Newbie here. Have a '46 Chevy 1-1/2 ton chassis I am going to mod with the beloved 4BTA but would like to back it up with a newer 6-speed automatic. The GM 6L90 is well within the torque specs and is a "double overdrive" (I am going for long-haul MPG). Has anyone gone this route or looked into this tranny? Other reasons it has me considering is fairly light weight (compared to an Allison) the built in controller and availability of aftermarket kits that should make for a (reasonably) smooth transplant (yeah, right). Also thought about the brand new (2010) Furd six-speed TorqShift, but the adapter & controller seem to be significant issues. Thanks in advance for any wisdom.