34322 02K IN

2018-09-17

: Sonnax 34322-02K-In 34322-02K-IN 4672 instructions part uploads

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PERFORMANCE
H I GH PE R FOR MANCE TRANSMISSIO N PARTS
Instructions

GM 400, 425, 4L80-E, 4L85-E

Extreme Duty
Forward
Clutch Hub Kit

Bearing

Part No.

34322-02K

• Bearing
• Hub

Hub

WARNING: Compared to OE or other replacement forward clutch hubs, this hub and bearing
combination has an additional .025" thickness designed-in to reduce endplay and provide
further endplay adjustment options.
NOTE: No machining is required for typical installation.
NOTE: This forward clutch hub and bearing combination shifts the support of the forward clutch hub
from the main shaft to the direct housing and sun gear shaft.
NOTE: Preassemble unit to check and set endplay before final transmission assembly.

Directions
a. Stack bearing and forward clutch hub onto direct clutch housing.
b. Place bronze washer on top of forward clutch hub.
c. Place forward clutch housing on top of bronze washer.
d. Install pump cover and gasket.
NOTE: For 4L80E, install necessary overdrive components to allow endplay check.

c. Check front end play. Ensure output shaft is pre-loaded forward when checking front
endplay. See front endplay selective washers and specifications (Figures 1 & 2).
d. I f endplay is too tight, material can be removed from following locations as needed.
• Front of direct clutch housing
• Rear of forward clutch hub
• Rear of forward clutch housing
©2018 Sonnax Transmission Company, Inc. • A Marmon / Berkshire Hathaway Company
866-243-8829 • 856-848-0908 • F: 856-848-1080 • www.sonnax.com

34322-02K-IN

09-10-18
Page 1

PERFORMANCE
H I GH PE R FOR MANCE TRANSMISSIO N PARTS
Instructions

EXTREME DUTY FORWARD CLUTCH HUB 34322-02K

Figure 1

4L80E Front Selective Thrust Washers
Thickness

Identification Color

OE #

INDUSTRY #

.123"

Black

8677575

34211HE

.107"

Green

8677574

34211HD

.091"

Brown

8677573

34211HC

.075"

Red

8677572

34211HB

.059"

Blue

8677571

34211HA

Front End Play Specification

.004–.022"

Rear End Play Specification

.005–.025"
Figure 2

THM400 Front Selective Thrust Washers
Thickness

Identification Color

OE #

INDUSTRY #

.130"

Purple

8623306

34211G

.117"

Black

8623305

34211E

.106"

Green

8623304

34211D

.095"

Brown

8623303

34211C

.084"

Red

8623302

34211B

.073"

Blue

8623301

34211A

Yellow

8623300

.062" **

34211

Front End Play Specification

.003–.024"

Rear End Play Specification

.007–.019"

**Check to ensure lube passage at rear of pump cover is not crowded by forward clutch housing.

©2018 Sonnax Transmission Company, Inc. • A Marmon / Berkshire Hathaway Company
866-243-8829 • 856-848-0908 • F: 856-848-1080 • www.sonnax.com

34322-02K-IN

09-10-18
Page 2



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