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203 to 208 conversion

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by monte0172, Jun 30, 2003.

  1. monte0172

    monte0172 1/2 ton status

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    I have done a search but didnt come up with anything. I was wondering has anyone done a conversion like this? I was looking at this from merely a gear ratio stand point. Being a 203 has a 2.01:1 Low Range and the 208 has a 2.61:1 Low Range. If there is a post already here or someone has some knowledge in this area anything would be appreciated. Thanks,
     
  2. monte0172

    monte0172 1/2 ton status

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  3. K5Dan

    K5Dan 1/2 ton status

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    i think you'll need a different adapter.drive shaft lenths may be different. the 208's a slip yoke in the rear. that's all i can think of. i'm sure someone else will know more on this .and i'm sure it's been done more than once! /forums/images/graemlins/thumb.gif
     
  4. monte0172

    monte0172 1/2 ton status

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    I cant believe that no one has ever done this conversion. Im just looking for some tips and helpful hints if anyone has any. thanks,
     
  5. K5Dan

    K5Dan 1/2 ton status

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  6. K5Dan

    K5Dan 1/2 ton status

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  7. monte0172

    monte0172 1/2 ton status

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    Thanks you very much!!! It looks like all Ill have to do is put a slip yoke on the drive shaft and a 200$ adapter to the transmission and im in buisness. Looks like ill just find a 205 and make a doubler since i just had my 203 rebuilt. Thanks for all the help k5dan. I appreciate it.
     
  8. K5Dan

    K5Dan 1/2 ton status

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    anytime! /forums/images/graemlins/grin.gif /forums/images/graemlins/thumb.gif
     
  9. COCHEV

    COCHEV 1/2 ton status

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    the output shafts are different lengths on th350s that had 203s/205s vs the ones that had 208s. 208 version th350s had much longer output shafts. i did this swap by swapping the output shafts and useing the 208 adaptor.
     
  10. monte0172

    monte0172 1/2 ton status

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    Its sounds pretty feasible. I was also thinking of just having the transmission rebuilt that the 208 is bolted to and puttin it in my blazer all i know about it is that 3rd gear has died I havent even bothered to look and see what model it is yet. The truck also has a dana 44 front but the genious i got it from welded the spider gears together and broke one of the axles and yokes. so its pretty much trash. While i have my transmission and transfer case out i was looking into other cheap options of making it better but it looks like what i got will do fine for now thanks alot guys i really appreciate it.
     

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