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Transmission TECH/TALK

Ford 4R75E Slipping in Third Gear

Complaint:

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.

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Figure 5 – Further disassembly reveals the bottom of the 2-3 accumulator piston has blown out.

Cause:

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.

Figure 6 – The damage to the 2-3 accumulator piston will allow forward clutch oil into the direct clutch circuit.

Correction:

Replace the 2-3 accumulator piston.

1997 & Up 4R75E 2-3 Bonded Accumulator Piston — F7AZ-7H292-AB

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