Sonnax 8L45-8L90-SHIFT-ZIP, 8L45 / 8L90 Shift Zip Kit®

$ 190.00


SKU: SX 8L45-8L90-SHIFT-ZIP, a8 rb b5 Categories: , Tags: , ,


8L45 / 8L90 Shift Zip Kit, Sonnax 8L45-8L90-SHIFT-ZIP.

Sonnax Shift Zip Kit (8L45-8L90-SHIFT-ZIP) targets the root cause of multiple shift-related complaints. Generally, by sealing the critical circuit pressure losses in the GM 8L45 and 8L90 valve body. Additionally, the kit contains uniquely designed parts to prevent the loss of pressures within the signal accumulator, clutch control and 1-3-5-6-7 accumulator piston circuits. Also, these solutions target wear that results in multiple shift quality complaints and burnt clutches. Lastly, no 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 fast. In addition to this, the technical booklet included in this kit contains vacuum testing information and locations at other key areas of the valve body.

  • Drop-in Zip Valve parts install quickly and easily, consequently, no reaming or special tools are required
  • Uniquely designed parts address root causes of shift complaints by sealing critical pressure circuits
  • Detailed technical booklet included with in-depth rebuild and inspection tips for comprehensive valve body repair


  • S1/S5 Clutch Control Valve Kit Fits 1 of 2 locations
  • S2/S3/S4/TCC Clutch Control Valve Kit Fits 1 of 4 locations
  • 1-3-5-6-7 Accumulator Piston Kit
  • Signal Accumulator Pistons, Sleeves, Springs, End Plugs, and O-Rings (7)

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Additional information

Weight 1.5 lbs
Dimensions 8 × 8 × 3 in

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