Mcs Allison AT540/545 Mt640/643/644 Extension Housing 72-on (od: 3.632")

Extension Housing Seal for Allison AT540/AT545 & MT640/643/644 Transmissions (1972+)

This extension housing seal is a direct-fit replacement for Allison AT540, AT545, MT640, MT643, and MT644 transmissions from 1972 and up. Manufactured by Alto Products to exacting tolerances with a 3.632" outer diameter, it delivers a precise fit and dependable sealing performance for your rebuild or repair. Keep your transmission leak-free and running reliably with this quality replacement seal.

Key Features

• Precision-manufactured by Alto Products for consistent quality and fit
• 3.632" outer diameter for exact replacement of the original seal
• Durable construction resists heat, pressure, and transmission fluid
• Direct-fit design for Allison AT540, AT545, MT640, MT643, and MT644 units
• Ideal for transmission rebuilds, repairs, and preventive maintenance

Compatibility

This extension housing seal fits Allison AT540, AT545, MT640, MT643, and MT644 transmissions from 1972 and later. It is compatible with a wide range of vehicles equipped with these Allison transmissions. Please verify your transmission model and seal dimensions before ordering.

Why Choose This Part?

Alto Products is a trusted name in transmission components, and this extension housing seal is built to meet or exceed OEM specifications. If you are rebuilding or servicing an Allison AT540, AT545, MT640, MT643, or MT644 transmission, this seal provides the reliable, leak-free performance you need. Order today and get your transmission sealed right the first time.