• TCC apply & release concerns
  • TCC codes & concerns
  • TCC shudder


Bore and/or piston wear in the signal damper can allow TCC signal oil pressure to be exhausted, preventing correct TCC apply.


Sonnax drop-in TCC signal damper piston kit corrects this circuit pressure variation by replacing the worn OE damper without the need of modifying the valve body.


TCC Signal Damper Piston Kit
Part No. 105740-07K

You need this if... View Instructions Find a Distributor

TCC signal dampers are used in Ford 10R140 transmissions to dampen or smooth out the signal fluid pressure applied from each control solenoid before the fluid flows to the TCC control valve. This allows for a smoother apply of the converter.

When the bore and/or piston wears out, it cannot effectively dampen the variation in pressure. This can result in TCC apply and release concerns, TCC codes and overheating and TCC shudder.

Replacing these worn out dampers can require replacing the entire control valve body, or reaming the bore and installing an oversized piston.

Sonnax TCC signal damper piston kit 105740-07K includes an O-ringed sleeve to allow a long-lasting, quick repair, no reaming required. The O-ring provides a positive seal against critical pressure loss even in worn bores.

  • Hardcoat anodized aluminum piston combats premature wear
  • Annular grooves added to the piston reduces wear rate
  • Highly wear-resistant sleeve to prevent future wear
  • O-Ring provides positive seal to prevent critical pressure leakage in worn bores
  • Mating spring to re-establish OE dampening action
  • Drop-in Zip Valve™ parts install quickly and easily
Learn More About Zip Valve™ Drop-In Repairs
  • Piston
  • Sleeve
  • Spring
  • O-Rings (2) 1 Extra

  • 10R140 TCC Signal Damper Piston Kit 105740-07K
  • 10R140 TCC Signal Damper Piston Kit 105740-07K

You need this if...

10R140 TCC Signal Damper Piston Kit Vacuum Test Locations