Need 4-speed Help

First the good news... Received my new McLeod pressure plate from Brewers last week. Got everything torn down, reassembled, and went to test.

Now the bad news... Still have the original problem! There's good linkage adjustment with play when clutch is fully released, but with the car on jack stands, shift trans into 4th gears, release clutch, and rear wheels turn. Put on e-brake, engine RPMs drop, rev engine, and the squealing noise (Somewhat high pitched and tinny sounding). So, have now ruled out a bad pressure plate, but not sure what else to try.

Beginning to suspect the tranny again. I've just come fully circle...