[TX Pony Killer]

I wonder if anyone has had the issue i am having now:

I took my car in to have the 2nd gear synchos as well as carbon rings put in for 3rd and 4th gear. After I got it back, 4th gear was grinding terribly. So I took it back, they replaced 4th gear, 4th gear synchos, and the input shaft (apparently some teeth had been damaged).

Now 4th gear is fine, but 3rd gear is now grinding, but it's only grinding on a downshift (i.e. I am stuck in traffic and have to shift down to keep from slugging: no hard downshifts).

I have looked the invoice over, and they seemed to do everything required including using shims to adjust preload. Is my dealership just incompetent or could there be a different issue?

Any input is appreciated. I am moderately mechanically inclined and have read every thread about the tr6060 that's here, so I am up to date on the goings on.