A833 Can't Downshift / Poor Performance

What clutch have you got in it? If it's a diaphragm clutch, did you remove the over center spring? They are only used on the Borg and Beck three lever style and need to be removed for the diaphragm style. That can cause some issues too.

Thanks, it's a diaphragm clutch and the over-center spring has been removed.

Additional information: this transmission is replacing my old one, which shifted and operated just fine, but had a lot of miles and was worn-out. The pilot bushing, clutch, shifter, shift arms, shift rods, driveshaft, flywheel all have less than 1000 miles on them.

@67Dart273 Thank you, I'll try adjusting it again tomorrow. I saw elsewhere (on another post on FABO) that if the driveshaft spins freely with the car in gear, clutch in, and tires in the air, it should be good, or at least very close. I'll crack out the Ye Olde feeler gauges and pull the inspection cover tomorrow to confirm.