Starts right up every time out it in drive foot on gas starts to go but never picks up, backfires, slight gain of powerful short time, loses that power till motor still running but truck accelerates no more!

The ABS light came as soon as it did the Transmission began hard shifting from 2nd to 3rd Shifted at about 3200 RPM, as soon as it got into 3rd gear RPMs dropped, it feels like I'm pulling a load. When I try to accelerate the clutch starts to slip in the convertor. If I am on a downhill grade, and I accelerate slowly, I can get the rig up to speed w/o spinning clutch. The transmission runs fine , until I reach an uphill grade then It bogs down rpms drop and any acceleration spins clutch again. OBD1 KOEO code 111 all is good. KOER code is also 111 all is good. ABS code 36 Right Front Brake Anti-Lock Sensor Diagnosis (Dynamic) New ABS sensors both front, New VSS sensor in rear. I am not sure what to check next, I'm hoping someone here might. Thanks, Jimmy