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how much longer is a 203 vs. a 205?

Discussion in 'The Garage' started by Cornfield creations, Feb 27, 2007.

  1. Cornfield creations

    Cornfield creations 1/2 ton status

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    I was thinking about swapping a np 205 in place of my np203. My blazer is a 79 and the transfer is coming out of a 72. How much shorter is the 205? Also, I already have a HAD shaft, would my 203 drive flange work on a 205? I don't know if the rear output shafts are the same or not.
    Thanks in advance guys!
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    I have both I can photograph when I get home . But I figure at least almost the width of the 205 itself . The 203 has a rangebox and a tailhousing . The 205 is almost as thick as just the 203 middle , with yokes on each side
     
  3. diesel4me

    diesel4me 1 ton status Premium Member

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    my swap...

    I put an NP205 in place of a NP203 in my '74 K20..only the front driveshaft didn't fit,it was too long,had to find one from a '69 GM 4x4,the only year they had a "shorter" front shaft factory,and it fit perfect....the rear shaft bolted right up fine..so I think the only difference is the front half of the NP203 is farther away from the front axle than a NP205 would be..

    Of course,trucks DO change slightly from year to year--mine was an abortion of several trucks combined into one..had a '77 frame,and '85 axles,bed,and doors,etc..depending on what tranny,adapter,crossmember etc,you may find it won't work out as easy as my swap did..only one real way to find out--start wrenching!..:crazy:
     
  4. 1979jimmy350

    1979jimmy350 1/2 ton status

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    well another option you have is to combine the two, a doubler is about the same length as the 203 and then you get all gear and can use the current shafts
     
  5. dbozman

    dbozman 1/2 ton status

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    Just swapped the 203 in my '74 for a 205 (behind a T350). I have CV shafts on both ends. The rear had to be lengthened roughly 3(ish) inches if memory serves and front shortened about the same 3 inches. I was able to use the rear output yoke from the 203 on the 205 to make with my CV joint, just had to get a different seal from Carquest.
     

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