93 jgc 5.2 Trans Problems/Mechanic @ fault?

I recently brought my full time quadra trac JGC laredo 5.2, 151,000mi. in for a basic tune up/ check-up at a local repair shop. The mechanic found that the front diff was shot, so he removed some torn up pieces, disconnected something that made my jeep 2wd only. He said this would not hurt the transmission none. He also changed the gasket and tranny fluid from the pan (aprx 3 quarts). When I got the car back, after a day or two with low miles driven, I heard funny metal grinding and sweaking. It sounded like gears with no lubrication getting ruined. I checked my Tranny fluid, and it was barely showing on the stick. I added three quarts before the level was right. There were no leaks or puddles under the car, leading me to believe that the mechanic forgot to add the tranny fluid after he did the gasket. I brought it back a day or two after that because the tranny had started slipping. Naturally, they said it was the Tranny, and that it had nothing to do with the front diff or the three quarts it was missing, and it was coincidence that this happened immediatly after getting the car back. Any ideas about this? How can I go about getting them to make good on this?

Iw ould say it is deffinately the lack of fluid wich caused the prob. it prolly burnt some of the clutch packs in the tranny, and I would take it to a trnnay specialist and ask them about it.

I need a pic of the Vacuum Harness that connects the EGR Valve, Throttle body, Intake Manifold, Purge Solenoid, etc.... to the EVAP Canister ( it is a 2pc. harness, i do not need the half that runs back to the EVAAP CANISTER itself just everything b4 it.) from a 93 or 94 5.2L please help. had incedent an burnt up all my vacuum lines.