48 windsor- No Shift

[48Windsor]

Well, I got my manual finally. Been going through the Fluid Drive diagnostics. Everything has checked out until I got the   governor switch is not opening. Can this be looked at with the governor on the tranny?? I assume there are some points stuck or not making.?? Tomorrow I'll trace the wire for continuity first, to make sure its ok. I did go ahead and replace the 10w oil in the tranny since I was there anyway. On to more testing.

Tom B

[Tom Skinner]

Tom B,

All good things to do. also check to see if your RPM's are down (say 450-475) low enough to allow for the Upshift.

I assume your not Upshifting. also check the Fuse in the Corner of your Transmission Relay Box and be sure it is not burnt.

Tom S.

[rb1949]

Compare your manual to the one for the Fluid Drive: http://www.imperialclub.com/Repair/Lit/Master/012A/cover.htm 

Yes you can remove the Governor Cover to check/clean points, PROPERLY. The unit just unscrews to test off the car. That old wiring is always questionable, so I just made a new harness and replaced it. Good luck figuring it out.

[48Windsor]

Tom S - thanks, checked all that. rb1949 - Thanks - heard that site mentioned somewhere before. Their info is better in some ways than the manual I bought. Will look at putting in new wires. Since its a driver, don't need original looking harness. 

Tom B

[Tom Skinner]

Tom B.,

Not trying to get you to spend money, however, F.Y.I. on ebay (1948 Chrysler Governor, Kickdown, and Selenoid) Tranny parts for sale in one lot.

I personally think it is probably your wire harness or just dirty or low Tranny Oil and Filter, or dirty Governor points. But for you guys that like extra parts.

Your Choice. Good Luck, it is probably a simple wire fix.

Tom S.

[48Windsor]

Tom, thanks for the heads up on the parts. I 'm hoping I don't have to go there but knowing my luck, who knows. 

Man that wiring is brittle after 70 years. Can't hardly touch without the insulation falling off! 

Tom B

[1949 Wraith]

Here are a couple  Youtube links for our transmissions and fault diagnosis 

 

Edited February 4, 2017 by 1949 Goat

[Dodgeb4ya]

The 1946 thru 1948 factory mechanics service book A-1 on the Chrysler and DeSoto M-5 Hydraulically Operated  transmission...... diagnostics booklet only..

There is also another special "A"  M-5 transmission booklet .... which describes "Operation"

I have shown pictures of these special Service books and below is an online service booklet A-1 link you can look at,

http://www.imperialclub.com/~imperialclub/Repair/Lit/Master/012B/index.htm

The above info is for a 1949 Std trans and the 1949 and later M-6 transmission which is different than your M-5 trans.