HAVE AN 83' T/A... SOMETIMES THE TRANNY SHIFTS FINE, OTHER TIMES IT DOESN'T WANT TO SHIFT. SOMETIMES I WILL START FROM A STOP AND IT WON'T SHIFT 'TIL ABOUT 3000 RPM'S (SPINNING THE TIRES) IT DOESN'T SLIP OR ANYTHING... ALSO, I WILL DRIVE IT FOR A COUPLE DAYS AND IT'S FINE THEN IT WILL START ACTING UP AGAIN ONLY TO GO AWAY LATER. SHOULD I JUST DRAIN, REFILL, AND REPLACE THE FILTER?

 

Your first step would be to turn off the caps locked on your keyboard. It is considered impolite. Now, you should probably start saving your money for a new tranny, hahahaha. Sorry. Just kidding. I would swing into a good local tranny shop first and have them take it for a spin, with you riding of coarse. An expert can tell a lot by the way a tranny feels. It certainly couldn't hurt to change the fluid and filter. Good luck and welcome to the forum.