Longevity of 3.6L gasser, automatic transmission with 37" tires

[tom.mary.glad]

I'm hoping to get first hand experience from those of you that have the 3.6L gas engine, automatic transmission and running 37" tires.
How many miles do you have with that combination?
How many miles overall? (maybe you did first 30k miles stock, then upgraded to 37 and have put 30k on those, 60k total)
Type of daily terrain you drive and off-road "abuse"?
Any major issues so far?

I'm in north TX, so pretty much flat and it's my daily driver and I intend to do moderate to difficult trails ~6 times a year.

Thanks for all good feedback. Not so much the snarky stuff I know I'll get

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[Jesnamy01]

2022 Sport S - 3.73 gears, total miles 31,000. Miles on 37s - 25,000. No issues or regrets. Weekend driver - only driven in sand a few times while on vacation in Florida. Other than that mostly highway

 

[WILDHOBO]

At 12,000 miles I lifted it 3”, added 37’s, RCV shafts in the front, and upgraded steering components from steersmarts. I ran it that way until 49k miles as a daily driver, tow rig for small camping trailer, and heavy off road rig. I’ve had no major problems that I didn’t cause hitting rocks off road. The drive train has been fine. I’m now over 50k miles on my second set of 37’s. I’ve lifted it higher, replaced the shocks which were too small anyway, and added tons of armor along the way. No regrets. It’s holding up great. It’s finally time for ball joints, which are on order, and I change things out constantly, but not because of failures. It’s just my hobby.

 

[Idlethunder]

Only 4 days and 200 miles here but so far so good

 

[PuddleJumper]

Maybe 2k miles? I only run my 37s offroad. And I jump it. Plenty of air and she's all good. No issues yet.

 

[RogMac1175]

I’m running stock tires, but I do have the 3.6 and found out that before I bought it, the trans, trans cooler, and oil cooler were replaced at 20,000 miles.

 

[TARHEELKIDD]

2020, Sport S, Max Tow. Running 37 x 13.5 x 18 for approximately 40,000 miles. Zero issues. It feels like it was built for it, lol

 

[NGNERD]

Installed Clayton level kit at 15k miles and BFG KO2 37s. Added Dynatrac HD Ball Joints as preventative maintenance at 75k miles and upgraded from factory fox to aftermarket fox 2.0 shocks now at 80k miles, very little wheeling other than Ophir Pass in CO and fire roads for camping here in VA. No problems

 

[Zachanadandy]

There is a guy on the JL forum at 210k on his 2018 with the 3.6L with no issues.

 

[ttn333]

Lifted and 37s a 4 days after delivery. I'm at around 45k miles. Drive train has been fine with moderate offroading, lots off trail camping and daily driving. I'm on my second set of falcon shocks (not including the original fox). But I do run heavy with a full rack/rtt early on and now an alucab contour canopy/rtt. I did have powertrain issue last month. They had to replace O2 sensors from valve leaks that they resealled and also replaced a fuel injector and plugs. I have upgrade steering components from fusion4x4 waiting for install and planning on ball joints when I the do rcv axle shaft. Thinking about 38s next month. Not sure if I want more want more unsprung weight though.

 

[tom.mary.glad]

2020, Sport S, Max Tow. Running 37 x 13.5 x 18 for approximately 40,000 miles. Zero issues. It feels like it was built for it, lol

I also have max tow. How's the power with the 4:10s?

 

[TARHEELKIDD]

I also have max tow. How's the power with the 4:10s?

I was actually impressed with how well it accelerates. Even though 4.10 gearing is not the best for 37's, it can easily handle it. Acceleration is fine. I traded in a Silverado with 36's was a little worried before I test drove it and was pleasantly surprised.

 

[ttn333]

I was actually impressed with how well it accelerates. Even though 4.10 gearing is not the best for 37's, it can easily handle it. Acceleration is fine. I traded in a Silverado with 36's was a little worried before I test drove it and was pleasantly surprised.

4.10 was very usable around town and even on the highway if you don't mind higher rpms, which I didn't. But when you hit the mountains, you definitely want more gear, which was still livable until I picked up a lightweight camping trailer (2k lbs). That was a no go for me and had to regear to 5.13.

 

[Wild thang]

40,000 miles on 488 gears and 37 inch Mickey Thompson MTZ’s! Averages 16 miles a gallon
No regrets one day (40s)!!

 

[Jesse]

I was running 35's with stock 4:10. Almost never saw 8th gear! Just went to 37's and 4:88. SOOO much better. Acceleration is good, fuel milage is improved, and it cruises in 8th again! Well worth it.

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