As some know my '04 Envoy was in an accident and with all the work and they keep finding things wrong I was wondering: My good friend runs the used lot at his dad's Chevy Dealership. He has an '06 Maroon TB SS. I was wondering, the trans should be a 4L60E (as 'burbans 2500 had 4L80E [TH400 w/electronic OD]) is the 4l60E a th350 in the same? Either way its AWD only, not selectable. Can a selectable transfercase be put in such a regular TB or a electronic selectable from a 2000 era Taho if a TB one is too weak? I like to know I am in 4WD with a locker in the rear rather then power being shifted all over since we get a ton of lake effect snow. I looked for a while for a thread on this but did not find one. If there is one let me know and sorry i missed it, but since my son will be share'n this truck with me I may trade in the 'voy for the TB SS since it will not be much will be $3000 and mine which mine has seen NE winters and one on the lot came from FL it's 2 years newer but both have under a 100k on them and the ss has 20" wheels with nice Cooper discover ATR3 on it. The T-case is my only concern. What do you think can it be done?