Shifting in/out of overdrive

[Toups]

First of all, I have to say I love my 4-speed with electronic overdrive, as it really makes it easy to cruise at highway speeds and stay around 3k rpms.

Now, for the fun stuff! When I engage the o/d it takes about a second to engage (which is what most mondern cars do as well) HOWEVER, when I turn it off, it does not always disengage while still driving in 4th, and sometimes does not disengage until I have stopped and am driving in 1st again at which point I get a huge surge of torque and hp as the tach screams forward.


Any ideas to what is going on?

 

[aerog]

Could be the solinoid/valve isn't disengaging until the oil pressure drops down when you stop. Next time you change the transmission oil order a new set of gasket/screens, o-rings for the valve, and a new "ball" for the valve assembly and change those parts out when the oil is out of the transmission. The whole process doesn't take very long, and it's pretty simple.

 

[shorn]

After switching off the O/D, but still in 4th gear, step down on the accelerator a little. On mine it remains in O/D after it is switched off as long as a I maintain the same rpm's, but will kick off once I give it a little gas.

 

[Steve_S]

Check the oil level lately?

 

[vagt6]

Excellent idea, Steve. Low gearbox oil can make the OD shift slowly. I had an undetected leak in a J-type once, I was ready to rebuild it until I checked the oil, which was low.

Topping up the oil made it work like new.

Give it a try, let us know.