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4L60 / 700R4 THIS NEW INPUT SHAFT SOLD WITH A NEW SONNAX INPUT DRUM REINFORCEMENT KIT #77733-01K IS DESIGNEDTO HOLD UP TO EXTREME HEAVY DUTY AND HIGH PERFORMANCE APPLICATIONS WITH OUT BREAKAGE. THE SHAFT IS MACHINED FROM 300M STEEL MAKE GM MODEL 4L60 / 700R4 YEARS Late 1987 - 1993 DETAILS THIS INPUT SHAFT HAS 30 SPLINES WITH A SMOOTH PILOT TIP ON THE END TO BE USED WITH THE "298mm" TORQUE CONVERTERS. FITS V-8 AND 6 CYLINDER ENGINES, EXCLUDING 2.8L. MACHINED FROM 300M STEEL THEN HARDENED. THIS SONNAX KIT IS USED TO REINFORCE THE ALUMINUM HOUSING OF THE INPUT DRUM AROUND THE INPUT SHAFT AREA TO PREVENT CRACKING AND BREAKAGE UNDER EXTREME USAGE. THIS KIT WILL NOT FIX A DRUM WITH A CRACKED HOUSING!!!  IF YOUR HOUSING IS CRACKED, YOU MUST REPLACE THE DRUM PRIOR TO INSTALLATION OF THIS KIT. ********NOTE******** TO INSTALL THIS SONNAX UPGRADE KIT, YOU MUST USE THE EARLY STYLE CAST ALUMINUM FORWARD PISTON AND THE EARLY STYLE FORWARD RETURN SPRING WITH A RETAINER ON ONLY ONE SIDE. LATE MODEL TRANSMISSIONS WITH A STEEL, MOLDED RUBBER PISTON AND DUAL RETAINER STYLE RETURN SPRING MUST BE RETRO FITTED BACK TO THE EARLIER DESIGN!!!!! THESE PARTS ARE AVAILABLE. PLEASE EMAIL WITH ANY EXTRAS YOU MAY NEED TO COMPLETE THE JOB AND WE CAN ADD THEM TO YOUR ORDER. WE MANUFACTURE CUSTOM OFF ROAD RACING AXLES MADE FROM 300M STEEL. THESE SHAFTS ARE MADE TO ORDER BASED ON THE SPECIFIC DIMENSIONS OF YOUR RACER. PLEASE EMAIL THE SPECS OF YOUR AXLES AND WE CAN CUSTOM BUILD EXACTLY WHAT YOU NEED FOR YOUR VEHICLE. All items sold are new and inspected to be guaranteed free of defects in manufacturing. New, uninstalled items returned in their original, un-opened packaging will be accepted for refund less actual shipping costs, if returned within 14 days of receipt of item. Any opened or installed part will not be accepted for refund. Upon receipt of order, please inspect all items and immediately contact us should there be any application questions or issues so we may continue to maintain 100% customer satisfaction. Thank you for your business!!!

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