Can anyone explain what controls the shift points in the OD transmission of my 4.3L '89 s10? The shifting has become very harsh and at elevated rpm since I replaced a blown head gasket. I freely admit to possibly misconnecting something ... but what would cause the shift points to change dramatically like this?
Finally, can anyone suggest a better shop manual to use with this truck than the Chilton's I have?
Thanks,
Peyton