Has anyone upgraded their gear ratios on lifted big tires? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > TJ Wrangler Technical Forum > Has anyone upgraded their gear ratios on lifted big tires?

New Vendor - ARTEC Industries Battery MountsDana 30 Truss for your TJ, LJ, ZJ, and XJIntroducing MONSTALINER™ UV Permanent DIY Roll On Bed Line

Reply
Unread 10-09-2013, 08:24 PM   #1
Pentara
Registered User
2005 LJ Wrangler 
 
Join Date: Oct 2013
Location: Toronto, ON
Posts: 48
Has anyone upgraded their gear ratios on lifted big tires?

Howdy folks.

Haven't owned my 05 LJ for 2 weeks even but already I'm putting together a list of upgrades and mods. One thing I was told by a local Jeep shop was that my LJ was out of it's power band.

The previous owner put a 4" suspension lift and bigger, wider 33" tires, along with a 1" wheel spacer on the Jeep. No complaints, I love how it looks and drives. But... it is slow to accelerate.

Moving from a Honda Accord to a Jeep, I expected a reduction (It is a truck after all) but had no idea if the degree of acceleration was normal or not. The Jeep expert said it is not and I should upgrade my 3.73 gears to 4.10 ratios. But this costs $2,200+ for parts and installation on front and rear, so it's not a cheap upgrade and money's a bit tight right now.

I have no plans for off-roading any time soon, this is a street driver. I also haven't done anything significant to the I-6 engine.

Has anyone had similar experiences? Actually done this mod or a different ratio upgrade? What were your results? How do you feel now after doing the upgrade, worth it?

Appreciate all inputs and comments, thanks.

Pentara is offline   Reply With Quote
Unread 10-09-2013, 08:29 PM   #2
DezertTJ
Lost
 
DezertTJ's Avatar
2006 LJ Wrangler 
 
Join Date: Dec 2009
Location: Tucson, Arizona
Posts: 4,494
Yes it does drastically increase performance, but I'd go 4.88 with 33s and that auto tranny
__________________
06 LJ Rubicon: AZ Backcountry LJ Build
DezertTJ is offline   Reply With Quote
Unread 10-09-2013, 08:30 PM   #3
Jeffro06
October 2012 TJOTM
 
Jeffro06's Avatar
2006 TJ Wrangler 
 
Join Date: Jun 2007
Location: Total, Confusion
Posts: 9,527
I wouldn't upgrade from 3.73's to 4.10's....4.56 or 4.88's, but not 4.10's. 4.10's are livable, but not that big of an improvement over 3.73's.
__________________
Member of JGW (Jeff's Gone Wheeling) and IndyORV
My Old YJ Build My Mods My YouTube Channel

Moab Trails I've done: Onion Creek, Long Canyon, Dome Plateau, Top of The World (2), Fins-N-Things (2), Poison Spider,
Golden Spike, Gold Bar Rim, Hell's Revenge (2), Baby Lion Back, Cliff Hanger, Moab Rim, Kane Creek Canyon, Strike Ravine

Shortcuts to key points in my build: MTRk's OME 2" HD Lift Antirock Skidrow steering box & radiator skids LoD rear bumper
Rokmen Mercenary bumper w/Superwinch Rokmen sliders Skidrow engine skid Rampage Top CB set up
Custom trunk Rokmen 1" Billet spacers JJ track bar Rokmen Adjustable Control Arms Currectlync Steering
Rokmen Trail Corners Metalcloak Overlines Kentrol Hood Latches JK Turn Signals Xenon 4" Flat Flares Hood Decal Duratracs
Derale Tranny Cooler DieHard Factor 55 Thimble Ten Factory Front Chromo Shafts

Get your build sheet here.
Jeffro06 is online now   Reply With Quote
Unread 10-09-2013, 08:48 PM   #4
dodgethejeep
Registered User
 
