Ok I have a 1995 Chevy Blazer 4X4 with the 4.3L vortec. A while back I had the transmission rebuilt and the guys said he did some "upgrades" to it. What I noticed when I got it back was it no longer had takeoff power. before the rebuild I could spin the rear tires from a stand still with no problem....now I can barely brake torque it and it is sluggish to do that...any Ideas?