I have a 69 M20 3925660 case 3857584 tail 3884685 side cover P9T02A vin 19L512226 apparently i have the wrong side cover and someone has changed the reverse shifter fork because they all have the threaded shafts. can anyone pin down the production week or day of the vin build? I guess I'll have to get the correct parts to put it back the way it should be.

It was built December 2, 1968. It should be an M20 wide ratio.

http://www.camaros.org/numbers.shtml#TransmissionNumbers