Transmission Parts

Browse all Sonnax transmission parts here, or use the filters below to find just what you are looking for.

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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

View Sonnax Part Instructions

Enter a Sonnax part number below to view its instructions. For general reaming instructions, click here.

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

8L45 • 8L90

Shift Zip Kit® 8L45-8L90-SHIFT-ZIP

For shift-related complaints.

    Helps cure:
  • Poor shift quality
  • Burnt clutches
  • Flare shifts
  • Soft shifts
  • Clutch slippage
  • Low line pressure
  • Ratio codes
8L45, 8L90 TCC Zip Kit® 8L45-8L90-TCC-ZIP

8L45 • 8L90

TCC Zip Kit® 8L45-8L90-TCC-ZIP

For converter-related complaints.

    Helps cure:
  • TCC apply & release concerns
  • Overheated transmission & converter
  • Loss of cooler flow
  • Loss of lube oil
  • Burnt converter
  • High TCC slip RPM
  • Code P0218
  • Code P0741
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