Needs some experienced eyes on this 400

Discussion in 'The "Juice Box"' started by Nailhead Ronnie, Feb 11, 2018.

  1. Nailhead Ronnie

    Nailhead Ronnie Well-Known Member

    Lol , brake shoe wow it kind of does. Went online and searched rv overdrive and seen similar applications. Thanks guys, I sure thought I lucked out because the seller said he would do 80$
     
  2. Nailhead Ronnie

    Nailhead Ronnie Well-Known Member

    Someone just told me it's a parking brake device for a RV. Thanks fellas
     
  3. Nailhead Ronnie

    Nailhead Ronnie Well-Known Member

    Would those have the stronger strait cut gears? Would I want/be able to put these guts in a bop case?. What's the advantages to the strait cut gears?

    Edit...
    Strait cut gear =stronger, more contact on the gears cause it take more power off surrounding transmission parts.

    Take more HP to run due to more friction.

    Louder like a rock crusher.

    Sought after by racers.

    In rv', buses, big vehicles like taco trucks & ice cream trucks.

    . Please correct me if I'm wrong.
     
    Last edited: Feb 12, 2018
  4. HotRodRivi

    HotRodRivi Tomahawks sighted overseas

    Thats the ole parking brake drum on the rear of the tranny. Almost always on a Truck or motorhome. Like a box truck. or dump truck. I would think that one would have the most heavy duty factory parts like more clutches per drum, heavy duty roller clutch and not the sprag type. The valve body would be calibrated for a high rear ratio most lickly. The case wont bolt up beign thats a chevy pattern. But the innards would be worth gutting out if you have the opportunity.
     
  5. HotRodRivi

    HotRodRivi Tomahawks sighted overseas

    Say Larry
    LARRY.
    Are those gear vender units like the Doug Nash units found on mid 80ies corvetts, The 4 speed plus three? Or is the gear vender just one gear. ? I have never seen on but from the outside it loooks like something similar to a large transfercase planet . Rotating drum or stationay ring gear in there?
     
  6. Nailhead Ronnie

    Nailhead Ronnie Well-Known Member

    I seen a r11 unit behind a th400 once
     
  7. HotRodRivi

    HotRodRivi Tomahawks sighted overseas

    Ha HA . wutz a r11
     
  8. Bens99gtp

    Bens99gtp Well-Known Member

    Gv are basically an add on 1 speed transmission that you can turn on and off at any speeds over about 25mph. So if you turned it on and off you could turn your 3 speed into a 6 speed. I think they gave about 30% overdrive ratio.

    Basically all 400 parts swap, some of the early pre 67 unit have to match the early year forward hub and mainshaft. There are few other parts you can get crossed up in when mismatching, like pistons and drums, some have a check valve some don't, the 2nd cushion and band apply piston have to match styles, and a few other little things here and there.

    It's very normal for the output shafts to turn easy on direction and not hardly at all the other.......it's just cause your trying to drive the planetarts backs and against all the sprags and bands from the wrong dirction. The squeel you heard if it's the same I'm thinking about is also normal, you won't hear it when actually running, it's just the parts inside again being driven from the wrong way and that. If you would pull all the clutches and drums out and be turning the planetary input shafts and sun gear as the way the power would flow, it would turn easier,
     
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  9. Nailhead Ronnie

    Nailhead Ronnie Well-Known Member

    Borg warner r11 overdrive unit..
    Here is the th400 I was speaking on. It a a SWP too tapatalk_1518578416360.jpeg
     
  10. Nailhead Ronnie

    Nailhead Ronnie Well-Known Member

    Thanks for that break down. I won't let that sound trip me up again!
     
  11. Nailhead Ronnie

    Nailhead Ronnie Well-Known Member

    Well I ended up getting the rv trans for the guts, paid 25$. So I don't feel that bad
     
  12. Bens99gtp

    Bens99gtp Well-Known Member

    That's a good score for the extra internal parts. Of course the case won't fit your 430, the output shaft will not work, nor will the extension housing. But case for bop trans shouldn't be a hard find, not sure if you need a long or short shaft output and extenoon housing
     
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  13. 300sbb_overkill

    300sbb_overkill Well-Known Member

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  14. Bens99gtp

    Bens99gtp Well-Known Member

    Yep for 100 you can simple get the correct case and not have all that spacer bs.

    Just a quick scroll through cl here I found 5 or 6 bop 400 for under 125
     
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  15. Bens99gtp

    Bens99gtp Well-Known Member

  16. Nailhead Ronnie

    Nailhead Ronnie Well-Known Member

    Yeah I'm going to hold out for a BOP 400. Wow why so much for the old nash unit, may be the guys saving up for a GV
     
  17. Bens99gtp

    Bens99gtp Well-Known Member

    I haven't seen many of these, no clue what the going rate is, dust stumble across this while doing a shotgun look
     
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  18. hugger

    hugger Well-Known Member

    That is VERY desirable core, it's a RV unit with the straight cut gears
     
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  19. Nailhead Ronnie

    Nailhead Ronnie Well-Known Member

    Yup it's mine now. Looks like I'll be running a th400 for sure now. Do you recommend a good manual/video to rebuild them
     
  20. hugger

    hugger Well-Known Member

    I've never built one, I've got several local builders that do it too cheap, for me to really try, the "SA" one from Barnes and Noble is pretty good I hear. I'm jealous tho, I been looking for a RV th400 for awhile now
     

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