Hey everyone, im having a SUPER weird issue with my sc300. So basically, (while im driving anywhere from 10-100mph) it will just randomly rev up 1000rpms or so and stay there until i either slow down or speed up enough for it to switch gears. It will freak out if im going over 80mph and jump from 3k-4k every few seconds, which obviously scared the living **** out of me. Anyways, I have been experimenting and driving with OD (overdrive) OFF for a week or so now, and it hasnt happened at all. Does anyone know what it might be? I'm getting HORRIBLE gas mileage with OD off and I would like to fix it. Let me know, thanks!

EDIT: Its not the transmission slipping btw, I have already have someone tell me that... Its not upshifting or downshifting, I would probably be able to tell because theres absolutely no lurch or anything like there normally is when my tranny switches gears.

 

What year is your car?

 

torque converter lock up is failing