Symptoms:

  • Pressure loss
  • Burnt clutches
  • Shift concerns
  • TCC apply concerns

Cause:

Worn end plugs allow vital actuator/solenoid feed pressure to leak from the various regulator valve bores. When the clutch select valve end plug leaks, reverse pressure is reduced or lost.

Correction:

Renew hydraulic control and restore critical circuit pressures by installing the Sonnax O-ringed end plug kit.

6T30 (Gen. 2), 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T40 (Gen. 2), 6T41 (Gen. 3 6T40), 6T45 (Gen. 2), 6T46 (Gen. 3 6T40), 6T50 (Gen. 2), 6T51 (Gen. 3 6T40)

O-Ringed End Plug Kit
Part No. 144510-14K

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

OE end plugs are designed to capture the valve train in the bore, retain critical oil pressure and function as a spring or valve stop. Repetitive spring movement, valve impacts and abrupt fluid pressure variations promote wear of the end plug circumference and bore I.D. surface, eventually allowing vital oil pressure to escape the circuit.

GM Gen. 2 6T30/40/45/50 and Gen. 3 6T35/31/41/46/51 valve bodies have end plugs at the various clutch regulator valve bores that are susceptible to the wear conditions described above. When actuator/solenoid feed pressure leaks out of the affected circuit, various shift concerns and burnt clutches will result. A worn TCC regulator end plug or clutch select valve end plug allows critical oil pressure loss leading to drivability complaints. Reduce or eliminate leakage and restore hydraulic integrity by installing Sonnax O-ringed end plug kit 144510-14K.

  • Minimal end-plug-to-bore clearance with added O-ring for positive seal
  • #8-32 threaded bore in end plug outboard face aids installation and removal
  • End Plugs (6)
  • O-Rings (9) 3 Extra

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

GM Gen. 2 6T30/40/45/50, Gen. 3 6T40 Valve Body Layout

GM Gen. 2 6T30/40/45/50, Gen. 3 6T40 Valve Body Layout
  • 6T30 (Gen. 2), 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T40 (Gen. 2), 6T41 (Gen. 3 6T40), 6T45 (Gen. 2), 6T46 (Gen. 3 6T40), 6T50 (Gen. 2), 6T51 (Gen. 3 6T40) O-Ringed End Plug Kit 144510-14K
  • 6T30 (Gen. 2), 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T40 (Gen. 2), 6T41 (Gen. 3 6T40), 6T45 (Gen. 2), 6T46 (Gen. 3 6T40), 6T50 (Gen. 2), 6T51 (Gen. 3 6T40) O-Ringed End Plug Kit 144510-14K

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

6T30 (Gen. 2), 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T40 (Gen. 2), 6T41 (Gen. 3 6T40), 6T45 (Gen. 2), 6T46 (Gen. 3 6T40), 6T50 (Gen. 2), 6T51 (Gen. 3 6T40) O-Ringed End Plug Kit Vacuum Test Locations