"The local tranny shop told me that I installed the sprag backwards??? I didn't think that was even
I would find a different shop.
If the transmission started working once I would suspect the valve body.
1st gear in D position uses the forward and O/R clutches.
2nd uses the forward clutch and intermediate band.
3rd uses forward and direct clutches.
Low uses the forward clutch and rear band. If the band is toast or slipping the O/R clutch will be used but the transmission will not have a hold back feature when the gas pedal is released.
Reverse uses the direct clutch and rear band.
If it locks up in L position either the intermediate band or direct clutch is too tight or being partially applied.