Okay… This is a bit long, but after a lot of backroom chat about my tranny problem I thought I would take you through the possibilities of what might be causing my tranny problem….with the hopes that some tranny expert can help me narrow down the most likely and most inexpensive fix.

Please keep this in mind while reading this entry... In my case, the "Transmission Programme" light use to come on when it popped out of drive, but after I did a fluid change it just pops out of gear from time-to-time and does not trip any codes. It’s as if electrically the tranny thinks it's in neutral… And it’s not my gear selector switch because I replaced it.

…Plus when it does pop out of gear, I just put the tranny in S3 momentarily and then put it back into drive and everything is fine again.

....And I have concluded that the tranny popping out of gear is definitely temperature related.

…Or maybe temperature as it relates to pressure or electrical failure. That’s the big question.

Here are my thoughts. If anyone wants to add there expert opinion I (we) would all appreciate knowing a little more about how transmissions work:

1) Bad gasket -- Possibly, but it seems like the problem would get worse over time or in the very least create problems of various types -- and in my tranny it only pops out of gear at 2500 RPM, and only when I do not accelerate (coast) and do not put any drive-load on the tranny. And it’s been doing this for a long time (years).

2) Throttle Position Sensor (TPS): ...but if this failed I would hope that there would be a code, and if the TPS was bad I doubt it would cause the tranny to pop out of gear... but I'm not sure of that. Anyone know?

3) Cracked drum.... Maybe but then you would think this would trigger a code for another part failure or perhaps clutch failure code???

4) Solenoid/wire harness..... Maybe? Perhaps most likely??? But which solenoid controls Drive gear?

(…Or perhaps I should ask if one solenoid controls both the drive gear and reverse?)

5) Maybe it's not a complete failure; i.e., maybe this problem solenoid ( or solenoids) are not allowing full pressure or the right pressure combinations to let the tranny work properly???? ….But will replacing the wiring harness alone fix this problem (50/50) ???

6) ....And maybe it always happens a 2500 RPM -- under no acceleration -- because this creates the right combination of "back pressure" and the troubled-solenoid can’t handle the back forces in fluid flow??? In other words, why does the application of pressure inside the tranny (as is the case when you accelerate) prevent the popping out of gear???

7) Worn valve body.... which means the solenoids can't do there job correctly? …. IF BE THE MOST LIKELY PROBLEM, I HOPE SOMEONE CAN TELL ME IF THERE IS AN OVERHAUL KIT FOR THIS CONDITION.

8) And last but not least, the ever popular wiring harness.

WHAT SAY YOU FORUM MEMBERS? My email address is imnprsd@yahoo.com.