🌍 We Ship Worldwide Learn more

💵 Afterpay available, shop now, pay later Learn more

💬 Customer Support Click here

B&M  |  SKU: 20301

B&M TRANSMISSION SPEEDOMETER PORT PLUG - 20301

Fits GM and B.O.P. TH400 Transmissions

Regular price $108.50 NZD + GST
Shipping calculated at checkout.
⚠ Special Order Item — ships direct from supplier. No returns, exchanges, or cancellations once processed. Please allow 7–20 days shipping.

Description

Fits GM and B.O.P. TH400 Transmissions

Part Number: 20301

B&M Racing & Performance brings you this billet aluminum speedometer port block-off plug that fits GM and B.O.P. TH400 transmissions. This plug is used to block the mechanical speedometer gear port when upgrading to an electronic speedometer and includes a replaceable Buna-N-rubber o-ring. It features a black Mil-Spec anodized finish for long-lasting good looks, even in harsh conditions. Comes with hardware and instructions for a quick and easy installation.

Features and Benefits

• Billet Aluminum Construction with Engraved B&M Logo
• Protects Your Transmission from Contaminants during use or storage
• Replaceable O-ring seal for leak prevention and simple maintenance
• Perfect for Electronic Speedometer Conversions
• Mil-Spec Black Anodized Finish for long lasting good looks
• Includes Stainless Steel Hardware for Superior Corrosion Resistance

Specifications

  • Specifications
    BrandB&M
    CategoryTransmission
    Emission Code5
    Item GradeHigh Performance
    MaterialAluminum
    part typeTransmission Speedometer Housing
    Product TypeSpeedometer Port Plug
    Sub CategoryTransmission Components
    TransmissionGM TH400
    TransmissionB.O.P TH400

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Union Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.