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3 speed trans ID

Discussion in 'The Hokey Ass Message Board' started by 500 single, Mar 1, 2010.

  1. 500 single
    Joined: Jul 8, 2006
    Posts: 119

    500 single
    Member

    Hello Group. I'm trying to nail down just what I've got here. I was given a 3 speed manual transmission that came out of a '69 or so chevy longhorn pickup, either a 3/4 or 1 ton and equipped with a smallblock; probably a 307. The transmission has an iron case, a 10-spline input shaft, and the case casting number is 3987948. The side cover has 7 bolts,and the casting number on it is 3952646. There is aso a small metal tag on one of the side cover bolts with the number 3968081QY. The tailshaft has no bolt bosses on it for a floor shifter, so I'm guessing that it was a column shifter. From what I've been able to find out by searching this forum, it is likely a saginaw, but I just wasn't sure. I'm planning to install this in my '31 A coupe behind a 327. Any help appreciated. Sorry for lack of pics. I do not have the transmission here at this time. Thanks.
    Greg.
     
  2. squirrel
    Joined: Sep 23, 2004
    Posts: 44,635

    squirrel
    Member

    Then you can't compare it to the pictures, can you?

    http://images.google.com/images?hl=en&source=hp&q=saginaw+3+speed&btnG=Search+Images&gbv=1

    Sounds like it could be a saginaw. What bellhousing do you plan to use? the truck trasnmissions before 1973 had the two bottom mounting holes tapped, cars did not. Also the bearing retainer is a larger diameter than cars on many 67 and newer truck transmissions. These things may or may not be a problem for you.
     
  3. 500 single
    Joined: Jul 8, 2006
    Posts: 119

    500 single
    Member

    Thanks for the reply Jim. The pics may help. As to the bellhousing, I have a cast iron bell with tapped holes in the side mounts, and provision for the bellhousing mount type starter. The bearing retainer was bigger than the hole in the bellhousing, but I turned it down in a lathe to fit.
    Greg.
     
  4. Herdez
    Joined: Feb 21, 2007
    Posts: 357

    Herdez
    Member

    There is also the muncie 3 speed with same gear ratios as the th350 and the heavy duty one with lower gears. In 68-69 they were used behind big blocks and heavy duty trucks. I have one in my car. I'll need to see a photo of it.

    These are photos from a tranny builder on roundy rounds on the net. The one on bottom is a HD version muncie with the low gear option and top is sagina.
    [​IMG]
     
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  5. 500 single
    Joined: Jul 8, 2006
    Posts: 119

    500 single
    Member

    I'll have to compare my side cover with the pictures, but the saginaw looks familiar. Even if it is a Sag, if it came in a full size truck it ought to be allright in an A.
    Greg.
     
  6. 500 single
    Joined: Jul 8, 2006
    Posts: 119

    500 single
    Member

    Thanks again guys. After getting another look at my transmission, I see that the bolt pattern on the side cover and the shape of the tailshaft housing are identical to the muncie in the above picture. I read conflicting information on which of the two transmissions is stronger/better, but since it fell in my lap, I'll go ahead and use it.
    Greg.
     

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