Product Summary

Muncie 4-Speed, Powerglide, TH350, Billet Aluminum

  • 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
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Key Specs

MFG. Part #20299
BrandB&M
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B&M 20299 Details

M Racing & Performance brings you this billet aluminum speedometer port block-off plug that fits GM TH350, TH350c, Powerglide, Muncie M-20 and Aisin AY6 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:

  • 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

B&M 20299 Specifications

KEY SPECS
MFG. Part #20299
BrandB&M
GENERAL
Sold in QuantityEach
GTIN Code090127107430
Material TypeBillet Aluminum
FinishAnodized

Ratings & Reviews

5

16 Reviews

Overall Assessment

Customers highly appreciate the product for its excellent fit, easy installation, and great quality. Many report that it aligns perfectly with a 4-speed Saginaw without protruding, creating ample space for the shifter and linkages. Recognized for its practicality, it effectively stops leaks and is ideal for a speedo cable deletion. The product is not only functional but also aesthetically superior. Despite alternatives being slightly cheaper, customers recommend this product for its superior performance and value.

5

16 reviews

5

16

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I would buy again

5.0

5 months ago

Roneski

Rapid city SD.

Verified

The product worked as it should.

Would Recommend

Good product

5.0

7 months ago

Zees

Kingsport TN

Verified

Works as designed

Would Recommend

Worked perfect.

5.0

7 months ago

DJ

South East Georgia

Verified

Worked great and looks good on my Saginaw 3 speed.

Would Recommend

Once you have this you don't need anything else for the job

5.0

a year ago

robo

Colorado

Verified

this little device allows for isolation of transmission leak source when trouble shooting for leaks, good to have in your toolbox

Would Recommend

Perfect fit

5.0

a year ago

31Rod

Princeton NC

Verified

Switched to GPS speedometer. This plug fit my TH350 perfect. No leaks.

Would Recommend

Fit my TH350 perfectly

5.0

a year ago

Rejektd

Princeton NC

Verified

Trans had a horrible leak from the speedo cable port on my TH350. Going with a GPS speedometer so needed to plug the port anyways. This piece fit PERFECT. Literally a 5 min install from start to finish. Very happy with it and looks great. Well made piece.

Would Recommend

I would buy this product again and I would recommend it

5.0

2 years ago

Scooter

Lamar indiana

Verified

Great looking product and fit perfect, I will definitely recommend this product to my friends.

Would Recommend

Worked great

5.0

2 years ago

Jimbob

Sutherlin, Or

Verified

Used in my th350 transmission. Happy they made such a plus.

Would Recommend

Saginaw 441

5.0

2 years ago

Bryce

Yuma, AZ

Verified

I bought this for a 4 speed saginaw. Everything lined up great, it fit in the speedo hole snug and without any leaks. Doesn't protrude any giving tons of space for my shifter and linkages. I'm sure you could save 5 dollars on something else, but it wouldn't look as good or be as easy.

Would Recommend

Worked great

5.0

3 years ago

Fast 40

St Paul , MN

Verified

Straight forward install

Would Recommend

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