Re-gear?

[entropy]

I have a 4 door Rubicon with a 3.6L/ZF8 and does not match my experience at all and have posted a number of threads about it and gone through the full gambit of tires and gearing (33, 35, 37 & 4.10, 4.88, 5.13).

At altitude, the 2.0T is light years better than the 3.6L. I lost about 20% of my HP/TQ moving from sea level to 7K ASL, no avoiding it and the 3.6L does not have 20% of anything to spare. The 2.0T would not be impacted (or would be minimally) by this due to the turbocharger.

It all boils down to your tolerance for loss of performance...it appears that mine is pretty low.

Lol interesting. Cause I had a 2018 2.0 JLU. totaled on 2019 and went to a 3.6 JL and like the 3.6 better. Yeah in theory the 2.0 will be better at altitude and in practice I bet it is too.

Towing is not just about how much torque or power you can produce, it is more complicated than that. Again there is an article by Jeep engineers where they explain why the 3.6 is better.

Tolerance is a huge factor. I bet I just don't notice what others do. Regardless of that, my Jeep tows my trailer no issues. It also gets me over some pretty gnarly obstacles at over 8k altitude.
I did gold mountain with a 2 door willys 2.0 about 2 years ago. They were bone stock on 3.45s and 32s. I was bone stock with 33s and 3.45s. We did not notice any performance issues at all regarding torque going over obstacles with my Jeep. Both jeeps performed about the same with mine being able to better go through obstacles due to the bigger tires. I don't feel is underpowered at all. As a Jeep, it works, as a sports car, IDK maybe not? So at the end of the day, why would anyone re-gear from 3.45s to 4.10s on 33inch tires? would seem a bit OCD thing to do don't you think?

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[CarbonSteel]

So at the end of the day, why would anyone re-gear from 3.45s to 4.10s on 33inch tires? would seem a bit OCD thing to do don't you think?

If I was ABSOLUTELY POSITIVELY certain that I would never run larger than 33" tires, I would not re-gear to 4.10, I would re-gear to 4.56. Having run 33's and 4.10's I already know that I would hate it and definitely would not do it.

 

[Some Random Guy]

Ok, I know this question has been asked in different forms previously but let me ask once more.

I have a JLU sport with 3.45 gears and std tires from the factory. I want to put a set of Rubicon pull-offs on it so say 33”. I do not plan to ever go larger on the tires. I want to maintain the current acceleration and highway behavior and keep reasonable mpg. My use is 9 on road and the other 10% is beach sand and dirt roads. The labor for a gear change in my case is free.

3.6l v6 and auto trans

question: So change to 3.73 or 4.10?

will I need any spacers or suspension change in height to avoid rubbing or better shocks to control the heavier tires?
thank you very much in advance.

P.s. I may tow a boat or overland camping trailer. In my 2007 JKU I have run TrueTrac front and rear with 4.10 and 33s and will likely do that on this one as well. Of course that is a different engine and transmission.

These wheels sit a bit wider than stockers, so if you use stock wheels when upgrading to takeoffs you should be good. I was good with these, but did have to remove some bumper filler once I did adjustable control arms.
As for gears, I’m still in 3.45’s and totally fine. 6th is still useable on the interstate. Your experiences may vary and there’s no wrong answer.

 

[entropy]

If I was ABSOLUTELY POSITIVELY certain that I would never run larger than 33" tires, I would not re-gear to 4.10, I would re-gear to 4.56. Having run 33's and 4.10's I already know that I would hate it and definitely would not do it.

We definitely agree there. Yeah exactly. Why go 4.10s if going 4.56s cost the same right?. And if you know u gonna go 35s just go 4.88s.

 

[CarbonSteel]

We definitely agree there. Yeah exactly. Why go 4.10s if going 4.56s cost the same right?. And if you know u gonna go 35s just go 4.88s.

 

[No IFS]

Where have you seen Rubi axles? I saw a pair at Arizona selling for 3k. But usually they sell at around 5k, which is about the same as new.

The like new oem 4.10 ring and pinion sets are $200 -$250 obo I think there’s 10 sets on eBay now.
Deal on axles require more research craigslist and eBay and your local marketplace but $3000 - 3500. That’s reasonable to me. I would never pay 5K.. I was only suggesting to keep an eye out because you do stumble across the deals. A gladiator max tow has 4.10s but no lockers and they’re cheaper when you could find them.

 

[word302]

You are going to get numerous different opinions on this one since gear changes are one the most debated topics on here. But I can tell you that I got the 3.45 gears, 2.0T, and 33" falkens and my 2-door is still plenty quick. So based on my use case, you should be just fine. If you get Rubi take-offs, you shouldn't need to do anything else.

