The return line is located directly behind the breather vent. This is the procedure we used at the transit agency to flush the bus transmissions. Just be careful ! Don't allow the transmission to run dry ! That would destroy your oil pump in a heart beat !
Since I'm pretty sure you don't have...
To much "governor" pressure. Your using "modulator" pressure to counter-act the high "governor" pressure when you hold the pedal to the floor.
The governor weights could be sticking. Take it apart and clean it real good.
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