57 thunderbird

[lignell]

It seems that the overdrive in my thunderbird is not working any thoughts

 

[Dobie Gillis]

With the cable pushed in does it freewheel when you let off the gas? We need more info to help diagnose it.

 

[lignell]

yes

 

[Dobie Gillis]

OK, that means the freewheeling clutch works. Do you hear the relay and solenoid click when you get over about 28 to 30 mph?

 

[lignell]

yes

 

[Dobie Gillis]

To confirm the solenoid is functional attach a long jumper wire to the solenoid terminal on the relay with an alligator clip. Touch the other end of the jumper to the battery + post. You should hear the solenoid click underneath the car.

Here's a link to the official Borg Warner operator's/troubleshooting/repair manual. Ignore any reference to a reverse lockout switch, it was deleted early in 1951 in favor of a shift rod inside the transmission that locks out the OD when reverse gear is selected.

http://www.oldcarmanualproject.com/manuals/trans/Borg-Warner%20Overdrive/index.htm

 

[lignell]

thanks for all your assistance

 

[Dobie Gillis]

No problem.