regearing with 31s

Adam013085 · 01-08-2007, 05:18 AM

I have 31 12.50 15 tires and am wanting to upgrade my gears. I am new to this part of stuff and do not know what to go with. I got the 3.07 in them now. what should i go up to? Its a lil sluggish, not real bad but would like it to be a lil bit quicker plus the gas mileage might go up a lil too. how much will i see my mileage going up? Thanks for all the input

jsblu974x4 · 01-08-2007, 07:10 AM

automatic or manual? also do you plan on going wth any larger tires than 31?

Bermudacat · 01-08-2007, 09:37 AM

Wait and upgrade the rear at the same time. Try to find someone who's selling a D44 with a front axle that are already geared and locked.

dfvaulter · 01-08-2007, 11:00 AM

I bought axles with 4.10s in them and swapped them into my jeep, a little low with 31s, but I was also planning on going to bigger tires.

Adam013085 · 01-08-2007, 01:41 PM

I plan on 33s after my 31s wear out or when the jeep is paid off which is about 5 years from now. its the 4.0 auto

ClemTigerTJ · 01-08-2007, 02:17 PM

I have a similar set up on my 2005 TJ, except I have the manual. What kind of decrease in mileage will I see if I go to 31's and stay with the 3.07 gears?

Adam013085 · 01-08-2007, 02:19 PM

I get around 15 i think not 100% sure cuz my speedo is a lil off

booboodmb · 01-08-2007, 02:50 PM

Quote:

Originally Posted by ClemTigerTJ

I have a similar set up on my 2005 TJ, except I have the manual. What kind of decrease in mileage will I see if I go to 31's and stay with the 3.07 gears?

I get a little over 19 highway and about 16.5-17 city with this setup (31's with 3.07 gears). I never noticed a decrease in mpg, but there is a decrease in power in 5th gear on the highway.

I would wait to regear when you decide to go bigger, the cost to get 3.73s installed now and then regear again a few years later doesn't make much sense to me. I'd wait and save the money for Dana 44 or an 8.8 with the gears you want, it will end up being the same price, if not less, than what you are considering doing now.

02 Apex TJ · 01-08-2007, 02:55 PM

I was getting 11 mpg with 31's and 3.07's I was forced to switch to my stock tires again, it had no power for hills (had to go to second gear) and it wouldnt move out ofits own way in 5th gear... I am now getting 15mpg..... I just bought some 3.73 gears.... hopefully I can slap the 31's on again and keep it the same as it is now......:chugger: Sad part is I have a 95 mustang with 450 rwhp and it gets 11 mpg sooo it was time to regear......

01-08-2007, 05:18 AM	#1
Adam013085 Registered Join Date: Aug 2006 Location: Southern Illinois Posts: 767 Thanks: 0 Thanked 0 Times in 0 Posts	regearing with 31s I have 31 12.50 15 tires and am wanting to upgrade my gears. I am new to this part of stuff and do not know what to go with. I got the 3.07 in them now. what should i go up to? Its a lil sluggish, not real bad but would like it to be a lil bit quicker plus the gas mileage might go up a lil too. how much will i see my mileage going up? Thanks for all the input __________________ Lookin for a cj yj or tj. good ones are hard to come by.

01-08-2007, 07:10 AM	#2
jsblu974x4 Registered Join Date: Feb 2006 Posts: 348 Thanks: 0 Thanked 0 Times in 0 Posts	automatic or manual? also do you plan on going wth any larger tires than 31? __________________ 05 Unlimited Rubicon, Clayton Long Arms, CO2 System, Warn Tire Carrier, Warn Winch.....Yada Yada..

01-08-2007, 09:37 AM	#3
Bermudacat Registered Join Date: Mar 2002 Location: The Jet City Posts: 2,369 Thanks: 0 Thanked 0 Times in 0 Posts	Wait and upgrade the rear at the same time. Try to find someone who's selling a D44 with a front axle that are already geared and locked. __________________ My wife yes, my dog maybe, my Jeep never.

01-08-2007, 11:00 AM	#4
dfvaulter Rossicon Edition Join Date: Oct 2003 Location: charlotte, nc Posts: 1,887 Thanks: 0 Thanked 1 Time in 1 Post	I bought axles with 4.10s in them and swapped them into my jeep, a little low with 31s, but I was also planning on going to bigger tires. __________________ 97 TJ 4.0, 30/8.8, 4.10s, lock rights F/R, SYE, York OBA, 34" LTBs

01-08-2007, 01:41 PM	#5
Adam013085 Registered Join Date: Aug 2006 Location: Southern Illinois Posts: 767 Thanks: 0 Thanked 0 Times in 0 Posts	I plan on 33s after my 31s wear out or when the jeep is paid off which is about 5 years from now. its the 4.0 auto __________________ Lookin for a cj yj or tj. good ones are hard to come by.

01-08-2007, 02:17 PM	#6
ClemTigerTJ Registered Join Date: Oct 2006 Location: New Jersey Posts: 31 Thanks: 0 Thanked 0 Times in 0 Posts	I have a similar set up on my 2005 TJ, except I have the manual. What kind of decrease in mileage will I see if I go to 31's and stay with the 3.07 gears? __________________ 2005 Jeep Wrangler X

01-08-2007, 02:19 PM	#7
Adam013085 Registered Join Date: Aug 2006 Location: Southern Illinois Posts: 767 Thanks: 0 Thanked 0 Times in 0 Posts	I get around 15 i think not 100% sure cuz my speedo is a lil off __________________ Lookin for a cj yj or tj. good ones are hard to come by.

01-08-2007, 02:55 PM	#9
02 Apex TJ Registered Join Date: May 2004 Location: Denver NY Posts: 131 Thanks: 0 Thanked 0 Times in 0 Posts	I was getting 11 mpg with 31's and 3.07's I was forced to switch to my stock tires again, it had no power for hills (had to go to second gear) and it wouldnt move out ofits own way in 5th gear... I am now getting 15mpg..... I just bought some 3.73 gears.... hopefully I can slap the 31's on again and keep it the same as it is now......:chugger: Sad part is I have a 95 mustang with 450 rwhp and it gets 11 mpg sooo it was time to regear...... __________________ 02 Silver Apex, arb bull bar,Warn 8000xi winch, piaa 1900x platinum, westin side steps, hidden hitch class 3, kenwood 1000 watt amp with a 10 inch tube and 2500 watt max pioneer. 02 Dodge Ram Cummins twin turbo (dad's, and mine) 95 mustang supercharged 534 rwhp, 563 lb ft tq 95 polaris xlt special 600 triple snowmobile, studded 93 polaris xlt special 600 triple snowmobile bored and stroked, tripple pipes, slp clutch kit, studded. (all on a college budget) My lawn business is strictly to fund my toy's...

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode