700R4 4L60E Smart Shell-Heavy Duty Reaction Shell Kit. Sonnax 77749-02K

$ 204.00

SKU: 77749-02K, TS S74624SS, Categories: , , Tags: ,


Smart Shell – Heavy Duty Reaction Shell Kit. 700R4, 4L60E

Sonnax 77749-02K

Heavy Duty Reaction Shell

  • Enclosed Thrust Bearing
  • Custom Roller Clutch Race

In GM 4L60, 4L60-E, 4L65-E and 4L70-E units, bulky aftermarket shells always fall short when splines continue to strip and the shells break under stress. A chronic problem with both OE and thicker aftermarket shells is failure of the rear planetary bearing. From daily jobs to extreme builds, the Sonnax SmartShell heavy-duty reaction shell kit 77749-02K is the only way to prevent shell failure AND protect the bearing.

The SmartShell avoids the weight found in traditional, heavy-duty aftermarket shells thanks to a unique combination of improved design and manufacturing for a super strength shell that’s only slightly bulkier than OE. To prevent thrust loads from overwhelming the captured planetary bearing, the SmartShell features a larger bearing and custom roller clutch race. These parts re-route thrust loads through the carrier, completely bypassing the delicate bearing.

  • Stops spline stripping
  • Prevents hub breakage
  • Eliminates planetary bearing failure


Additional information

Weight 6 lbs
Dimensions 10 × 10 × 9 in