35's on 4.56 Gears

tma777

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singledaddio

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I just ordered Yukon 4.56 gears for my 3.6 manual JLU Sport S with 315/70/12.5 KO2's. Those tires feel so heavy to drive, I can't wait to get the regear done.
 

Shantz

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My JK had the 3.8 manual with 4.10s... it always needed a little more power. As soon as I get working again I'm going with the 4.56s. I have the 3.6 manual, Rear M220 Front M186 I'd like stuff some lockers in there as well. I'm on the fence with the lockers.
 

singledaddio

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My JK had the 3.8 manual with 4.10s... it always needed a little more power. As soon as I get working again I'm going with the 4.56s. I have the 3.6 manual, Rear M220 Front M186 I'd like stuff some lockers in there as well. I'm on the fence with the lockers.
My gf has a 3.8 JKU with 4.56 gears and 35's. I can feel how much the gear swap helped that and it's the 4 speed auto.
 

Shantz

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My gf has a 3.8 JKU with 4.56 gears and 35's. I can feel how much the gear swap helped that and it's the 4 speed auto.
The 3.8 was always a bit sluggish. The JLU Sport S I have now, I thought with the 3.6 would be fine... but the stock 3.45s are mud with the 35's. I almost never use 6th gear, unless I'm doing 90 downhill. I can't wait to upgrade.
 

Doubledwire

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Yeah, I’d look hard at the Rubicon owner feedback with that powertrain and 35’s to see what they think about 4.10’s doing the job well or not.

I personally plan to have two sets of wheels so I know I’ll be compromising. I’m leaning toward 4.10’s because I know I’ll never go less than the stock Rubicon tire size and never past a 35.
This thread is a little older, but anyway I have a JLU Rubicon, 3.6L auto. I recently put Nitto Ridge Grapplers, 35x12.5r17 on there. I also have the 2.5" Metal C. Game Changer lift, which actually gives you about 4" of lift. The factory 4.10 gearing is really working hard. Uphill it shifts at a much higher RPM, and It feels more sluggish. Plus its running hotter, and the fan runs at full speed when you run it up into the mountains. I'm looking to do a 4.56 re gearing soon, to get the performance back to normal. AEV does 4.56 on 37" tires even. I don't see going to 4.88 for my part.
 

DadJokes

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This thread is a little older, but anyway I have a JLU Rubicon, 3.6L auto. I recently put Nitto Ridge Grapplers, 35x12.5r17 on there. I also have the 2.5" Metal C. Game Changer lift, which actually gives you about 4" of lift. The factory 4.10 gearing is really working hard. Uphill it shifts at a much higher RPM, and It feels more sluggish. Plus its running hotter, and the fan runs at full speed when you run it up into the mountains. I'm looking to do a 4.56 re gearing soon, to get the performance back to normal. AEV does 4.56 on 37" tires even. I don't see going to 4.88 for my part.
With 35’s, I’m going 4.56 here soon.
 

Coletrickle

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This thread is a little older, but anyway I have a JLU Rubicon, 3.6L auto. I recently put Nitto Ridge Grapplers, 35x12.5r17 on there. I also have the 2.5" Metal C. Game Changer lift, which actually gives you about 4" of lift. The factory 4.10 gearing is really working hard. Uphill it shifts at a much higher RPM, and It feels more sluggish. Plus its running hotter, and the fan runs at full speed when you run it up into the mountains. I'm looking to do a 4.56 re gearing soon, to get the performance back to normal. AEV does 4.56 on 37" tires even. I don't see going to 4.88 for my part.
I have almost the same setup as you. I tow my camper some and it struggles to even stay in 6th gear. 7th and 8th are gone. I am torn between 4.56 and 4.88 gears. I have no plans now of going 37's. I am leaning more towards the 4.88 because of the heavy tire wheel combo and pulling a camper. Lets hear you guys chime in and help me decide what gearing I need for my circumstances.
 

DadJokes

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With a naturally aspirated 3.6, you’re going to need the rpms to get to the power that’s available there. This may help courtesy of AnnDee4444
 

Shantz

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Update...

Finally got the gears done this week, I am very happy! 4.56 with the 3.6L manual on 35's is a perfect fit for me. I think if I would have gone to 4.88 I would have hated it. I do a fair bit of freeway driving, and so far so good. I haven't taken her off road yet, as I am still breaking in the new gears. I have to say, being able to use 6th gear again is awesome!

1st gear is quick, if I'm on a bit of a down hill grade at a stop, I use 2nd to pull out. As for freeway driving, I haven't gone above 65mph yet, but so far no down shifting for wind or a 1% grade.

This was an upgrade for 3.45s. I think if I would have had 4.10s I would have saved the money and not upgraded.

I'll do another update once I have a long road trip, and a bit of off road action with them. First impression is solid.

4.56 + 3.6L + 6 Speed Manual = My Approval.
 
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