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Old 07-26-2011, 09:59 AM   #1
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4.10 or 4.56 gears for 33" tires?

I have a 2001 Jeep Wrangler Sport I6 3-speed auto. It came factory with 3.73s and 30" tires. I now have 33x12.50 tires and I have lost acceleration, especially uphill. With the A/C on, it's horrible.

My main concern is on-road. Off-road 4 low works like a champ. It's getting to the trail, that's the problem.

There seems to be 2 issues. First, larger tire diameter means more tire roll-out which lowers the engine RPMs at any given speed. Second, larger tires weigh more which increases rotating mass that robs torque.

I am going to regear and need to know which ratio to get. Looking at gear charts, 4.10s will get my RPMs back to what it was with factory 30" tires (2788rpm). Problem one solved.

However, my new 33s and wheels are substantially heavier (like 14-16 pounds each, if I remember right). Would I need to go to 4.56 make up for this added rotating mass?

The charts say 4.56:1 will run the engine at 3099rpm at 65mph! That's gotta suck. However, it would be disappointing to go to the expense of regearing to 4.10s, to regret not going to 4.56s.

Thanks guys!

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Old 07-26-2011, 10:16 AM   #2
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Due to your 3-speed auto, 4.10 is the way to go for 33" tires. After I converted my 4.88 and 35" tire equipped TJ from the 5-speed manual to 3-speed automatic, I had the same rpms your chart pointed out it'd have with 4.56 and 33" tires. Not bad but a little too high. 4.10 will be ideal, unless you think you may eventually get to 35" tires in which case I'd regear to 4.56 since the rpms aren't THAT bad... once you get used to them at least.

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Old 07-26-2011, 10:40 AM   #3
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x2, I have the 32RH 3 speed auto and 4.10 gearing, turning 33" tires. Jeep runs well on and off the roads. I am happy with the setup, at 55mph - I believe my RPMs are under a tad of 2500.
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Old 08-15-2011, 03:29 AM   #4
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Anyone has the 5 speed manual with 3.73 gearing and 33s? would like to know if this combination works.
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Old 08-15-2011, 06:50 AM   #5
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I am also running 33s on stock 3.73 and it is a bit of a slug as well... looking for an HP 30 and an 8.8 to get the stock 4.10s and then I will regear after that I am thinking
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Old 08-15-2011, 06:52 AM   #6
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Anyone has the 5 speed manual with 3.73 gearing and 33s? would like to know if this combination works.
That's what I have. Not bad. I have no problems running at 75 on the highway (but I don't...) it's not a speedster that's for sure but it's not nearly as bad as some I've ridden in. In the end it works but probably isn't ideal.
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Old 08-15-2011, 07:24 AM   #7
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I have the 32rh, 6cyl, and 3.07 gears and was actually considering 3.73 as the best gearing for me (95% road). I really don't have a whole lot of problem on the highway, but it's pretty flat around here in the Mississippi delta. I turn 2500 rpm at 75 mph now. I don't want to get out of the powerband running 75 mph with 4.11s. Thoughts anyone?
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Old 08-15-2011, 07:41 AM   #8
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ok....i have 98 tj...5sp...6cyl....4.56 gears..running 33x12.5x15's and this is a pic of it doing 70MPH per my GPS and its not turning that high of RPM. id the tach off like the speedo?
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Old 08-15-2011, 09:29 AM   #9
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I have the 32rh, 6cyl, and 3.07 gears and was actually considering 3.73 as the best gearing for me (95% road). I really don't have a whole lot of problem on the highway, but it's pretty flat around here in the Mississippi delta. I turn 2500 rpm at 75 mph now. I don't want to get out of the powerband running 75 mph with 4.11s. Thoughts anyone?
Your 32RH changes the ratio recommedation, what size tires do you run?
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Old 08-15-2011, 09:37 AM   #10
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I was thinking of reagearing and running 32s on my 06 automatic tj and i was told it would be better if i regeared to 4.56 not 4.11s. Was this guys wrong?
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Old 08-15-2011, 09:41 AM   #11
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Originally Posted by TLATEOTW
Anyone has the 5 speed manual with 3.73 gearing and 33s? would like to know if this combination works.
I had that setup and moved to 4.56 because I lost 5th on the highway. I felt like I was burning up my clutch too.
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Old 08-15-2011, 09:43 AM   #12
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Originally Posted by psycho
ok....i have 98 tj...5sp...6cyl....4.56 gears..running 33x12.5x15's and this is a pic of it doing 70MPH per my GPS and its not turning that high of RPM. id the tach off like the speedo?
Wow that's crazy! Your speedo is off because I assume you never swapped put the speedo gear did you? Other wise that's exactly where my rpm sits at 70mph.
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Old 08-15-2011, 09:45 AM   #13
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Originally Posted by Yellow_Fox
I was thinking of reagearing and running 32s on my 06 automatic tj and i was told it would be better if i regeared to 4.56 not 4.11s. Was this guys wrong?
Nope. You may even go to 4.88 but I would wait and are what Jerry says. You have the 4 speed auto that has a very steep overdrive gear so you need more gearing to turn those tires. The OP has the 3 speed with no overdrive so he needs less gearing.
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Old 08-15-2011, 09:45 AM   #14
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Originally Posted by Yellow_Fox View Post
I was thinking of reagearing and running 32s on my 06 automatic tj and i was told it would be better if i regeared to 4.56 not 4.11s. Was this guys wrong?
Do 4.88s. I just put them on my 04 auto TJ with 32s and it is perfect. You can do 4.56 if you want, and will be okay, but don't put 4.10s in it.
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Old 08-15-2011, 09:46 AM   #15
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Originally Posted by psycho View Post
ok....i have 98 tj...5sp...6cyl....4.56 gears..running 33x12.5x15's and this is a pic of it doing 70MPH per my GPS and its not turning that high of RPM. id the tach off like the speedo?
Holy crap . Did you change your speedo gear????? My 98, 5sp, 6cyl, with stock 3.73's and same size tires as you only gives me a 4mph difference on the speedo. So when it shows me doing 65 I am actually doing 69 ( confirmed by the 74 in a 65 speeding ticket dropped down from 80 I got).

