Well I found out that wiggling the pan onto the trans to when I swapped out the tcc solenoid I half unclipped shift solenoids. 3/4 are slipping bad so looks like Im pulling the trans out. I considered a rebuild but think I'm just gonna do the 80e swap from the start. I guess my main concern is can I use a older Version? I found some 93 big block, or a 98 diesel with floor shift transfer cases on Craig's for a decent price and wasn't sure if I could use it or I should look for one behind an ls. Since I have floor shift transfer case currently I don't think it would be any more complicated then hooking up linkage. Since I'm already 4.88s it should help with 80e first gear and will let me install Fi without fear of breaking. probably get a circle d 3200 on order.
2010 Silverado 4.8 Ext Cab 4x4
Cam, Stall, 4.88's