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BB transmission experts

Discussion in 'The "Juice Box"' started by racenu, Jul 15, 2018.

  1. racenu

    racenu Well-Known Member

    A few months ago I bought a bb trans that had been rebuilt. I have a shop that I use for transmission repairs so I took it to them and proceeded to explain the BB story. They never saw one but are really familiar with turbo 400's so wanted them to check it over before putting it in my car. From posts I've read the difference is in the valve body however when I watched them take it apart there where only 3 balls under the valve body. Does this sound correct? The internals looked fairly good and am happy with my purchase. Gord
     
    racenu, Jul 15, 2018
    #1
  2. Bens99gtp

    Bens99gtp Well-Known Member

    I've never had a bb transfer apart, but even though most 400s come with 6, some 7 balls, I think only 2 or 3 are 100% required to make the transition work. I would have to look at me notes page........it's is possible who ever rebuilt it removed the other balls according to.the shift kit they added.
     
    Bens99gtp, Jul 15, 2018
    #2
  3. racenu

    racenu Well-Known Member

    OK thanks, yes there are spots for 6 balls I believe 7 balls are for after 72? I'm going to be taking a second BB apart that hasn't been worked on yet from the looks of it and will pay close attention to the # of balls. Once I do that I'll report back, Gordon
     
    racenu, Jul 16, 2018
    #3
  4. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Just spoke to Mark DeConti, our NE GS/GN club go to guy for transmissions. Mark told me you can get away with as little as 2 balls, but those 2 must be there. He also told me that you should make sure the BB valve body is still there. He said these cars are almost 50 years old, and lots of things get replaced, he said, I've seen it before. The only way to verify the BB valve body is to pull it apart and measure everything.

    http://www.buickperformanceclub.com/SPTrans.htm

    THM400CheckBalls.JPG
     
    Last edited: Jul 16, 2018
    LARRY70GS, Jul 16, 2018
    #4
  5. BRUCE ROE

    BRUCE ROE Well-Known Member

    The valve plate has identification on the edge, but I have never seen a listing
    of what is what. I always keep the plate with the valve body, the case is
    mostly generic.

    As for the balls, some say you don't need half of them. I figure the General
    put them in for a reason, so I put back the whole set. Bruce Roe
     
    BRUCE ROE, Jul 16, 2018
    #5
  6. Bens99gtp

    Bens99gtp Well-Known Member

    I didn't get time to look today but I'm pretty sure the 2 that have to be there are the lowest towards the output shafts in the Oval shaped passage, and the very top one in the center.

    I hope all your original bb parts are still there. As far as my opinion the biggest plus to a bb transfer is the ability to put extra clutch plates in. There are other ways to get that now. But I'm sure for a street car there are other benifical options
     
    Bens99gtp, Jul 16, 2018
    #6
  7. Jim Weise

    Jim Weise EFI/DIS 482

    Gord,

    Someone most likely installed a older B&M shift kit it in, those old ones only used 3 check balls. Or a trans shop did that style shift kit mods to it... I recall putting those B&M kits in when I was a teenager. The separator plate in those kits was gold, and had B&M stamped on it, as I recall.

    They would make it bang, that's for sure. Later on B&M redesigned the kits to use 5 check balls, just like most of the professional kits do.

    JW
     
    Jim Weise, Jul 16, 2018
    #7
  8. racenu

    racenu Well-Known Member

    Thanks for all replies and info, I'm taking the other trans in this week so will pay close attention when it comes apart. It seems the simplest way to know if you have a real BB is the road test?
     
    racenu, Jul 23, 2018
    #8
  9. TexasT

    TexasT Texas, where are you from

    TexasT, Aug 26, 2018
    #9
  10. scubasteve455

    scubasteve455 Well-Known Member

    When I had my tranny rebuilt. I told them to stay clear of valve body . Did not want touched.
     
    scubasteve455, Aug 26, 2018
    #10
  11. scubasteve455

    scubasteve455 Well-Known Member

    It’s amazing though how many pieces were broke or wore out . And they keep going
     
    scubasteve455, Aug 26, 2018
    #11
  12. scubasteve455

    scubasteve455 Well-Known Member

    When I roll at 25-30 And punch it . All hell brakes lose! Great felling
     
    scubasteve455, Aug 26, 2018
    #12
  13. scubasteve455

    scubasteve455 Well-Known Member

    Feeling sorry only have (1)
     
    scubasteve455, Aug 26, 2018
    #13

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