Symptoms:

  • 3rd Slip
  • 4th Slip
  • Gear ratio codes
  • Direct clutch burned
  • Reverse slip

Cause:

Excess wear in 3rd and Reverse checkball sleeves allows valuable oil loss or cross leakage.

Correction:

Restore hydraulic control and prevent premature wear by installing upgraded material Sonnax 3rd and Reverse checkball sleeves.

4L80-E, 4L85-E

3rd & Reverse Checkball Sleeve Kit
Part No. 34200-47K

Fits units '95-later.

You need this if... View Instructions Find a Distributor

Vehicles with '95-later GM 4L80-E and 4L85-E transmissions commonly exhibit wear in the Reverse checkball sleeve located in the 3-4 shift valve bore. This issue is caused by normal movement of the checkball within the sleeve over time.

As wear progresses, sealing function of the checkball becomes compromised and results in loss of apply pressure to direct clutches. Consequences of this pressure loss are slipping or no 3rd and 4th Gears, burnt direct clutches, and ratio codes.

Installing Sonnax 3rd and Reverse checkball sleeve kit 34200-47K restores the hydraulic integrity of this circuit to reestablish normal shift operation and performance. Kit components are manufactured from high-strength, wear-resistant aluminum for added durability.

  • 3rd Checkball Sleeve
  • Reverse Checkball Sleeve
  • O-Rings (2) 1 Extra

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

GM 4L80-E, 4L85-E, 400 Valve Body Layout

GM 4L80-E, 4L85-E, 400 Valve Body Layout
  • 4L80-E, 4L85-E 3rd & Reverse Checkball Sleeve Kit 34200-47K
  • 4L80-E, 4L85-E 3rd & Reverse Checkball Sleeve Kit 34200-47K

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg., or if wear is visually detected.

4L80-E, 4L85-E 3rd & Reverse Checkball Sleeve Kit Vacuum Test Locations