At my wits end with this overdrive problem!!! Please help!
- Thread starter dudeyys
- Start date
Register to hide this ad
mistersnowman97
New member
Have you tried it in cruise? See if it makes a difference. I doubt it would, but who knows. TPS is my first guess, but I see you've already done that.
When it does shift, is it rough?
When it does shift, is it rough?
Yeah, same issue in cruise. When it down shifts into 4th gear the RPM's jump up to about 4000 at 70 mph as opposed to 2000 lol. And it does it randomly shifting in and out when ever it wants.
4th gear is overdrive. Mine will sometimes sit at 4000 going 70 in 3rd gear and sometimes it will shift into overdrive. Doesn't matter what temp the engine is at. Interested to see what your problem is
Sorry I meant it down shifts into 3rd gear randomly and back into 4th randomly. I cant speak for other years but with 2nd gens I know for certain it had to be at operating temperature before the computer will even allow it to shift in to overdrive which is why I changed my CTS. Unfortunately it was all in vain. Only thing I can think of now is replacing the overdrive solenoid. Not a cheap part so I'm open to suggestions before I buy it.
Wish I could help you but I've got the same problem
Outlaw wheeler 024
New member
Somewhat the same prob!
Mine shifts funny like that when I pull back to drive and go into 2nd
Mine shifts funny like that when I pull back to drive and go into 2nd
Buck Bridges
New member
Thermostat...
Might want to check your thermostat. If it isn't working properly, your O/D will of course have issues. I replaced mine last week after having O/D issues and it fixed the problem. Saved a bunch of money as I was going to bring it to a tranny shop to diagnose.
Might want to check your thermostat. If it isn't working properly, your O/D will of course have issues. I replaced mine last week after having O/D issues and it fixed the problem. Saved a bunch of money as I was going to bring it to a tranny shop to diagnose.
broken wrench
New member
Is this a stock truck ?
Yes its a stock truck. The only aftermarket item on it right now is the muffler. And to the other response. I already tried changing thermostat :/ this overdrive problem is seriously killing my gas mileage and the revving sometimes makes my idiot light oil temp come on. Idk maybe i gotta replace the solenoid. Its the only thing i can think of at this point. Even my neighbor who is supposedly a "master mechanic" is stumped. Its like this issue is a mystical unicorn that doesnt really exist lol
4runnerBrett
New member
Replace the thermostat. Its a super cheap fix And I almost guarantee it fixes it.
broken wrench
New member
have you done the diagnostic code flash with OD light , is your light blinking ?
Not yet i have an obd2 but not an obd1 lol. No the o/d light stays off when i have the button toggled on.
broken wrench
New member
There is still a trans diagnostic that you can run ,get an fsm . But if your light isn't blinking then most likely its not any soleniods but burnt clutchs
ryanbigcheese
New member
No overdrive, check thermostat
Start with the thermostat! Just pulled mine apart because it was almost never going into O/D and sure enough when i pull the tstat out the part had been cut out and there was just the outside ring and no working parts. I popped a new one in ($6 only) and replaced the coolant and took it on the freeway and it kicked right in to overdrive. Runs way better now
Start with the thermostat! Just pulled mine apart because it was almost never going into O/D and sure enough when i pull the tstat out the part had been cut out and there was just the outside ring and no working parts. I popped a new one in ($6 only) and replaced the coolant and took it on the freeway and it kicked right in to overdrive. Runs way better now
