904 Governor failure?
Tailshaft on the 71 Dart took a crap at the last race. Looks like the governor came apart. It is not used by the Reverse Manual Valve body.....The Transmission was scheduled to be replaced after that weekend but I guess it decided it had enough.
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I was talking with a friend of mine about this failure, and his opinion is that with a manual shift valve body, there is no hydraulic pressure or fluid in the governor to control the motion of the weights inside of it. He says the weights in an automatic have controlled pressure on both side of the weights stabilizing there movement.
When switching to manual shift the weights are free to flop around uncontrolled and will fly outwards from centrifugal force. Given the right circumstances there could have been enough force to overcome the small e clips and the weight would dislodge from there bores with great force. Probably threw it right through the case.
The moral is he says is when switching to a manual shift you should at a minimum remove the weights. If you are contemplating the switch to the a & a aluminum spacer you should probably get the aluminum parking gear as well to maintain assembly balance.
The factory parking gear and the governor are a balanced assembly with the parking gear having extra material on one side to offset the heavier on one side governor weight.
I made an aluminum spacer for use with a stock parking gear, but I had to zero balance the parking gear.
Just trying to help with this suggested info.
There are pics in my profile of my spacer and parking gear.