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> Volvo 740 Glt (1990) Overdrive Problem, Cannot always engage overdrive
post Oct 23 2020, 10:59 AM
Post #1


Group: Members
Posts: 1
Joined: 23-October 20
Member No.: 251,345
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Location: Scotland
Drives: Volvo 740 GLT

I am having trouble engaging overdrive, it works when the car is cold and the transmission oil has not heated up. Once the car is heated up, I cannot engage it. I have tried changing the solenoid but this has no effect, I think it must be a thermal problem. Gearbox oil has never been changed since new (I have had the car from new), would changing in solve the problem? I know Volvo at this time used a Laycock overdrive unit which was bolted on to the gearbox, does this share the main gearbox oil or does it have its own supply? Any help would be much appreciated, the B234F engine is a delight but I would feel better cruising on motorways with the overdrive engaged!
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