6T30 6T40 6T45 and 6T50 Transmissions. Generation 2 Sonnax Zip Kit Number 6T40-GEN2-ZIP

$ 248.00


  • Burnt clutches
  • Line pressure instability
  • Loss of fuel economy
  • No line rise
  • Pressure loss
  • Shift concerns
  • TCC apply & release concerns
  • TCC codes


Loss of oil pressure due to worn components in critical circuits.


Recover hydraulic control, restore normal shift operation and save the transmission control unit by installing Sonnax Zip Kit.


SKU: SX 6T40-GEN2-ZIP,(new sku 6T40-GEN2-3-ZIP) Categories: , Tags: , ,


6T30 6T40 6T45 and 6T50 Transmissions. Generation 2 Sonnax Zip Kit Number 6T40-GEN2-ZIP

Sonnax Zip Kit 6T40-GEN2-ZIP targets the root cause of multiple concerns by sealing critical circuit pressure losses in GM 6T30 and second generation 6T40, 6T45 and 6T50 valve bodies. The kit contains uniquely designed parts to prevent the loss of pressures within the main line, clutch apply control, actuator feed and lockup control circuits. The kit also seals multiple circuits known to suffer from end plug leakage or poor checkball sealing. No separate special tools are required for installing these parts.

The Zip Kit quick guide provides clear and easy instructions on one sheet to get the unit sealed up and back on the road quickly. In addition to general rebuilding tips and technical information, the technical booklet included in this kit contains vacuum testing information and locations at other key areas of the valve body.

  • End Plugs (5)
  • O-Rings (7) 2 Extra
  • TCC Regulator Apply Valve, Shuttle Valve, End Plug, Spring & O-Rings (2) 1 Extra
  • AFL Valve, Sleeve, Spring & Retainer Clip
  • Checkballs (6)
  • Drill Bit .062″ Dia. (Not shown)
  • Aluminum Plugs (2) .062″ Dia., 1 Extra (Not shown)
  • Simple parts install quickly with no reaming or special tools required
  • Uniquely designed parts address root causes of valve body concerns by sealing critical pressure circuits
  • Detailed technical booklet included with in-depth rebuild and inspection tips for comprehensive valve body repair


Additional information

Weight 2 lbs
Dimensions 8 × 8 × 3 in