2000 Tacoma will not start

2000 Tacoma 4x4 3.4L V6
Truck started, reached to put in gear, stalled. Started sounded like it was grinding, replace started. New starter will not turn motor. I can reverse the crank pulley with a socket and bar to a certain point and then it will stop. Try starting engine after and it wil turn over like it wants to start but hits a certain point and stops. At this point I can not rotate the engine forward with the socket and bar on the crank pulley but I can reverse it and it will do the same thing again. Starter engages but will not rotate engine beyond a certain point.

 

is the motor locked?

 

I don't believe so. I can rotate the crank pulley back and forth one to one a quarter full turns. But both ways it hits a definite stopping point.

 

Maybe your starter is binding up with the flywheel Did the gears line up?

 

Yes, the gears lined up.