Best tire diameter for 4.56 gears on a DD? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 09-29-2011, 08:13 PM   #1
Jeeper
 
Join Date: Sep 2011
Posts: 32
Question Best tire diameter for 4.56 gears on a DD?

2006, stock non-Rubicon 42RLE tranny, stock non-Rubicon transfer case, 4.56 gears, 33 x 12.5 x 15 BF Goodrich T/A KO tires, 2" budget lift.

With the 33s it bogs down often. Going up a hill in a 40mph zone consists of 2 options: constant shifting between bogging/slowing down and revving until exceeding the speed limit, or turning off O/D to stay in 3rd gear. Sometimes it will hunt between 3rd and 4th on flat ground at 45mph.

Since it's far easier to get a smaller tire than it is to change the gears, I'll just step down in tire size if that makes a better daily driver setup.

Or, maybe the problem is the 42RLE and I can't do anything about it?

This Wrangler will "sometimes" go off road. Which is to say, it doesn't really need 33s.

Kev- is offline   Quote
Old 09-29-2011, 08:22 PM   #2
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 34,792
Images: 2
The problem is with the 42RLE's ultra-steep overdrive ratio which is why it doesn't perform well with 33" tires. The 42RLE's overdrive ratio lowers the engine rpms so low that the engine bogs far more readily than it does with other transmissions. 4.56 with that particular transmission is better suited for 31" tires. For 33" tires, 4.88 is optimal with the 42RLE transmission and 4.0L engine.

This is why I always recommend going to a lower axle ratio than is normal (like 4.88 instead of 4.56) for most other transmissions when there is a 42RLE transmission installed.

__________________
...Gone wheeling, back Sunday night.

When you have a choice, buy American.

Jerry Bransford is online now   Quote
Old 09-29-2011, 08:22 PM   #3
Jeeper
 
InvertChaos's Avatar
 
Join Date: Sep 2010
Location: NoVa
Posts: 8,054
That's too bad, the PO or whoever regeared it should've gone to atleast 4.88 with that transmission. I would say 32" or 31"?
__________________
|2004 Jeep TJ "Green Machine"|4.0L 5 speed Dana44|33x12.50x15 Goodyear Duratracs|2.5" OME HD coils + 1.25" body lift|OME NitroSport shocks|4.56 gears|Skid Row Engine Skid|BCC Sliders|Currie AntiRock|
InvertChaos is online now   Quote
Old 09-30-2011, 04:38 AM   #4
Jeeper
 
Join Date: Sep 2011
Posts: 32
Thanks for the replies!

31s is what I was suspecting, and will be just fine for the level of 4-wheelin' I expect to do in the next few years.

It wasn't me who had the gears put in, I would have done 4.88.
Kev- is offline   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
vehicle laws- from the texas department of public safety web site busemans Texas Jeep Forum 1 04-28-2011 05:26 PM
A heretofore unused spare tire... 79Scout TJ General Discussion Forum 8 04-27-2011 02:41 PM
Tire Diameter for better gearing BrendonD JK General Discussion Forum 4 04-21-2011 10:14 AM
Shackle Reversal Kit Bones YJ Tech Forum 6 12-05-2009 02:16 PM
Spare Tire Departure Angle osbornl1 TJ General Discussion Forum 3 02-27-2008 01:59 PM



Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 08:51 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC