3" BDS suspension lift , FOX shocks
35'' 12.50 18 Nitto Trail Grapplers
18 inch Fuel Octane rims

I got the look i was looking for , not really any crazy terrain here on Long Island NY, a lot of beach etc , going to do some research for the closest 4x4 park .
Anyways just wanted to show some pics cant really comment on the lift as i only drove it home from the shop , felt pretty sweet tho.





07-20-2012 05:57 PM
jgallahan These have been some awesome suggestions. I can honestly say the dealer is absolute trash. I have a 2012 JKU that I got in November and haven't had the cash to do anything yet. I checked with the dealer here in Norfolk and they wanted $5800 for a three inch lift and 35's. I think I about crapped myself. I know of an aftermarket shop here that can do the work for a quarter of the price. I'm just ashamed that this dealer would charge that and get away with it.
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