we replaced and engine in a 2003 chevy trailblazer but now wont shift in reverse or drive
Sounds like the engine was not properly reconnected to the transmission. That's where I'd start with troubleshooting.
how so even if its running ok
The engine will run fine even though the transmission is not properly connected to the motor.
thank you for your time i think its a pump in the tranny
Looking for a Used TrailBlazer in your area?
CarGurus has 4,466 nationwide TrailBlazer listings starting at $899.
Search Chevrolet TrailBlazer Questions
Chevrolet TrailBlazer Experts