Sonnax 74602-01K Heavy Duty Reaction Shaft Kit for GM 4L60 4L60E 4L65E 4L70E 700R4

The Sonnax 74602-01K Heavy Duty Reaction Shaft Kit is engineered to solve common failure issues in GM 4L60, 4L60E, 4L65E, and 4L70E automatic transmissions used in high-torque applications and heavy vehicles. This premium upgrade replaces weak OE and aftermarket reaction shafts that suffer from spline twist and wear.

Key Features:

• Constructed from high-strength chromoly steel alloy for superior durability versus plain carbon steel OE parts
• Eliminates spline twist on rear planet engagement and spline wear on ring gear engagement
• Universal fit design works with all years and all input carrier styles including four-pinion, five-pinion, and six-pinion carriers
• Complete kit includes reaction shaft with bushings, shaft-to-shell bearing, shaft-to-front carrier bearing, and shim
• Compatible with early 700-R4, 4L60-E, and 4L65-E units as well as late-style 4L60-E and 4L70-E carriers with lip-style bearings

This professional-grade replacement is ideal for performance builds, heavy-duty applications, and transmission rebuilds where reliability and longevity are critical. The included bearing and shim combination ensures proper fitment across all carrier configurations. Replaces OE part numbers 19369220, 19356510, 24236094, 24241255, and 24222756.