Pioneer Cables 762004 Automatic Transmission Speedometer Pinion Seal

Automatic Transmission Speedometer Pinion Seal

Pioneer Cables 762004 is an automatic transmission speedometer pinion seal for a wide range of GM and related applications. It is listed for vehicles such as Chevrolet Astro, Blazer, C1500, Camaro, Corvette, GMC Jimmy, Sonoma, and Yukon, with fitment spanning 1974-1997 depending on the model and transmission configuration.

Key Features

• Automatic transmission speedometer pinion seal for the speedo gear housing and driven gear sleeve area
• Short purple seal design with 2.125" outer diameter and 1.875" inner diameter
• Direct fit coverage for many Chevrolet, GMC, Buick, Cadillac, Pontiac, Isuzu, and Oldsmobile applications
• Cross-references BBB Industries 17451 and Carlson 17453 for the same application
• Part number 762004 for catalog and fitment lookup

Detailed Description

This Pioneer Cables speedometer pinion seal is used at the transmission speedometer adapter and driven gear sleeve interface to help maintain a proper seal in the housing. It is listed across many GM rear-wheel-drive and light truck platforms, including Chevrolet C1500, K1500, S10, Camaro, Corvette, and GMC Jimmy, with application-specific notes for certain 4L60-E, THM200-4R, THM250C/M31, THM350, and THM350C setups. If you are searching for a Pioneer Cables 762004 seal for a Chevrolet Astro or GMC Sonoma speedometer gear housing, this part number is tied to those exact fitment records.

Common Problems This Part Addresses

• Transmission fluid seepage around the speedometer adapter or driven gear sleeve
• Worn or hardened seal material at the speedo gear housing
• Leakage after speedometer gear service or transmission maintenance
• Improper sealing at the speedometer sensor or adapter interface
• Fitment issues when replacing a damaged OE-style pinion seal

Installation Notes and Tips

• Verify the transmission code and housing style before ordering, especially on 4L60-E and THM-series applications.
• Match the seal dimensions and application notes to the vehicle listing, not just the model year.
• Inspect the speedometer adapter, driven gear sleeve, and housing surface for wear before installation.
• Confirm the seal orientation during installation to avoid leaks at the adapter interface.

Quality Assurance

Pioneer Cables 762004 is cataloged as an OE-style replacement seal with broad application coverage and published interchange references for parts lookup and verification.