I am looking to go to 4.56's at tax time and will need to know which gear to buy to correct the issue.

As far as driving. I can hit a bridge here doing 70 and by the time I get to the top I got p!$$3d off people cussing me and am doing about 54. If I get a head wind I am screwed....
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Old 08-15-2011, 09:46 AM   #16
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I have a 97 sport with the 4.0 and a newly swapped 32rh 3 speed auto/ I am running 35s with 4.10 gears and I am really happy with it. At 70 mph I'm right around 2600 rpm.
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Old 08-15-2011, 09:49 AM   #17
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I had that setup and moved to 4.56 because I lost 5th on the highway. I felt like I was burning up my clutch too.
How so? I kind of know what you're talking about I think. And I have 3.73 with 33s and I use 5th on the interstate. Going up long hills you lose a lot of power and momentum but otherwise it seems to be alright.
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Old 08-15-2011, 09:51 AM   #18
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Originally Posted by Yellow_Fox
I was thinking of reagearing and running 32s on my 06 automatic tj and i was told it would be better if i regeared to 4.56 not 4.11s. Was this guys wrong?

Do 4.88s. I just put them on my 04 auto TJ with 32s and it is perfect. You can do 4.56 if you want, and will be okay, but don't put 4.10s in it.

o ok because i didnt know exactly how everything worked and when i saw him talking about it i thought what the guy told me was wrong and i didnt kno the sticks didnt have overdrive. so would the 4.88 be better for the car in fuel economy, and giving me better pick up?
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Old 08-15-2011, 09:54 AM   #19
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i didnt kno the sticks didnt have overdrive.
All TJ manual transmissions have overdrive... 5th on 5-speeds and 6th on 6-speeds are both overdrive ratios.
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Old 08-15-2011, 09:56 AM   #20
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o ok so then would the 4.88s be better for the car in fuel economy, and giving me better pick up?
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Old 08-15-2011, 09:58 AM   #21
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How so? I kind of know what you're talking about I think. And I have 3.73 with 33s and I use 5th on the interstate. Going up long hills you lose a lot of power and momentum but otherwise it seems to be alright.
I don't use the interstate too often and all of our highways are 55mph. It sucks lol. But even around town I felt like it was kind of struggling in 3rd to sustain 25mph. Idk I'm extreme happy with my 4.56 for the mountainous driving around here. The thing is especially torquey on take off if I want it to :P I squeaked the tires on a left hand turn into traffic lol. This weekend I hit 75mph on an interstate and it definitely had more go left. Also at Rausch is where my 4.56s really shone. I was just idling in 4lo and 1rst over EVERYTHING.
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Old 08-15-2011, 10:01 AM   #22
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Originally Posted by Yellow_Fox
Quote:
Originally Posted by Yellow_Fox
I was thinking of reagearing and running 32s on my 06 automatic tj and i was told it would be better if i regeared to 4.56 not 4.11s. Was this guys wrong?

