Diesel performance when larger tires are added?

[rcr1340]

I am thinking about ordering a diesel. I'm just not sure which package. With all the torque the diesel has it doesn't seem to me a 4:1 transfer case is needed. I have owned Rubi's before and loved the 4:1 BUT they were gas powered. When most companies convert a Wrangler to a V8. they replace the 4:1 transfer case with a 2.72 transfer. They say it has more torque and doesn't need it. Too low. I do plan on rolling on 39s and usually mod my Wranglers pretty heavy. What have ya's found with the diesel when larger tires are added?

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[oceanblue2019]

I am thinking about ordering a diesel. I'm just not sure which package. With all the torque the diesel has it doesn't seem to me a 4:1 transfer case is needed. I have owned Rubi's before and loved the 4:1 BUT they were gas powered. When most companies convert a Wrangler to a V8. they replace the 4:1 transfer case with a 2.72 transfer. They say it has more torque and doesn't need it. Too low. I do plan on rolling on 39s and usually mod my Wranglers pretty heavy. What have ya's found with the diesel when larger tires are added?

The few guys I know with Diesels are on 35's or 37's. They handle the 35's well, but with 37's really do need a re-gear if you care about how it drives. They also pickup significant mpg when re-geared with 37's which I think is interesting.

 

[rcr1340]

bump

 

[rustyshakelford]

We wheeled with some folks with the new 3.0 is Moab. They loved them. We drove both of them and they were both on 37s. Did exceptionally well and didn’t seem to crave a regear. It would be beneficial but not as critical as the 3.6. I would definitely go with the rubi for all the benefits and 4:1 tc

Brett

 

[rcr1340]

Not many diesels out there right now but I keep seeing more

 

[Robbyreneeward]

I’ve done way too much digging on this. Just bought mine Wednesday. I’m gonna go with a 2.5” lift and stick with 35s for now. Wanted to run 37s but was told by several folks it’d be beneficial to regear or it’d run like a dog, and you’d rarely see 7th or 8th gear.

 

[Tank the Jeep]

My JLURD is on 37s with stock 3.73 gears. It runs and drives fine. Sure I would have liked it to be 4.10, but the performance is acceptable as is. I wheeled it on the rocks at Uwharrie a few weeks ago. Again no problem. As far as mpg, if I set the cruise to 65 and drive reasonable, I can get 30+ on the highway. I’m happy with my 37s on my JLURD.

 

[WranglerAdvs]

Guys wheeling the diesel hard with 37s are re-gearing to 4.56 or 4.88. Sure, it will drive better than the 3.6 with stock gears but it’s not ideal.

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