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Old 02-24-2009, 06:41 PM   #1
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4:10 gears ok for 33" 12.5

New to this forum, and need some advice. Im upgrading gears and i wanna run 33" 12.5 but i dont know if i should go 4:10 or 4:56. it is my daily driver and its still my priority, but i go off road a lot. Mostly beach for fishing but would like to get into bigger trails. I have 3" lift kit with 31 11.5 mickeys. what should i do?

2000 TJ sport/ auto

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Old 02-24-2009, 06:45 PM   #2
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Do a 1" BL, 33" tires and 4.56 gears.

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Old 02-24-2009, 06:56 PM   #3
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will 4.56 bring it back to stock because i have the same setup.. i just want the origina restore performance and hopefully restore some miles per gallon?
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Old 02-24-2009, 07:22 PM   #4
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Ditto on the 4:56 gears and a 1" body lift. Should work out fine and the 1" lift will save you $$ compared to going to a higher sus. lift.
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Old 02-24-2009, 08:04 PM   #5
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Your 2000 TJ's automatic transmission is a 3-speed. So while 4.56 is the usual correct recommendation for 33" tires, that is only true with a manual transmission or the newer 4-speed automatic transmission that is in 2003 and newer TJs. For your particular rig with your 3-speed automatic, 4.10 is the appropriate ratio for 33" tires. 4.56 would be too low of a ratio and your engine would be doing 3000 rpms at 65 mph.
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Old 02-24-2009, 08:06 PM   #6
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i have 97 3 speed auto with 4 inch lift and 33.. still 4.56 or 4.10?
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Old 02-24-2009, 08:14 PM   #7
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i have 97 3 speed auto with 4 inch lift and 33.. still 4.56 or 4.10?
As I recommended above, 4.10 is the appropriate ratio for 33" tires with your 3-speed automatic transmission.

As many of you know, I converted my 5-speed manual transmission to the 3-speed automatic last year. I am running 35" tires and had regeared to 4.88 previously when I still had the 5-speed manual transmission.... a great combination.

So when I converted to the 3-speed automatic tranny, it was with the same 4.88 gearing and 35" tires... my engine rpms are now excessive at 65-70 mph so I tend to cruise at 60 mph now. My 35" tires and 4.88 gearing produces about the same engine rpms as 4.56 and 33" tires would produce with the same 3-speed automatic. They are excessive. That's why I'm recommending 4.10 with 33" tires, the rpms it produces with that particular 3-speed automatic transmission (it has no overdrive) are ideal.
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Old 02-24-2009, 09:30 PM   #8
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Originally Posted by Jerry Bransford View Post
As I recommended above, 4.10 is the appropriate ratio for 33" tires with your 3-speed automatic transmission.

As many of you know, I converted my 5-speed manual transmission to the 3-speed automatic last year. I am running 35" tires and had regeared to 4.88 previously when I still had the 5-speed manual transmission.... a great combination.

So when I converted to the 3-speed automatic tranny, it was with the same 4.88 gearing and 35" tires... my engine rpms are now excessive at 65-70 mph so I tend to cruise at 60 mph now. My 35" tires and 4.88 gearing produces about the same engine rpms as 4.56 and 33" tires would produce with the same 3-speed automatic. They are excessive. That's why I'm recommending 4.10 with 33" tires, the rpms it produces with that particular 3-speed automatic transmission (it has no overdrive) are ideal.
mine is great on the trail, but the speed limit here is 70, everyone runs 75-80, i try to keep it around 65 @ 2800.
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Old 02-24-2009, 09:34 PM   #9
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Dittoe on the 4.10s

With your 3-speed auto, and 33's, 4.10s would be the best.
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Old 02-24-2009, 10:33 PM   #10
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thanks fellas
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Old 02-25-2009, 09:16 AM   #11
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thanks all... im gonna go 456
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Old 02-25-2009, 10:46 AM   #12
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thanks all... im gonna go 456
After all the explanations on why 4.10 would be the better ratio with your particular transmission?? You're not gonna like your highway rpms with that ratio.
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Old 02-25-2009, 04:24 PM   #13
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I run 35s with 4.10s and the 32RH auto tranny, and I think it's absolutely perfect for a DD/wheeler. I couldn't imagine putting up with 4.56s and 33s using a 3-speed auto.
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Old 02-25-2009, 11:08 PM   #14
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I just put 33's on my 2004 with Auto Trans. Would 4.10 be a good gear to go to for mine as well? I did a little online research and that is what I'm coming up with so far. I have 3.73 gears now and it seems fine, but I do want to upgrade it.
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Old 02-25-2009, 11:18 PM   #15
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I just put 33's on my 2004 with Auto Trans. Would 4.10 be a good gear to go to for mine as well? I did a little online research and that is what I'm coming up with so far. I have 3.73 gears now and it seems fine, but I do want to upgrade it.
You have a 4-speed automatic with an extra deep overdrive. Those with 33" tires are reporting that particular transmission doesn't work well until you get to the extra low axle ratio of 4.88. Yes that sounds like too low of a ratio for 33" tires but the particular transmission you have (the 42RLE) needs higher engine rpms than usual to compensate for its extremely deep overdrive ratio.
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Old 02-26-2009, 12:50 PM   #16
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With your 3-speed auto, and 33's, 4.10s would be the best.
Agreed...this is what I have.
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Old 08-25-2009, 02:46 PM   #17
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I was just reading through all this, and I have a question too. 3 speed auto, 4.0 97 on 33's would 3.73 be better for highway/city driving with minimal offroad time...or is 4.10 just better all around.

