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Is a '81 sm465 the same as a 1976?

Discussion in 'The Garage' started by camiswelding, Mar 27, 2004.

  1. camiswelding

    camiswelding 1/2 ton status

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    Is a \'81 sm465 the same as a 1976?

    I just made a trade for a 1976 mod 205/sm 465 combo... the sm465 in my 1981 is in great shape.. can I ditch the 208 and swap the 205 in directly? in other words are the sm465's the same in the two different years?
    thanks
    cam
     
  2. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    Re: Is a \'81 sm465 the same as a 1976?

    not exactly sure on the 81 but the newer(83on) the 465 with 208 was a 32 spline output instead of the 10 spline. i would think they are all the same for the 208
     
  3. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    Re: Is a \'81 sm465 the same as a 1976?

    I believe your 465 will have a long 32 spline tailshaft since it was originally married to a 208. A 76 465 would have had a short 10 spline tailshaft.

    Yes, you can do it but you're going to need some more (hard to find) parts like a 32 spline 205 and a different adapter. The 10 spline version 465/205 combo is very common so you might consider swapping the whole combo and selling your take outs to recover some of the expense.
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Re: Is a \'81 sm465 the same as a 1976?

    32 spline 205 isn't that rare, but the adapter to mate it to a 465 sure is.
     
  5. camiswelding

    camiswelding 1/2 ton status

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    Re: Is a \'81 sm465 the same as a 1976?

    thanks everyone... guess Im going to get to experience rebuilding an sm465...
    cam
     
  6. backyardbuilt

    backyardbuilt 1/2 ton status

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    Re: Is a \'81 sm465 the same as a 1976?

    One more difference is the speedometer cable hook up is different (they switched sides) don't know if it changed when the splines did but that is another difference.
     
  7. Yukon Jack

    Yukon Jack 1/2 ton status

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    Re: Is a \'81 sm465 the same as a 1976?

    Don't know if this will apply to you but I have a 1968 4wd 465 and a 1989 2 wd 465 and there is a diffence that made a problem for me. The webbing on the 2 tranny's are different which caused me problems when I was bolting the 68 tranny to the 89 tranny's bellhousing. The 89 was designed so all the bolts connecting the bellhousing to the tranny were on the outside of the tranny. The 68's bellhousing used two bolts that went in from inside of the bellhousing. This meant the 68 tranny had two threaded holes, if I recall correctly, both of the top holes. As I was using the 89's bellhousing, I drilled the two threaded holes out of the 68 tranny and found that when I went to insert bolts from the outside of the tranny, into the bellhousing, I had big interference with some of the webbing on the tranny. I had to go with allen headed socket bolts and had to grind off some of the webbing and cut the allen head wrench down so I could get it on to two of the bolts. I don't know when the change occurred in the webbing, maybe it was only a 2wd difference. Just be aware.
     

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