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Sonnax SmartShell Heavy Duty Reaction-Sun Shell Kit - 77749-02K
Sonnax SmartShell Heavy Duty Reaction Sun Shell Kit - 77749-02K
Stripped or cracked shells in GM 4L60, 4L60-E, 4L65-E and 4L70-E units are a common problem, but strengthening the shell alone does nothing to address the equally common problem of a failed rear planet captured bearing. The Sonnax SmartShell 77749-02K is a heavy duty Reaction Sun Shell kit designed to prevent damage to the rear planetary assembly as well as provide a reinforced shell
Protecting the Planetary Bearing:
In the OE sun gear shell, the thrust load passes from the shell through the sun gear, then overloads the small captured planetary bearing. To protect this bearing, Sonnax took the smart approach and replaced the OE black plastic washer with a large thrust bearing and roller clutch race. This re-routes the thrust load directly to the carrier, completely bypassing the delicate bearing
Strengthening the Shell:
The SmartShell avoids the substantially increased weight found in other aftermarket shells. The Sonnax approach to improving the shell includes reinforcing the hub area with an electron-beam welded collar. A final machining process after welding ensures precision alignment. The SmartShell splines undergo an advanced machining and heat-treating process, and the lugs which engage the drum are heat treated as well to avoid flaring
4L60E 4L65E 4L70E 700R4 - Kit Includes:
Heavy Duty Reaction-Sun Shell
Enclosed Thrust Bearing
Custom Roller Clutch Race
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Sonnax SmartShell Heavy Duty Reaction Sun Shell Kit - 77749-02K
SmartShell Heavy
Duty Reaction Sun Shell

Sonnax SmartShell Heavy Duty Reaction Sun Shell Kit - 77749-02K

Additional Information:
  • Click to view (Sonnax SmartShell®):
  • Fix 4L60 series sun gear shell problems with BRAINS, not just brawn. The SmartShell is the first and only upgrade that protects the planetary assembly and also provides a reinforced shell...................
Size and Weight:
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Sonnax Parts
406 East Park Ave
Enterprise, Alabama 36330