Do 4.88s. I just put them on my 04 auto TJ with 32s and it is perfect. You can do 4.56 if you want, and will be okay, but don't put 4.10s in it.

o ok because i didnt know exactly how everything worked and when i saw him talking about it i thought what the guy told me was wrong and i didnt kno the sticks didnt have overdrive. so would the 4.88 be better for the car in fuel economy, and giving me better pick up?
Yeah it's the 3 speed auto that doesn't have O/D. The 4 sspeed auto and 5 speed manual have it.
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Old 08-15-2011, 10:08 AM   #23
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I don't use the interstate too often and all of our highways are 55mph. It sucks lol. But even around town I felt like it was kind of struggling in 3rd to sustain 25mph. Idk I'm extreme happy with my 4.56 for the mountainous driving around here. The thing is especially torquey on take off if I want it to :P I squeaked the tires on a left hand turn into traffic lol. This weekend I hit 75mph on an interstate and it definitely had more go left. Also at Rausch is where my 4.56s really shone. I was just idling in 4lo and 1rst over EVERYTHING.
Yea I'm sooo jealous lol. It's 25 though town here too and I just normally use 2nd gear. I runs at about 2000-ish rpms and I think it's fine. In 3rd it feels like it's lugging. But yea, I ONLY use 5th at 65mph+. Other than that, I use 4th because there's no power in 5th. I really wanna regear, but dang it's expensive lol. :P
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Old 08-15-2011, 11:08 AM   #24
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Wow that's crazy! Your speedo is off because I assume you never swapped put the speedo gear did you? Other wise that's exactly where my rpm sits at 70mph.
nope never changed the speedo (yet)...but that shouldnt effect the tach should it? BTW at 70mph i had a lot of power left..very impressed with this set up.
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Old 08-15-2011, 12:05 PM   #25
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nope never changed the speedo (yet)...but that shouldnt effect the tach should it? BTW at 70mph i had a lot of power left..very impressed with this set up.
Nope your tack is dead on.
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Old 08-15-2011, 01:44 PM   #26
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Originally Posted by Jerry Bransford
Your 32RH changes the ratio recommedation, what size tires do you run?
Sorry, 33x12.5 ATs. Really just feels as if I need a little more stoplight to stoplight power in town.
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Old 08-15-2011, 10:19 PM   #27
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I also have 2000 wrangler sport 3 speed auto with 4.10 gears. At 70mph my tach is around 3k-3.1k rpm. Is this rmp revving too high? Or my I should of gone with 4.56 gears to bring down the tach rmp? Im confused...
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Old 08-15-2011, 10:27 PM   #28
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Originally Posted by oIIIIIIo
I also have 2000 wrangler sport 3 speed auto with 4.10 gears. At 70mph my tach is around 3k-3.1k rpm. Is this rmp revving too high? Or my I should of gone with 4.56 gears to bring down the tach rmp? Im confused...
4.56 will make the tach go up at speed compared to your 4.11s
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Old 08-15-2011, 11:45 PM   #29
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I also have 2000 wrangler sport 3 speed auto with 4.10 gears. At 70mph my tach is around 3k-3.1k rpm. Is this rmp revving too high? Or my I should of gone with 4.56 gears to bring down the tach rmp? Im confused...
What size tires?
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Old 08-16-2011, 12:12 AM   #30
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33x15x12.5 wrangler mtr's.

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What size tires?

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