• Delayed engagement
  • Poor line pressure control
  • Erratic shifts
  • Poor lube oil control
  • Overheated converter
  • Buzzing noise
  • Lost or damaged component


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


Zip Kit seals critical pressure losses and restores normal shift operation. The included separator plate ensures you bring the valve body back to the correct operation. Drop-in parts install quickly and easily.


Zip Kit ®
Part No. 48RE-ZIP

View Instructions Find a Distributor

Sonnax Zip Kit 48RE-ZIP targets the root cause of multiple complaints by sealing the critical circuit pressure losses in Chrysler 48RE valve bodies. The kit contains uniquely designed parts to prevent the loss of pressures and brings back normal shift operation. This kit also uniquely provides a new OE separator plate to ensure correct operation. 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 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.

  • Drop-in Zip Valve™ parts install quickly and easily, no reaming or special tools required
  • Uniquely designed parts address root causes of valve body complaints by sealing critical pressure circuits
  • Includes new OE separator plate to ensure your rebuild will undo past alterations and bring it back to proper operation
  • Detailed technical booklet included with in-depth rebuild and inspection tips for comprehensive valve body repair
Learn More About Zip Valve™ Drop-In Repairs

  • Line Pressure Plug & Sleeve Kit
  • Throttle Valve Kit
  • 4-Spool Switch Valve Fits Units with 4-Spool Valve
  • Pressure Regulator Valve Fits '78-Later Units Only
  • Manual Valve
  • E-Ring
  • Boost Valve Spring Retainer
  • 3-4 Accumulator Spring
  • 4th Accumulator Seal
  • 4th Accumulator D-Ring
  • Checkballs (10) .250" Dia.
  • Checkball .344" Dia.
  • Checkball .188" Dia.
  • Intermediate Plug & Pilot Kit
  • Output Pilot Bushing
  • Governor Bore Plug Kit
  • Turbine Shaft Seals (2)
  • Valve Body Separator Plate
  • 48RE Zip Kit ® 48RE-ZIP
  • 48RE Zip Kit ® 48RE-ZIP details
Sonnax Zip Kit

The Sonnax ZIP KIT®

The First Step in Correcting Common Shift Problems

It's easy to restore and extend vehicle shift quality with Zip Kits. Uniquely designed, drop-in Sonnax parts target the root cause of valve body complaints and stop critical circuit pressure losses in the most common problem areas of the transmission.

Learn More About Sonnax Zip Kits