Depends on your ramp. How slippery is it? You can most likely just leave everything in 2wd on a well built ramp. If you start to spin, then just flip the switch to 4high, or pull it out to lock the rear diff if needed. If you're not sure, then just flip the switch to 4 auto and let the truck do its thing. 4 low is pretty low!
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2021 Moomba Makai
Black Cherry Metal Flake & Fire Red
Nibral OJ 15.5x15 Altitude/Wake prop w/1.76 trans v-drive
Wet Sounds bow speakers & 10's on the Tower & ported sub