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TH350 conversion to SM465

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by captaininsano, Oct 14, 2004.

  1. captaininsano

    captaininsano 1/2 ton status

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    I just picked up a SM465 + NP205 to put in my 78 K5 with a 350. I was wondering if there is a certain size flywheel I need, not sure which one I need since I see there is more than one size. Also any info that is "good to know" for this conversion would be cool too! I was going to go the doubler route with my TH350 and NP203 but cost and the fact that my TH350 is a pos made me decide this route is better.

    Thanks!

    Mark
     
  2. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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  3. captaininsano

    captaininsano 1/2 ton status

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    Thanks yeah I have read that several times, very cool. Still need the flywheel size though and tooth count needed for a '78 350.
     
  4. NoSmog73

    NoSmog73 1/2 ton status

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    Should be a 168 tooth count flywheel..IIRC you can reuse your old starter to.,as long as the flywheel is a standard pitch and not a metric pitch.. /forums/images/graemlins/waytogo.gif
     
  5. Poohbair

    Poohbair 1/2 ton status

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    I think that you have to make sure if you have a 1 piece or 2 piece rear main. I think that the flywheel's are different.
     
  6. 84_Chevy_K10

    84_Chevy_K10 Banned

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    They ARE different. The engine in my truck is an '86 so it has the 1 piece seal. I had to buy a new flywheel to the tune of about $100.
     
  7. captaininsano

    captaininsano 1/2 ton status

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    Thanks for the info, how about clutch? When did the Chevy truck and K5 go from mech to hydro clutch?
     
  8. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    I think it was in 85 from what I was told . I know from seeing an 86 close up that they were for sure hydro by then , and I know in 83 ( I have one ) they were still mechanical /forums/images/graemlins/k5.gif /forums/images/graemlins/k5.gif
     
  9. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    85 was the first year of the hydrolic clutch.
     

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