4L60 4L60E 4L65E 4L70 Transmission Sonnax Input Drum Reinforcement Kit 77733-51K

OE Spec or Performance/Custom: Performance/Custom Other Part Number: Superduty, 4l60E heavy duty, transmission Items Included: Reinforcement Sleeve, Custom Overrun Piston, Piston Seals Manufacturer Part Number: 77733-51K Superseded Part Number: 1500, 2500, transmission parts, transmission HP  Vintage Part: No Placement on Vehicle: Front Brand: Sonnax Type: High Performance Input Drum Kit Core Charge: no Interchange Part Number: 7773351K, GM transmission, Heavy duty, HP, Shift Manufacturer Warranty: 6 Month Surface Finish: new sleeve and aluminum piston Country/Region of Manufacture: United States Universal Fitment: Yes Performance Part: Yes 4L60, 4L60-E, 4L65-E, 4L70-E Transmission Input Drum Reinforcement KitPart No. 77733-51K The GM 4L60, 4L60-E, 4L65-E and 4L70-E input drum assembly is known to crack and strip out splines where the input shaft is pressed into it (where the overrun piston rides). Sonnax offers a hardened steel sleeve that reinforces the input drum to prevent