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sm465 questions

Discussion in 'The Garage' started by 84gmcjimmy, Dec 19, 2004.

  1. 84gmcjimmy

    84gmcjimmy 1 ton status

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    What is the spline count for sm465 trannies that have a np208 bolted up behind them?
    I searched and didn't find too much...
     
  2. 84gmcjimmy

    84gmcjimmy 1 ton status

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    nevermind found it... 10 spline, right? What kind of machining would it take to convert it to 32 spline? How can I make a np203 from a th-400 bolt up?
     
  3. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    sm465 with a 208 is 32 spline
    sm465 with a 205 is 10 spline up to 84-85 then that is also 32 spline
     
  4. 84gmcjimmy

    84gmcjimmy 1 ton status

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    Yeah I just read that on ORD's site. What would it take to put a th-400 version np203 behind it? Possible?
     
  5. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    pulled from the ord site

    :thumb:
     
  6. 84gmcjimmy

    84gmcjimmy 1 ton status

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    Ah, thanks TJ. So the th-400 version np203 will have 32 splines right? Then I just need to drill and tap the bolt pattern onto the sm465 case, then it's ready? Will this be very strong? I looked from where you pulled that, and it says:
    Except that method needs machining, and I don't have a shop near by that machines stuff like that.
    Method 2 I guess i'll use!
     
  7. u2slow

    u2slow 1/2 ton status

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    You redrill the front face of the NP203 so it has the same pattern as the 208. The 208 adapter you have is your template ;) Strength should be no different than stock.

    The other way (using the SM465/203 adapter) is essentially the same for strength, but the adapter is not common. The main benefit is it ends up shorter overall, but comes at a price.
     
  8. 84gmcjimmy

    84gmcjimmy 1 ton status

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    Ooh okay I understand now. Thanks.
     
  9. mountainexplorer

    mountainexplorer 1/2 ton status

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    I got a 32 spline 1981 SM465 tranny with a 208 adapter. :D
     
  10. 84gmcjimmy

    84gmcjimmy 1 ton status

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    LOL it's okay, I already have one, it's in the Jimmy right now.
     
  11. mountainexplorer

    mountainexplorer 1/2 ton status

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    Never miss an opportunity to try and make a sale. Ha. :D
     
  12. 84gmcjimmy

    84gmcjimmy 1 ton status

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    I'd imagine you have a couple of those anyways... I know where to go if I end up needing one though! :)
     

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