The 2.0 is a much different animal than the 3.6.

 

[kah.mun.rah]

We definitely agree there. Yeah exactly. Why go 4.10s if going 4.56s cost the same right?. And if you know u gonna go 35s just go 4.88s.

Are you going to be at Jeep Bash on the 10th? If so you can drive mine and see how much power actually isn't lost with 37s on the stock 4.10 with a 3.6 AT.

 

[entropy]

Are you going to be at Jeep Bash on the 10th? If so you can drive mine and see how much power actually isn't lost with 37s on the stock 4.10 with a 3.6 AT.

Id really love to. But no I probably wont go. I am scared of crowds ? Maybe sometime we will meet on a trail.

 

[word302]

The like new oem 4.10 ring and pinion sets are $200 -$250 obo I think there’s 10 sets on eBay now.
Deal on axles require more research craigslist and eBay and your local marketplace but $3000 - 3500. That’s reasonable to me. I would never pay 5K.. I was only suggesting to keep an eye out because you do stumble across the deals. A gladiator max tow has 4.10s but no lockers and they’re cheaper when you could find them.

Yeah but setting up used gears SUCKS. I don’t know any professionals that will touch them. Also you’re going to have to do some cutting and welding to make a rear JT axle work on a JL aren’t you?

 

[BuyHold]

Since this is a regear thread, I think I might as well throw my question into it.

I have a 2021 JLR (2DR) 6spMT w/3.6L. I currently have 35in Nitto TGs and would say there is a fair chance I will ultimately move to 37s when my current tires wear down... but plan on regearing within the next year well before a tire change will be needed.

I like going slow, taking my time, rarely drive above 70mph and off-road try to avoid aggressive skinny pedal application. I live in Washington state where there are lots of elevation changes though my home/neighbohood is basically sea level.

I have read so many of these regear threads that I feel fairly confident of my decision to go with 5.13s.

Any reason I should opt for different gearing? I would like to know what you all think?

 

[CarbonSteel]

Since this is a regear thread, I think I might as well throw my question into it.

I have a 2021 JLR (2DR) 6spMT w/3.6L. I currently have 35in Nitto TGs and would say there is a fair chance I will ultimately move to 37s when my current tires wear down... but plan on regearing within the next year well before a tire change will be needed.

I like going slow, taking my time, rarely drive above 70mph and off-road try to avoid aggressive skinny pedal application. I live in Washington state where there are lots of elevation changes though my home/neighbohood is basically sea level.

I have read so many of these regear threads that I feel fairly confident of my decision to go with 5.13s.

Any reason I should opt for different gearing? I would like to know what you all think?

I ***think*** I see 4.88 recommended more for a 6MT versus 5.13 for 37's. I would definitely recommend 5.13's for 37's with a 3.6L and a ZF8.

Someone will chime in on the 6MT and gearing...

 

[word302]

I ***think*** I see 4.88 recommended more for a 6MT versus 5.13 for 37's. I would definitely recommend 5.13's for 37's with a 3.6L and a ZF8.

Someone will chime in on the 6MT and gearing...

Oh no, deeper gears for sure with the manual. I have 5.13s with 37s and the manual and it’s great. I would go lower if it weren’t for tiny pinions.

 

[CarbonSteel]

Oh no, deeper gears for sure with the manual. I have 5.13s with 37s and the manual and it’s great. I would go lower if it weren’t for tiny pinions.

I have never looked at the 6MT gear ratios, so yes, agree. It would be about the same as the ZF8 with regards to operating RPMs at highway speeds:


TRANSMISSION: 850RE AUTOMATIC, EIGHT-SPEED OVERDRIVE

• Gear Ratios:
  • 1st - 4.71
  • 2nd - 3.13
  • 3rd - 2.10
  • 4th - 1.67
  • 5th - 1.28
  • 6th - 1.00
  • 7th - 0.84
  • 8th - 0.67
  • Reverse - 3.53

TRANSMISSION: D478 MANUAL, SIX-SPEED WITH OVERDRIVE

• Gear Ratios:
  • 1st - 5.13
  • 2nd - 2.63
  • 3rd - 1.53
  • 4th - 1.00
  • 5th - 0.81
  • 6th - 0.72
  • Reverse - 4.49

 

[2JeepsJL&LJ]

I just re-geared to 5:13 and think it’s great. I will be pulling a small teardrop style trailer. I haven’t had the time to pull the trailer yet but am certainly looking forward to it. See you at the Jeep Bash!!! It’s good times .

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