THANKS FOR THE ADVICE,,I'LL BE FLUSHING HEATER CORE & RADIATOR AS YOU SAID,,I HAVE A NEW RADIATOR FROM MY OLD RANGER WHICH I BOUGHT NEW BEFORE THE FRAME BROKE & KEPT THE ENTIRE DRIVE TRAIN,ENGINE INCLUDED,I ORDERED HEAD GASKETS FROM ROCK AUTO & SHOULD ARRIVE IN A FEW DAYS,THEN WILL REPLACE THEM,BUT WILL FLUSH AS YOU SAID FIRST,THANKS SO MUCH PJ I'LL LET YOU KNOW HOW ALL TURNS OUT ! ALSO SOMETIMES WHEN ACCELERATING SLOW TO NORMAL TRANS SOMETIMES SLIPS A BIT GOING INTO 2ND,I LET OFF THE GAS,WAIT FOR IT TO CATCH 2ND GEAR & SHE GOES FINE,IF I GOOSE IT NO PROBLEM SHIFTING,ANOTHER FRIEND A TRANS REBUILDER SAID IT'S A SERVO LOCATED TOO CLOSE TO THE EXHAUST,THIS TRANNY IS PART OF THE DRIVETRAIN I KEPT FROM MY OLD 99 RANGER W/BROKEN FRAME,BEEN DRIVING IT W/SHIFTING ISSUE ABOUT 8 YEARS IN 2 DIFFERENT RANGERS,I WAS QUOTED $ 1400.00 FOR REBUILDING BUT OTHER THAN THE SERVO I WAS TOLD IS BAD SHE WORKS WELL,NO TRANS SHOP WILL JUST REPLACE THE SERVO,ANY SUGGESTIONS ON TRANS ?