[OutlawDrifter]

Black Bear Performance tune for the Vortec 454, change out the muffler, rest of the exhaust is fine. Plugs/wires/cap/rotor (don't cheap out on these parts). Drive the snot out of it!

I've got a 1999 K2500 Suburban with the 454 I drive daily. It has the snow plow package which *technically* makes it a 1-ton Suburban. I've towed an enclosed trailer on a hot day and never saw the tranny run above 195* with the factory tranny cooler.