Speedometer Block Off Plug Delete Speedo Port For TH350 350 Auto Transmission

Speedometer Block Off Plug for TH350 Auto Transmission

This speedometer block off plug seals the speedometer gear housing port on TH350 automatic transmissions to prevent fluid leaks when deleting the mechanical speedo cable.

Overview

This speedometer block off plug is engineered to seal unused mechanical speedo ports in custom vehicle builds. Ideal for builds using GPS-driven or electronic speedometers, this speedometer block off plug prevents transmission fluid from leaking. Drag racers and custom builders choose this speedometer block off plug to keep their undercarriage clean and dry.

Built For Performance

• Billet aluminum construction resists corrosion and mechanical wear.
• High-temperature O-ring seals prevent fluid leaks under pressure.
• Direct-fit sizing ensures a snug fit inside the original transmission port.
• Single-bolt retention slot matches the standard GM clamp location.

Fits These Machines

• for TH350 Automatic Transmission
• for Turbo 350 Transmission

On-The-Job Use

• Sealing transmission casings during electronic speed sensor conversions.
• Preventing fluid loss on custom classic car builds.
• Blocking debris from entering the transmission housing when speedo cable is removed.

Specs At A Glance

Good To Know

Q: Does this delete plug require any modifications to the casing? A: No, it slides directly into the original housing and secures using your existing retainer clamp.

Q: Will this work on other GM transmissions like the TH400? A: This plug is specifically sized for the TH350 speedo port and may not fit the larger openings of other models.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.