InMotion WS470380 Manual Transmission Input Shaft Seal - Rear

Manual Transmission Input Shaft Seal for GM 4-Speed Applications

InMotion WS470380 is a nitrile manual transmission input shaft seal built to maintain a tight barrier at the transmission opening. It helps keep contaminants out and fluid in, supporting reliable operation in older Chevrolet and GMC manual transmission applications.

Key Features

• Nitrile sealing material for dependable resistance to transmission fluid exposure
• Inside diameter: 1.5 in.
• Outside diameter: 2.378 in.
• Housing bore: 2.375 in.
• Thickness and width: 0.312 in.
• Direct-fit service part for select New Process 435GA and 435GL transmission applications
• Part number: WS470380

Detailed Product Overview

This InMotion transmission seal is engineered around precise dimensions to support a secure fit at the input shaft area. The nitrile sealing surface is selected for sealing performance in drivetrain service, while the measured shaft diameter and housing bore help ensure proper seating in the transmission case. InMotion WS470380 is a practical replacement choice for drivers servicing classic Chevrolet C10 Suburban, C20 Suburban, K10 Suburban, K20 Suburban, and GMC G15/G1500 or G25/G2500 Van models with the specified New Process 435GA or 435GL transmission. The part number WS470380 is also useful when cross-checking service records or ordering by reference.

Vehicle Fitment

• Fits 1968 Chevrolet C10 Suburban, with New Process 435GA Transmission
• Fits 1967-1968 Chevrolet C20 Suburban, with New Process 435GL Transmission
• Fits 1967-1968 Chevrolet K10 Suburban, with New Process 435GL Transmission
• Fits 1967-1968 Chevrolet K20 Suburban, with New Process 435GA Transmission
• Fits 1968 GMC G15/G1500 Van, with New Process 435GA Transmission
• Fits 1968 GMC G25/G2500 Van, with New Process 435GL Transmission
• Fits 1967 Chevrolet C10 Suburban, with New Process 435GL Transmission
• Fits 1967 GMC G15/G1500 Van, with New Process 435GL Transmission
• Fits 1967 GMC G25/G2500 Van, with New Process 435GA Transmission
• Fits 1966 GMC G1500, with New Process 435GL Transmission
• Fits 1964 GMC G1500, with New Process 435GL Transmission
• Fits 1965 GMC G1500, with New Process 435GA Transmission

Common Issues This Seal Can Address

• Transmission fluid seepage at the input shaft area
• Contaminant intrusion into the transmission case
• Moisture entry around the seal surface
• Wear-related sealing loss in older manual transmission service
• Service replacement during clutch or transmission maintenance

Installation Notes and Tips

Verify the transmission model and case dimensions before installation. Inspect the shaft surface and housing bore for wear, scoring, or corrosion, and clean the sealing area thoroughly before pressing the seal into place. Confirm the seal orientation matches the application and check for proper seating after installation. For best results, compare the old seal dimensions to the WS470380 specifications before assembly.

Quality Assurance

InMotion manufactures this seal with measured dimensions and nitrile sealing material to support consistent fit and sealing performance in service. The WS470380 part number provides a clear reference for ordering and application verification.