PIP5926

Bulletin No.: PIP5926
Published date: N/A
Preliminary Information
PIP5926 Transmission Fluid Leak Between the Transmission and
Transfer Case
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
Chevrolet
Silverado 2500/3500
2020 - 2024
ALL
ALL
L5P L8T
MKM MGM MGU
GMC
Sierra 2500/3500
2020 - 2024
ALL
ALL
L5P L8T
MKM MGM MGU
Involved Region or Country
North America, Middle East, Israel and Australia/New Zealand.
Additional RPO
NQF NQH
Some customers or technicians may comment of a transmission uid leak between
the transmission and transfer case.
Condition
Cause
The Transmission Case Extension Seal (call out 1 second pic below) is leaking or
the Transfer Case Input Shaft Seal (call out 1 third pic below).
Correction:
Replace the Transmission Case Extension Seal (call out 1 second pic below) and Transfer Case Input Shaft Seal
(call out 1 third pic below).
Note: The cavity between the Transmission and Transfer Case is a wet cavity by design. The Transfer Case Input
Shaft Seal is a double seal to prevent uid transmission and transfer case uid from intermixing with each. If
either side of the seal leaks uid will leak from the weep holes between the Transmission and Transfer Case.
Adding dye to either the transfer case or transmission will help determine if the seal depth is incorrect.
If the seal is installed to deep the uid leaking is transmission uid.
If the seal is not installed deep enough the uid leaking is transfer case uid.
Either condition will cause uid to leak out of the weep holes between the transmission and transfer case.
MKM MGM MGU NQF NQH
Note: Review PIP5810B for proper Transfer Case Input Shaft Seal Installation Instructions. Improper Transfer
Case Extension Seal installation will result in repeat leaks.
Note: Follow the published t-case alignment bolt torque and sequence pattern during the installation process,
example reference in SI# 6283514, at the bottom of the page.
Note: For Model Year 2022 review PIP5857 for a possible Case Plug. Note the Case Plug issue should have
presented itself at low mileage.
** This PI will be updated to a TSB as more information becomes available. **
Version History
Version
Modi ed
1
06/07/2023 - Created.
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