Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Convert Th350 To SM465

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by josephn, Apr 13, 2001.

  1. josephn

    josephn 1/2 ton status

    Joined:
    Nov 3, 2000
    Posts:
    138
    Likes Received:
    0
    Location:
    Utah
    What is involved in this.
    And would a sm465 hold up better than the th350 under a 454?

    1982 6.2L Diesel K5 Blazer, TH700, 31 inch tires.
    Fire ALWAYS makes it better.
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,980
    Likes Received:
    189
    Location:
    Roy WA
    Yours would be pretty easy, except again if the bell crank (z-bar) mounting point on the frame was not drilled..

    Get the tranny hump out of a donor truck, since yours should be bolted in. You'll need the adapter for a 465/208 combo, and maybe the front driveshaft, or at least have it shortened. Other idea is if you can find a complete donor truck, use a 465/205 K5 combo, and the driveshafts out of it, which should fit without mods, except you'd need adapter u-joints. Pedals etc bolt right up. 465 will hold up better than a well built 350 for longer.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A><P ID="edit"><FONT SIZE=-1>Edited by dyeager535 on 04/13/01 12:13 PM (server time).</FONT></P>
     
  3. josephn

    josephn 1/2 ton status

    Joined:
    Nov 3, 2000
    Posts:
    138
    Likes Received:
    0
    Location:
    Utah
    There are 3 donors that I am looking at right now a 465/208, 465/205, and Th400/205.

    I would realy like a manual setup.

    Doesn't the 465 have a lower 1st gear than the th400 and th350?

    1982 6.2L Diesel K5 Blazer, TH700, 31 inch tires.
    Fire ALWAYS makes it better.
     
  4. TX Mudder

    TX Mudder 1/2 ton status

    Joined:
    Jul 10, 2000
    Posts:
    2,514
    Likes Received:
    0
    Location:
    Houston
    The SM465 has a 1st ratio of 6.55:1
    I forget exactly what the 350 and 400 1st gear ratio are, but it is about 3:1 or so.
    I would HIGHLY recommend the 465/205 combo. You will never break it, period. Plus, having 4-lo on the 205 and lo on your 465 means you have a good crawl ratio from the start.
    The TH400/205 would be the better combo if you don't really like having a clutch. It's a preference thing.
    BTW, the swap itself is oretty easy, just time consuming. And, my z-bar holes were already drilled in the frame - I think they are all drilled, even the auto frames (my frame was OE with a 350/203.)
    -- Mike
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,980
    Likes Received:
    189
    Location:
    Roy WA
    The later frames were not all drilled for the mount..my '81 was not. Maybe you will get lucky and they are there, Need to compare yours to a donor truck to see. If not, no fun trying to drill I bet.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  6. josephn

    josephn 1/2 ton status

    Joined:
    Nov 3, 2000
    Posts:
    138
    Likes Received:
    0
    Location:
    Utah
    Thanks I think I will get the SM465/Np205 Combo.
    Now just have to descide where I am going to get my 454.


    1982 6.2L Diesel K5 Blazer, TH700, 31 inch tires.
    Fire ALWAYS makes it better.
     

Share This Page