overdrive mode does not work after tranny change

Anybody knows what can be the cause of the following problem: after the 52kmiles old transmission unit has been installed on my Mazda 929 the overdrive mode does not want to work.

The following is observed:

1. I can not fix the “HOLD” button on the AT shifter in neither ON or OFF position

2. The “HOLD” sign on the indicator blinks.

3. When I drive the car, the engine does not shift to the 4-th (overdrive) gear.

4. After resetting computer the symptoms 1 and 2 disappear, but only temporarily -- until the car moves a few meters. Then it all (symptoms 1, 2 and 3 combined) starts over again.

Probably, the problem is not a mechanical in origin but rather a failure of some electrical circuits. Mechanic who replaced the tranny has already inspected visually all the electrical connections of the transmission unit but did not find anything wrong.


Anyone can help here?

Thanks a lot!

I have a '92 929 purchased in '97 with 55,000 then, the tranny went @ 78,000 the dealer replaced it, I never hit the the button on my gear shift but I realized it does't work. I didn't have any other problems and am now @ 167,000 miles looking and running great. I have done my fair share of repairs.

Go to auto zone and ask for a free scan you should have a transmission code.
This transmission uses a solenoid pack for shifting. Was the correct torque converter installed.
Its very possible the shop left something unplugged a common occurance.