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78 parts on an 84 ???

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ellero, Jul 31, 2006.

  1. ellero

    ellero Registered Member

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    I just bought a transmission and transfer case from a 1978 K5 to put into my 1984. When I look at the transfer cases the one from the 78 is much larger. I have not yet removed the transmsission. Should these interchange? I also notice that the 78 T-case is NOT a slip yolk. Any clue what kind ot T-case it is? Thanks

    John
     
  2. blazinzuk

    blazinzuk Buzzbox voodoo Premium Member GMOTM Winner

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    There will be a length difference you should have a 700 r4 and a 208 or a sm 465 and a 208. The trans from the 78, if the trans is a turbo 350 will be a 203 (very big heavy etc full time case) if it is a turbo 400 it could be either a 203 or a 205 ( the 205 combo is very desirable) if it is a sm 465 it will be either a 205 or 203 (the 203 case to the 465 is somewhat rare. There are tags on the back of the 208,205 and 203 to identify them. If it is a auto you will have to look at the tranny pan to see what it is. Chevys are really nice in the fact that alot of stuff can interchange so I would say yes the 78 stuff will bolt up and probably work but you may need to change other minor things
     
  3. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    The 78 if it's an auto will be a TH350/203 and since you live in California you cannot put that combo into your rig if you need to pass Cali emissions. The reason is because California considers the tranny as part of the emissions crap since there is an service engine soon light that would come on because of a lack of TCC. If you have a new chip burned that eliminated the TCC then you might get away with it. You will have to do driveshaft mods and also find the 203 shifter as well.
     
  4. hack500

    hack500 1/2 ton status

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    does the '84 even have a computer?
     
  5. maynardogle

    maynardogle 1/2 ton status

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    Yep...84s have a computer...except the 48 state diesel.
     

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