There are two main reasons to re-gear your ride. The first is to recapture the lost drivability and fuel efficiency of a daily driven vehicle that has been upgraded with larger wheels and tires. The second is to fine tune the performance characteristics of a vehicle that is a dedicated off-roader where the focus is more on low-end grunt and acceleration.
We have identified a troublesome trend in the Jeep world. It seems too many Jeep JL owners think since they have an eight-speed transmission they don’t have to upgrade their gearset when they jump up in tire size. The thought process is the transmission’s gear ratios cover a wide spread and ‘compensate’ for the additional tire diameter that comes with rolling 40s.
The Jeep JL’s eight-speed automatic does a fine job of adapting to the increased load of larger tires, but you wind up not realizing the full benefit of the tire upgrade if the transmission won't shift into higher gears. It's not uncommon to see the tranny hanging out in sixth at light throttle on the freeway with oversized tires. Or to feel it shuttle shifting, trying to find the right gear for the situation. Even if you’re okay with that, the undue stress on the transmission can lead to early failure and a big hit to your wallet. Changing ring and pinion gears is the answer.
Check out the accompanying video and learn more about the benefits of re-gearing your JL Wrangler with Nic Ashby, the 2020 American SuperJeep Challenge Builder of the Year from Rockstar Garage.
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