The South Bend heavy duty input upgrade kit is designed for use in the NV4500 transmissions, this kit includes the larger 1-3/8" input shaft found in the later NV5600 transmissions. These shafts are a direct replacement featuring a special Cryo treatment for added strength and durability.
Important Note:
This input shaft upgrade is specifically for use with aftermarket clutches that accept the larger 1-3/8" input shaft and is built specifically to be used with the NV4500 transmission.
Features & Benefits:
- Increased Strength & Durability
- Direct Replacement For The Standard 1-1/4" Shaft
- Larger 1-3/8" Input Shaft & Install Kit Included
- Cryogenically Treated For Breakage Resistance
- Allows Use Of Aftermarket Clutch Kits Designed For The 1-3/8" Input
- Fits the NV4500 Equipped 5.9 Cummins Pickups
