Transmission not up-shifting 1987 TD300

[elb2]

I have a 1987 TD 300 automatic with 200,000 miles on it. It recently did not up-shift from 2nd gear so I pulled over and turned of the engine then restarted it, drove off and it up-shifted properly through all the gears. A few days later it did it again and the same fix worked. After it happened to my wife she took it to the mechanic who said it needs a new transmission. This current transmission, other than the described new problem, shifts crisply and does not slip. It seems to be a control system problem like a stuck kick-down electric control that was reset by turning the car off or some other valve that is getting stuck. Changing the transmission seems a little extreme. Do people repair or only replace transmissions? Anyone have any idea what might cause this?

 

[elb2]

Cruise control failed just before this occurred, is there a speedometer feed wire to the transmission on this model?

 

[television]

Nothing wrong with the box I think that you are missing a speed signal somewhere

 

[Bolide]

There is no electronic control on this box - it's all hydraulic and vacuum-controlled. I'd go looking for pipes off, air leaks, etc and also check the fluid level

Nick Froome
www.w124.co.uk

 

[sigman]

My 124 had same problem intermittently ( kick down cable sorted it ) good luck Paul

 

[Bigtee]

Treat the poor thing to some new clean oil, get it up to temp then drain off & the torque converter too.