Originally Posted by JMH1950
All of a sudden on the way home from an hours drive, my trans quit going into overdrive.
I notice that now when the shifter is in the OD position and I let off the gas, the RPMs go to idle even if I'm going down a hill and the car is gaining speed. If I shift into D it doesn't free wheel like that at all, the RPM keeps pace with the speed.
Does this mean that a tranny rebuild is in my near future?
Trans oil was changed about 3000 km ago, old oil looked and smelled good, I just changed it because I had no idea when it was done last.
Mine has done the same thing. Unfortunately i didnt have my scan tool on it at the time, but heres the best thing my mechanic and i can come up with. Since both times mine happened it was on a long drive in HOT weather. My oil looked and smelled clean and red.
The trans was overheating and going into protection mode, refusing to let the car into 'TCC lockup' and letting you idle down all the way without the engine matching revs. Check lines for clogs or trans cooler. Check your water temp gauge. If this is showing hotter than normal you could be experiencing your trans overheating.
Computer glitch (i have a 94, been through a few of them) causes it to just not like overdrive. Because as soon as you pull over, turn off the car and restart it will shift fine through all gears with no cool down.
Something in the trans screwing up. Im hoping this is NOT the case as its expensive and mine was rebuilt only 39k miles ago.
I am not a mechanic and havent solved my problem yet, but maybe that will give you some ideas.