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Biggest size tire with 4.10 gearing?

22K views 20 replies 8 participants last post by  gixxerphil 
#1 ·
I've got a 2005 Rubicon with the factory 31" tire size. I'm thinking about possibly going to 32" or 33" tires, but I DO NOT want to re gear the Jeep by any means.

Would a 32" or 33" tire be to much for the stock 4.10 gears in regards to power loss?

I'm asking because when I put 31" tires on my old XJ (which had stock 3.54 gears) it just turned it into an absolute dog (messed up the shift points and everything).

Thanks in advance!
 
#3 ·
I have an "05 TJR 6spd with 33s.... wish it had 3.73s. You'll be fine.... but
automatic or manual?

I run 255/80R17s, 33x10.00x17. Which ride rough since they are E Rated.
My next tire will be 33x10.50x15s which are C Rated and the ride will be much smoother.

I had them on the stock Rubi wheels. No clearance issues.
If you run 33x12.50s you might need 4.0"- 4.5" backspace.
 
#4 ·
My opinion after owning Rubi's with both auto and manual.

Biggest tolerable tire size for 4.10 gears:

Auto: 33
Manual: 35

That's not to say the gearing will be optimal, it is just liveable at that size. My Dad's LJ is an auto running 33s on 4.10 gears and it's a bit underpowered for my tastes in the hills. It gets around town just fine though.
 
#5 ·
Mine is an auto. I would like to keep the stock 16" Moab wheels as well. So I guess the question now is what is the largest tire I can fit on the stock wheels, with a 2" OME lift and still be livable with 4.10 gears.

To be honest I would be happy with a 32" which I think should be fine since it's only an inch bigger than the stock tire size, correct?
 
#10 ·
With the automatic the big difference is 4th, Overdrive is 0.69. With the manual 6th, Overdrive is only 0.84.

That said 3rd in the auto is direct as 5th is with the 6speed. I usually drop a gear in the mountains. You, with that steep overdrive in the automatic will spend a lot of time with OD Off. Which is not bad but the automatic can go to 4.56 since the OD is such a dramatic jump.

Check this gear ratio calculator to help decide what you want long term. But you will be fine with 33s and the 4.10. Cruising on the Interstates at 80mph you might even prefer the 4.10 in OD... which should be 2300rpm. 70mph should be about 2000rpm. Dropping to 3rd will add 1000rpm.

Gear Ratio Calculator
 
#17 ·
2" Rubicon Express Budget Lift.

Tires are 255/80R17... love the size but they are E Rated and they ride like steel over rough roads. Next tires will be C Rated 33x10.50x15s. Not only will they ride better they will be lighter and cheaper.

Rims are ProComp 98s 15x8 with 4.5" backspace. Enough backspace for 12.50s. One thing with that backspace will be a need for 6" flares if you want to cover the tread.

I just went to the ProComp site 98s.... 15", $52.00... 17", $92.00. And 15" BFGs are another $50.00 saving from 17s.

The HighLine is AEV. Unfortunately AEV has abandoned the TJ market. If I damage a fender I will be looking for something else.... and I will NEVER buy another AEV part. Hate to see all those guys spending $70K on the Brute Double Cab in a few years when AEV abandons them too.

But I agree, the attraction to AEV was the "stock" look and the recycle of side marker and signal lights.
 
#21 · (Edited)
Would you care to explain? I thought you only needed an MML after a BL to realign the drivetrain and to get the fan away from the shroud.

I know that Savvy's(maybe others, haven't really looked into them) TT needs a BL to work and get everything flat.

I would think that if you lift your trans and engine without the BL, you'd hit the floor pan(unless you beat the shit out of it with a hammer) with the trans and get into the top of the fan shroud.
 
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