Join Date: May 2013
Location: where I lay my hat
Posts: 126
Pee on the tire you have to establish dominance!!! Anyways, I got rid of the tj I had but I lifted it put on 33's and regeared it with a little help. Quadratec and many others sell the gears and swap kits. If your not scared to get hands dirty, I paid bout 200 to 300 for my gears and installed them in the garage with someone mechanically inclined. This was a couple years back but it made a huge difference. Before with a 4" lift, and 33's I could forget bout 5th driving on hiway. After 4.56's I could fly down the road with a boat on the back. Drove bit better than stock even with lift and rubbers. Dang thing would pass anything but a gas station. I went a bit deeper than Ineeded to on my gears, 4.10s would probly do the trick. Enjoy it while you can.
__________________
02 tj sold, 90 yj, 08 jku, 03 vf750.
When in doubt dump the mag.
dodgethejeep is offline   Reply With Quote
Unread 10-09-2013, 09:38 PM   #5
CommonSense
Registered User
2000 TJ Wrangler 
 
Join Date: Jan 2013
Location: Brighton, MI
Posts: 136
lol YES!! Pee on those tires and let them know whos BOSS. As far as the 3.73s go, my opinion is they are "livable" for 33s personally. If you do re-gear, 4.10s are only the right answer if YOU ARE CERTAIN that you will only keep 33s on the rig and NEVER go bigger. That is because 4.10s will restore your factory power band but that is it. Personally, truth be told, I wouldn't re-gear for 33s... just my .02 cents though
CommonSense is offline   Reply With Quote
Unread 10-09-2013, 10:03 PM   #6
Knuckelhead
AFSOC Retired
 
Knuckelhead's Avatar
2000 TJ Wrangler 
 
Join Date: Aug 2005
Location: Colorado
Posts: 15,030
Quote:
Originally Posted by CommonSense View Post
Personally, truth be told, I wouldn't re-gear for 33s... just my .02 cents though
Coming from someone using 31" tires...
__________________
TSB Information: http://www.automd.com/tsb/jeep_m/wrangler_mm/2000_y/
Knuckelhead is offline   Reply With Quote
Unread 10-09-2013, 10:05 PM   #7
rchase559
Registered User
2003 TJ Wrangler 
 
Join Date: Nov 2009
Location: 'Merica
Posts: 2,120
Learn to use the OD off switch frequently or gear it to 4.88. You will probably still end up using the OD off switch due to the large gap between third and fourth gear and how early the TCM makes the transmission shift and the torque converter lock up.

I'm assuming that the guys that recommend 4.10s must not have much if any experience with the 42rle behind the 4.0L.
rchase559 is offline   Reply With Quote
Unread 10-09-2013, 10:09 PM   #8
Knuckelhead
AFSOC Retired
 
Knuckelhead's Avatar
2000 TJ Wrangler 
 
Join Date: Aug 2005
Location: Colorado
Posts: 15,030
Quote:
Originally Posted by rchase559 View Post
I'm assuming that the guys that recommend 4.10s must not have much if any experience with the 42rle behind the 4.0L.
Ya think?...
__________________
TSB Information: http://www.automd.com/tsb/jeep_m/wrangler_mm/2000_y/
Knuckelhead is offline   Reply With Quote
Unread 10-09-2013, 10:16 PM   #9
Rrw600
Registered User
1997 TJ Wrangler 
 
Join Date: Jan 2011
Location: San Diego, CA
Posts: 345
I certainly would not spend the money to go from 3.73 to 4.10s. If you are going to spend the money, go a little deeper. As your post indicates, you've only had it for a couple weeks. Spend some more time with it, you'll soon see you want to do more with it. I ran 3.07s on 31s, then on 33s (not fun), then 4.10 on 33,s and then 35's. Now it 4.88s on 35s.
Rrw600 is offline   Reply With Quote
Unread 10-09-2013, 10:58 PM   #10
Jerry Bransford
Do it right or not at all
 
Jerry Bransford's Avatar
2004 TJ Wrangler 
 
Join Date: Jan 2003
Location: Escondido, California, California
Posts: 60,170
4.10 would be the wrong ratio for 33" tires and your 42RLE automatic transmission, you really need 4.88 for that size tire.