Reason I ask is I can get my hands on a HP dana 30 with 3.73 and then just regear my D35 to what is needed. My TJ is for college commute so I need best MPGs possible and the snow gets bad so I want to run the 33's...again, mainly on the street. so its 4.10 or 3.73 for me?

Thank you
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Old 08-25-2009, 03:11 PM   #18
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well, i get good mpg in town, but running 70mph, my mpg suxs... so i would recomend 3:73's for casual commute
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Old 08-25-2009, 06:18 PM   #19
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well, i get good mpg in town, but running 70mph, my mpg suxs... so i would recomend 3:73's for casual commute
Nice, thanks.

Have an Hp 3:73 dana 30 lined up for 100 tomorrow and a dana 44 with 3:73 for 300 I found local. Cant wait to get em it.
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Old 08-25-2009, 06:52 PM   #20
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Nice, thanks.

Have an Hp 3:73 dana 30 lined up for 100 tomorrow and a dana 44 with 3:73 for 300 I found local. Cant wait to get em it.
Ask what the dana 44 came from
not all 44s are the same
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Old 08-25-2009, 09:58 PM   #21
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Ask what the dana 44 came from
not all 44s are the same
One is from a scout with a power track lock, the other option is also from a scout with a posi...which one would be better if either

I also have a shot at a 8.8 from a mustang with posi rear end and disk brakes for 350...

whats my best choice..I found a good shop who said they will do what it takes to get it on my jeep for a max price of 300 or less. Thanks
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Old 06-29-2011, 05:40 AM   #22
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I have a 2004 Rubicon I6, auto, D44 lockers front and rear. I run 35s and she seems great on and off the road. Gas is 12 city and 14 highway
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Old 06-29-2011, 06:38 AM   #23
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Originally Posted by hulud44
thanks all... im gonna go 456
sorry, I could not resist.
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Old 06-29-2011, 09:08 AM   #24
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Holy 2 year old thread batman
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Old 06-29-2011, 09:45 AM   #25
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Holy 2 year old thread batman
Holy crap, haha. Did not even look. Shows up as recent. Lets see who dug it up

Added: a newer guy
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Old 03-31-2012, 01:59 PM   #26
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Originally Posted by Jerry Bransford View Post
As I recommended above, 4.10 is the appropriate ratio for 33" tires with your 3-speed automatic transmission.

As many of you know, I converted my 5-speed manual transmission to the 3-speed automatic last year. I am running 35" tires and had regeared to 4.88 previously when I still had the 5-speed manual transmission.... a great combination.

So when I converted to the 3-speed automatic tranny, it was with the same 4.88 gearing and 35" tires... my engine rpms are now excessive at 65-70 mph so I tend to cruise at 60 mph now. My 35" tires and 4.88 gearing produces about the same engine rpms as 4.56 and 33" tires would produce with the same 3-speed automatic. They are excessive. That's why I'm recommending 4.10 with 33" tires, the rpms it produces with that particular 3-speed automatic transmission (it has no overdrive) are ideal.
Jerry, this is extremely valuable post for many of us, as you really experience it. Can you share approx. consumption change?

I wanted to go to 4.88 and 35" in future, but now enjoy the 32" and got scared of pushing 35" mass. So I will try to sell the gears and buy 4.56 or 4.10.
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Old 03-31-2012, 02:04 PM   #27
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I can't really say how my fuel consumption changed between all my various axle ratio and transmission combinations because it's so bad I try not to think about it.

But regearing to a lower ratio to increase engine RPMs can actually improve (reduce) fuel consumption if it brings the engine RPMs back into where they become more efficient again.
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Old 03-31-2012, 03:24 PM   #28
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I have a 99 with the 3 speed auto, its on a 3.5" lift and 33s. Someday looking to put it on 35s. What ratio would I want? It is my DD and i do take it offroad, but definitely more highway driving than anything.

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