Printpartsummary
Symptoms:
  • 3rd Slip
  • 4th Slip
  • Direct clutch burned
  • Gear ratio codes
  • No Reverse
  • Reverse slip
Cause:

Excess wear in Reverse checkball sleeve prevents proper application of direct clutches.

Correction:

Restore hydraulic control and prevent premature wear by installing upgraded material Sonnax Reverse checkball sleeve.

4L80-E, 4L85-E

Reverse Checkball Sleeve

Part No.

34200-38

Reverse Checkball Sleeve
  • 34200-38-in_combo

  • Reverse Checkball Sleeve

Small_34200-38-in_combo Small_34200-38

4L80-E, 4L85-E

Reverse Checkball Sleeve

Part No. 34200-38

Package Quantity: 4

Fits units '95-later.

Complaint:

  • 3rd Slip
  • 4th Slip
  • Direct clutch burned
  • Gear ratio codes
  • No Reverse
  • Reverse slip

Cause:

Excess wear in Reverse checkball sleeve prevents proper application of direct clutches.


Correction:

Restore hydraulic control and prevent premature wear by installing upgraded material Sonnax Reverse checkball sleeve.

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 checkball becomes compromised and results in loss of apply pressure to direct clutches. Consequences of this pressure loss are slipping or no 3rd, 4th, and Reverse gears, burnt direct clutches, and ratio codes.

Installing Sonnax Reverse checkball sleeve 34200-38 restores the hydraulic integrity of this circuit to reestablish normal shift operation and performance.

  • Sleeve is manufactured from highly wear-resistant aluminum for maximum life
  • No reaming or special tools required

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.

  • Test Locations

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Contact a Sonnax Distributor to purchase this part.