Do i need to Regear my JL RUBICON with 35 inch tires?

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Yes, before I knew that the Tazer existed, I bought a Superchips Flashcal to correct the tire size. Although I like the integration with the Tazer, is there any other reason to switch? The Flashcal allows me to change the tire size and also things like fog light dropout, TPMS, turning of the engine stop thing. Seems like most of the functions of the Tazer are present in the Flashcal.
After reading the description of how your jeep is driving, I thought you must not have reprogrammed the speedo and the transmission thought the factory 33's were still there.

No real reason to switch. I do like some of the added features of the Tazer like being able to lock the rear in 2hi and both in 4hi, winch mode that raises rpm's to a preset point, full traction control kill, etc.





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Are you regeared? I wouldn't expect 38s to hit 8th gear unless it's downhill with a tailwind.
No, still factory 4.10's. I still hit 8th quite easily when just maintaining speed, but it is a bit quicker to downshift when holding a specific speed while pulling a grade or driving into a headwind.

ARB air lockers and RCV axle shafts front and rear are part of the plan for the near future, so a regear would make sense while I'm in there. If not for that, I doubt that I'd bother.
 

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No, still factory 4.10's. I still hit 8th quite easily when just maintaining speed, but it is a bit quicker to downshift when holding a specific speed while pulling a grade or driving into a headwind.

ARB air lockers and RCV axle shafts front and rear are part of the plan for the near future, so a regear would make sense while I'm in there. If not for that, I doubt that I'd bother.
Adding ARB lockers, RCV front and rear and regear cost atleast $6k. You might as well look at swapping in ultimate/pro rock 44s at that point.
 

terryb

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Guess I'll be the dissenting opinion. Firstly, I don't think you have to regear, it's a personal choice with 35's. I installed tires and rims first to see how it drove without regearing. It lugged on even the tiniest incline or when taking off at a light. And yes I did reprogram for the larger tires and waited a couple of hundred miles for the auto transmission to learn the new shift points. I may be pickier than most, but I really didn't like the performance degradation.
After regearing the engine it performed the same as with the stock tires and rims. So to me it was well worth it. Also helped get back some of the lost gas mileage.
I've got Teraflex Nomad rims and Nitto tires. Not sure on the tires, but the rims are on the heavier side.
 
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Guess I'll be the dissenting opinion. Firstly, I don't think you have to regear, it's a personal choice with 35's. I installed tires and rims first to see how it drove without regearing. It lugged on even the tiniest incline or when taking off at a light. And yes I did reprogram for the larger tires and waited a couple of hundred miles for the auto transmission to learn the new shift points. I may be pickier than most, but I really didn't like the performance degradation.
After regarding the engine it performed the same as with the stock tires and rims. So to me it was well worth it. Also helped get back some of the lost gas mileage.
I've got Teraflex Nomad rims and Nitto tires. Not sure on the tires, but the rims are on the heavier side.
I saw a couple videos that weighed a 35x12.5 nitto trail grappler and a 38x13.5 and they were about the same.
 

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Adding ARB lockers, RCV front and rear and regear cost atleast $6k. You might as well look at swapping in ultimate/pro rock 44s at that point.
Very true. I'm saving the axle related goodies for last. I have zero complaints with my jeep right now. It drives and handles way better than bone stock as it sits right now. If/when my attention gets seriously pulled towards axles, I'll have a slippery slope to deal with. Prorock 44's or buy once cry once and go 60/80. If the latter, a few more tears for a hemi swap.
 

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I think the two main things to focus on here would be AT vs MT, & weight of your tire/wheel setup. My 35x12.5" kumhos with a MT transmission, def needs a regear.
 

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Rubicon, Auto Trans, 35s...no need for re-gear...IMO
 

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