6HP28, 6HP28X

Symptoms:

• Broken parts due to excessive line pressure
• Excess heat
• Firm shifts
• Flare shifts & bind-ups
• Delayed engagement
• Harsh engagement

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

Correction:
Zip Kit seals critical pressure losses and restores and extends accumulator action.

The Sonnax Zip Kit targets the root cause of multiple complaints by sealing the critical circuit pressure losses in listed valve bodies. The kit contains uniquely designed parts to prevent the loss of pressures within the main line, solenoid regulator, reverse, clutch control and solenoid apply circuits with no special tools required.

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 general rebuilding tips and technical information, the technical booklet included in this kit contains vacuum testing and additional repair options for higher mileage units or for repairing specific complaints which are beyond the scope of this kit.

• No reaming required
• Installs quickly with no special tools required
• Uniquely designed parts address root causes of valve body complaints by sealing critical pressure circuits
• Detailed technical booklet included with in-depth rebuild and inspection tips for comprehensive valve body repair

Note:
This Zip Kit ZF6-GEN2-ZIP is designed for ZF6HP21/28/34 (Generation 2) applications only. 

Contents:

• Accumulator Piston Kits (7)
• Testing Nut
• Testing End Plug
• Pressure Regulator Sleeve
• O-Ringed Internal End Plug Kit
• Replacement Solenoid O-Rings 31 Pieces, 5 Sizes
• O-Ringed End Plug Kit
• Clutch A & E Control Boost Valve Kit (2)

SONNAX Installation Instructions