It has to be a mechanical piece that has malfunctioned internally, or a stuck solenoid.
In nuetral, there is nothing happening in the valve body, park is held in place with a pin on the last drum inside at the rear or "end". Reverse - the rear clutch & rear band are applied. Although the Reverse & first gears use the same clutch drum, I am thinking there is something wrong with the rear portion of the internal parts of the transmission when this is selected - I.E. a part of the planetary gear set possibly.
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Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.
Mechanic - Bodyman - Fabricator - Pit chief
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