1991 GT transmission trouble

[Many Crows]

So happy to have found this forum.
I blew my manual transmission last week and my mechanic found me a used one and installed it. Since then I am having two recurring problems. About half the time I engage first gear, I get either a clunk or a thunk. The thunk is not as loud as the clunk. A few times I have attempted to shift from 5th down to fourth or neutral and it seemed to catch on something, and I had to fight with it. My mechanic fiddled with it for an hour yesterday but both symptoms are still present.
He now intends to drain something called a master cylinder. I don't have a good feeling about this transmission and would appreciate any input.


Thanks, Many Crows

[92EscrtPmp]

I guess he thinks the clutch isn't engaging, and plans to do a pressure check on the Master Cylinder, (The big round thing going into the dash and has a resovuir on it for the brakes) Probably the wrong answer. My 92 SEFI LX did the same thing right before I lost every gear short of 4th?!! don't ask me, I'm not a mechanic, but if you have the 1.9 EFI HO Motor, you have the same Tranny as mine. Trust me, I've looked it up. I'd say it'sa faulty Tranny, Sorry.

[Many Crows]

Thank you

My engine is the 1.8. As far as *I* can tell the clutch is engaging perfectly (considering I just put a new one in 3 weeks ago). Since my first post it has now clunked going into reverse. I fear your diagnosis may be correct, but of course, am hoping for the best.
I can't help but wonder if the clutch work 3 weeks ago may have been a precurser for this problem.