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SmartShell Heavy Duty Reaction Shell Kit Part number: 77749-02K Contents • 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 Sunshell HP Sonnax 4L60E Smartshell was added to your shopping cart. Shopping Cart » 77749-02K 74624HP Sunshell HP Sonnax 4L60E Smartshell