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What's the tranny in 80's 1 ton crewcab

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 88k5canuck, Apr 9, 2002.

  1. 88k5canuck

    88k5canuck Registered Member

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    What\'s the tranny in 80\'s 1 ton crewcab

    I was out looking at an early 80's Chevy 1 ton crewcab. It has a d60, 14bolt, 350, 205 and a 4 speed standard. My buddy is looking chopping the rear frame and moving the rear axle closer to the front. Does anybody know what tranny that is and the gear ratios.
    Thanks for your help
     
  2. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    Re: What\'s the tranny in 80\'s 1 ton crewcab

    Its an SM 465.
    Ratios

    1st - 6.55
    2nd - 3.58
    3rd - 1.57
    4th - 1.00
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: What\'s the tranny in 80\'s 1 ton crewcab

    3rd is 1.70:1

    Rene
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: What\'s the tranny in 80\'s 1 ton crewcab

    I didn't follow the "I counted the SM465 gear ratios thread" : ) but I noticed as I was about to update my transmission gear ratio chart with that info, that the SM420 has gear ratios that are almost identical, with a very similar looking case.

    When that 1.70/sm465 info was obtained, was the tranny positively ID'd, and/or will the gears that make up the 3rd gear set interchange between the 420 and 465?
     
  5. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    Re: What\'s the tranny in 80\'s 1 ton crewcab

    I knew I'd get that one wrong. I was going to put 1.70 but used the other #.

    Oh well. Thanks Rene. /forums/images/icons/smile.gif

    John
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: What\'s the tranny in 80\'s 1 ton crewcab

    I saw the tranny on MJ's bench. It was a 465.

    Without having one to check my only guess is that the SM420 has the 1.58:1 3rd and 'assumptions' are made when tech articles are written.

    I've also seen slightly diferent ratio's listed for the NV4500. Some sites list 5th as .70:1, others say some years are .73:1 and other years are .75:1. I'll count the teeth on mine.../forums/images/icons/smile.gif

    Rene
     
  7. m j

    m j 1/2 ton status

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    Re: What\'s the tranny in 80\'s 1 ton crewcab

    I wish it was a 420, i would sell it to a jeep nut for $$$

    pretty hard to miss the huge wart on the side of a 420 case
     

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