Im currently running 3.73's on 33" tyres, and its not too bad, better than the 3.55's but 4.10 or 4.56 would be better
I have TCM limp issues and have yet to fix it....
That GDE will be the JK GDE tune i believe, but worth checking.
@Go'Ard, finding an AEV Superlift programmer will not be easy! Cant get new anymore im told...