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Swaping transfer casses

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by codyoffroad, Nov 3, 2002.

  1. codyoffroad

    codyoffroad Registered Member

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    I was woundering if ang body has a full-time 4x4 and has swaped out the np 203 and put in a 208 or 205? Would the transfercase bolt right up to my current th350 or would I need a adapter/different th350. /forums/images/graemlins/truck.gif
     
  2. Tweetysuarus

    Tweetysuarus 1/2 ton status

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    I was kinda wondering the same thing as I have a TH350-NP203 and would like to do the TH350-NP205/NP203 doubler.
    Bill
     
  3. 8_YOUR_H2

    8_YOUR_H2 1/2 ton status

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    As long as you get the correct adapter with the transfer case they will bolt right together. So you would need an NP205 with a TH350 adapter or a 208 with 350 adapter. The np203 adapter will ONLY work with a 203. That is also true for the other transfer cases.
     
  4. HarryH3

    HarryH3 1 ton status Author

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    Keep in mind that most such swaps will also require that the driveshafts be modified. That can add a few hundred bucks to the cost of the swap. /forums/images/graemlins/frown.gif The 203 is a pretty stout case. A 208 would get you a lower ratio in low range, but it's also weaker than a 203. A 205 is slightly stronger, but has nearly the same low range ratio as the 203. So unless your 203 is trashed, there isn't much reason to swap it out. It might need to be treated to a new chain after 20 to 30 years of abuse, but other than that I wouldn't worry about it.
     
  5. 4x4Freak

    4x4Freak 1/2 ton status

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    Also be sure that the t-case has the right input shaft and coupler.
     

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