Just wanted to post the cure to a problem that I had been having for about the last 2 weeks. I had been having problems with the overdrive dropping out intermittantly, this would generally happen while going over bumps, I guessed that probably got a dodgy electrical connection. After going over the electrics, relays connectors etc, I could not find the problem, luckily later that day I blew a brake lamp and every time I went over a bump the lamp indicator came on, and the overdrive dropped out (As the system is designed to do, just tap the brake pedal when the car is on overdrive and it will drop out of overdrive). The cause of my overdrive problem was an oversensitive brake switch, repositioning the switch slightly cured my problem. I hope this will help somebody else.
Frootmig
