Davids 4 Speeds | Muncie 4 Speeds specialist



Name: David West

Location: Milwaukee, Wisconsin

United States

Owner and proprietor of Davids4Speeds LLC. Known on eBay as Detail4spd, selling rebuilt transmissions and auto parts collected over a lifetime of playing with muscle cars.

Looking for a specific problem or tip? Be sure to click on each month’s archives to take a cruise through my previous posts. I’ve covered a lot of ground in the blog! Also in David’s Tips, you can find a lot of useful information.

David at a swap meet

You may know David West from one of the Midwestern swap meets. He’s been a regular at Jefferson and Iola for 20 years.

Or, you may have shopped in David’s store on Ebay. He’s known as Detail4spd there and has reached “Red Star Power Seller” status with over 4000 references from buyers and sellers.

David has been a fan of muscle cars since he was a youngster. He and his friends hung out at the Great Lakes Dragway in Union Grove Wisconsin. Most of his vehicles were unsuitable for street use, used only for racing.

David was a heavy equipment mechanic and worked at A.O. Smith (later Tower Automotive) for 30 years. He can’t pass up a garage or estate sale, always hoping to find a stash of  4 speed transmissions ready to be re-built.

David keeps up with the industry traipsing the convention floor at SEMA, meeting suppliers and swapping tips with collectors and re-builders from around the world. He was quoted in Business Week Magazine April 2008.

Comments (3)

  • Avatar

    Dennis Beyette


    Hi Dave, I have a 4/speed Saginaw # GM/3831707 #392566 #GG039493 Tailshaft#3857584 Which I traded years ago for a 350 trans. at the time I was tiol that 2nd or 3rd gear was bad never needed it now I am trading it for a interior for my 38 ply I do not want to give this to the fella in bad working order can you help me out by fixing this trans. and approx. cost of doing this I am aware you need look at it so as to estimate it. Thank you [email protected]


  • Avatar

    David Lotts


    I have a 4 speed muncie transmission gm-3831707
    #3925660 tail piece 3857584GM other # on the case are P86502 and 8N402650. can you tell me if I have a
    M20, M21, or M22. I need to get some parts for it.
    please let me know. Thank You David


  • Avatar

    David West


    Thanks for calling me right after you sent this.

    I’m always happy to help a customer identify their tranny so we can get you the correct setup for your application.

    In your case, I had a few questions and we were quickly able to figure out a couple options for you to consider.


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