1991 Toyota Pickup Q&A

1991 Toyota Pickup Question: i have 1991 toyota p/u automatic transmission,when on freeway goes in and out of

Answer 1
DID THIS JUST START? WITH THIS ENGINE AND TRANS. SET UP IT WILL DO THAT,BUT NOT IN & OUT EVERY SECOND WITH STEADY THROTTLE. IS ENG.RUNNING OK? IF SHIFT POINTS IN OTHER GEARS AT HIGHER RPM POSS. DETENT CABLE OR ADJUSTMENT. -
Answer 2
that means the transmission is hunting for the right gear...due to possible sticking valves or low fluid. -
Answer 3
Don't go on freeway.... BOTH are correct. Make sure engine is running properly and check fluid level (hot and on LEVEL ground in park. Use toyota fluid for best results or a good grade dexron III. If it's been more than 30K , it probably wouldn't hurt to change the filter (or remove and clean screen - I don't remember which they had). Also one wild thought.... if I remember correctly , that has a button to turn overdrive 'off' , is that working properly? -