The vehicle may come into the shop slipping in third gear, upon disassembly of the transmission the direct clutch is found to be badly burnt. Further disassembly reveals the bottom of the 2-3 accumulator piston has blown out, refer to figure 5.
The damage to the 2-3 accumulator piston will allow forward clutch oil into the direct clutch circuit, refer to figure 6. This will partially apply the direct clutch causing it to burn.
Replace the 2-3 accumulator piston.
1997 & Up 4R75E 2-3 Bonded Accumulator Piston — F7AZ-7H292-AB