Don't make the mistake of listening to someone's 4.10 or 4.56 recommendation, they simply don't have experience with Jeeps with your particular transmission... go with 4.88 which is the ideal highway ratio... not to mention being superb off-road too. Yes I know 4.88 may seem to some to not be appropriate for 33" tires... but it is when you have the transmission you do.

Also, I've regeared twice... the first time for $1300 and the last time when I negotiated better, slightly less than $1100.
__________________
Getting Savvy...

Coolest offroad magazine ever! CRAWL Magazine

When you have a choice, buy American.

Jerry Bransford is offline   Reply With Quote
Unread 10-10-2013, 06:04 AM   #11
bobjp
Registered User
 
Join Date: Aug 2005
Posts: 1,344
I would have a hard time spending $1000-2000 for a re gear on a street Jeep. Heck, I have a hard time spending that on a Jeep I do take off road. Have you considered getting smaller tires? It would be a much cheaper option, and TJ's look good on 31's if you don't have a big lift. Just a suggestion.
__________________
97 TJ sport.
bobjp is offline   Reply With Quote
Unread 10-10-2013, 06:37 AM   #12
hokahay
Member
2003 TJ Wrangler 
 
Join Date: Jun 2006
Location: jensen beach, FL
Posts: 149
I started out with a stock X 3.73 and 27" tires. Then I put 31" MTRs on and it was sluggish. Then I re-geared to 4.56 and it was sporty. Finally I went with 33 " tires. It runs fine setup like that. I went thru 4 speedo gears. Now I am back to the original speedo gear so I am back to the factory power range and the speedometer is spot on.

Jerry is right in saying 4.88 is the way to go. I didn't lose any fuel mileage with 31s and 4.56s. Drove 2300 miles out to AZ and back even.

Math is your friend here. New Tire Diameter / Factory Tire Diameter * factory ratio = new ratio for the factory power band. And like the 31s with 4.56 a little deeper is better. I have a 42rle and fooling with the OD is a waste of time. Even worse is it starts shifting in and out trying to be happy.

If spending a grand on your jeep is crazy you're likely going to be back in a honda soon. lol. I am just finishing spending 10 times that on mine. And I am sure over the last nine years I have spent that ten grand already once before.
hokahay is offline   Reply With Quote
Unread 10-10-2013, 08:13 AM   #13
CommonSense
Registered User
2000 TJ Wrangler 
 
Join Date: Jan 2013
Location: Brighton, MI
Posts: 136
Yup. My fault. I overlooked the fact that OP has the auto tranny. Sorry OP, was going off my 5-speed when I said that!
CommonSense is offline   Reply With Quote
Unread 10-10-2013, 08:18 AM   #14
Unlimited04
This post/info=my opinion
 
Unlimited04's Avatar
2004 LJ Wrangler 
 
Join Date: Dec 2005
Location: Colorado
Posts: 23,301
I run 4.88s w/ 42RLE & 33s. before the regear, 3.73s was horrible on the highway. constantly downshifting...basically lost an entire gear.
Unlimited04 is offline   Reply With Quote
Unread 10-10-2013, 08:34 AM   #15
Skold
Registered User
1998 TJ Wrangler 
 
Join Date: Sep 2013
Location: BAILEY, Colorado
Posts: 175
Quote:
Originally Posted by Unlimited04 View Post
I run 4.88s w/ 42RLE & 33s. before the regear, 3.73s was horrible on the highway. constantly downshifting...basically lost an entire gear.
You think that's bad? Mine has 33's and 3.10 on the AX15. I have 2.5 usable gears it seems.

You recommend 4.88s? Is there any drawback to going with that? Who did yours for you and how much can I expect it to cost? I have D30/D35s.

Thanks!
Skold is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.