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Major upgrades GMT800, 06ish XL 2500
Newbie here. Gonna buy 2003--2006 Yukon XL, SLT W/ 8.1. Once rig here, one of the big "to do" on bucket list is upgrade tyranny to best there is. Forgive my Naiveté as relates to engine/tranny/rear end. But would it be possible to upgrade from 4 speed to like a 5-6 speed, ie 6L90 ? If I...- lowderkg
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- Forum: Engine & Drivetrain
