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4.10 or 4.88 for my 3.6 ESS

mul1gan

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So would I be ok with the 4.88 if I 1) keep it stock or 2) small bump to 34"?
What kind of issues, if any would I run in to with the stock setup running 4.88?

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AcesandEights

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I would look at RPM calculators and see what you think your driving style or speed will be. I personally think 4.88 is too low for 34" tires; however, I don't use 6th gear very often (I have 4.1 now) and have ordered another JLR with 4.88. The reason I went with the 4.88 though is because I'm going to almost immediately put a 35" tire on. The 35" tires I plan to use actually measure over 35", so I think the 4.88 will allow me to use tall tires and 6th gear more often, while giving me a 100:1 crawl ratio for slow downhills.
 

Some Random Guy

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I'd go 4.88. I wasn't a huge fan of 4.10's even on stock tires. And if you're one of us, you will upgrade.

However, if you do a lot of interstate driving I'd stick with the 4.10's on stock tires.
 
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mul1gan

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If your staying stock or barely going up in tires to 34” why do you think you need 4.88 axle gears?
more torque, better acceleration, useful 6th or am I wrong? I am not too concern with MPG despite ridiculous gas prices these days.
 

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mul1gan

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seems worth the upgrade for 800-900 bucks... wish they offered 4.56, would be a nice in between.
 

jessedacri

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I'm on 35s and 4.88s and it's a dream with the 3.6. Tons of acceleration and calm on the highway with ~19-20mpg on flat freeway. I would have regretted 4.56s I think, the difference between the two isn't so massive that you'll regret it and I fear I wouldn't have noticed the jump from 4.10 to 4.56.

I'm not sure how it would do on stock 33s but 34-35 should be fine.
 
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mul1gan

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im sure at some point I will go with at least 34 min so planning ahead the 4.88 makes sense. Im in love with those bronze wheels. : )
 

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If you at any point think you are going to move to 37's, then go 5.13 from the start. The 3.6L does not have disposable torque at its fingertips. The 2.0T and 3.0L diesel have enough torque to compensate, the 3.6L does not.
 

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I assume we're talking a Pentastar with 6-speed manual powertrain combo here?

If that assumption is accurate, 4.88's all the way. The Pentastar doesn't make any power until you wring it's neck and the Aisin is geared for a vehicle that wants to drive 120mph. Even with factory 285/70's (assuming Rubicon), I wouldn't hesitate for 4.88's if it were an option when I ordered my Jeep and I knew then what I know now.

If we're talking an automatic transmission, you can probably go either way and be just fine until you get into big tires (37" or higher).
 
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mul1gan

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correct 3.6 ESS 6sp and 35" is the largest I will go (if that). thanks guys, I splurge and opt for the 4.88
 

AcesandEights

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...

The Pentastar doesn't make any power until you wring it's neck and the Aisin is geared for a vehicle that wants to drive 120mph...
I think the 3.6L makes almost peak torque by 2,250 RPM.
 

Some Random Guy

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If you at any point think you are going to move to 37's, then go 5.13 from the start. The 3.6L does not have disposable torque at its fingertips. The 2.0T and 3.0L diesel have enough torque to compensate, the 3.6L does not.
I think @mul1gan is looking at the factory options, so 4.10 vs 4.88. At least, that's how I read the post. Otherwise, I do agree most people seem to like the 5.13's.
 

Jmos4

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Hi,

I have a 22 JLUR with 4.88's on order, planning on going to 35's, but it's cheaper to get factory gears vs doing it down the road.

I came from the mid 80's Toyota pickup world and those came with 4.10's with 28's and when upgrading to 33's 4.88's was the gear, and that was with a 2.4 liter 4 cylinder that also liked to rev.

Regards,
Jim
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