Re: {Chrysler 300} '56 Powerflite reverse

know about this !!! in a 57 — may not be what you think . caused me a lot of aggravation in and out 3 times no cigar new valve body even

The reverse block out function prevents engaging reverse over ? 5 mph This is a pin that jumps out inside — if car is moving, blocks reverse valve . However : the pin is moved out of away when gov pressure drops to zero . ( stopped)

HOWEVER , due to bad luck and bad fits in gov or springs , some gov do not return to zero , leaving the pin out, ( depends——) blocking R Notice nothing is obviously wrong in trans..

After figuring this out, (by thinking) ( I should have put gauge on gov, long hose and drive, admit I did not, = follow diagnostic directions ) .

I Found this description in 56(?) powerflight manual, not in the TF manual— go chrysler , dropping stuff they told you last year)

After going to car( this is for me ) anyway, —I discovered “ put in D first , then with no rush, but rapid motion push R .it goes in . “ Valves do not have time to switch around I think you are in R before pin comes out . !

While a little PIA to do this , and defeats the normal dude, not taking it out for 4 th time , and then trying to find a good real 300 governor ( right — and how to tell ?) lot of work .

Din V may know a lot more about gov issue

hope it helps, wish I knew this info in the way back Has worked ok

No Santa it is NOT cable adjustment

On Dec 20, 2025, at 2:34 PM, aswygart@xxxxxxxxxx wrote:

I've struggled with my 300B not going into reverse until well warmed up for quite some time. I recently found this service bulletin online regarding this problem, and sure enough, the button and cable easily work the reverse when not running, so I apparently have an issue with the reverse governor pressure, Unfortunately, I think I have damaged the torque converter from too many attempts to get it in reverse from drive.

Tony Swygart- Ohio

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