GMC Junkie,
If you follow the shift linkage to the transmission, there is a 1/2" diameter shaft that the linkage connects to on the outside of the shaft. The shaft
goes from the outside of the transmission to the inside where it shifts the valve. The shaft is sealed by a pressed in lip seal.
I can fax you a couple of pics of the shaft and seal if you like. They are in a transmission manual and it shows removal of the seal, outside view and inside view of the shaft and linkage.
Jim
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