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np 205 or 203

Discussion in 'The Garage' started by jace71, Mar 31, 2007.

  1. jace71

    jace71 Registered Member

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    Stupid question.......how do I know if i have an np 205 or 203? I've got a 75 GMC Jimmy, with a th 350 transmission....
     
  2. MattK

    MattK 1/2 ton status

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    Take a peak at the back of the case(rear-facing side), and look for a small cover bolted on near the center. Cover is a little larger than a half-dollar. This identifies a 205.
     
  3. divorced

    divorced 3/4 ton status

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    Here is a pic of the cover, it's held on with 3 bolts. This would be a 205.



    [​IMG]
     
  4. jk3078

    jk3078 1/2 ton status

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    Also on the stock shifter it should read (front to back) low-lock, low, neutral, high, high lock for the 203. A 205 would be low, neutral, 2-high, 4-high. Or somthing like that, the small three bolt cover is my prefered way of id., J.
     
  5. MacMadeMetals

    MacMadeMetals Newbie

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    Im not trying to hijck the thread but I have another question for you guys that know everything about tcases.

    I am building a K5 on rockwells with 350, turbo 350.

    Ive got my hands on a free 203 that works good. Or should I hunt down a 205. Either way I have to have a adpater to go from the tranny to the tcase. Since the turbo 350 came out of a 2wd truck.

    What are the ups and downs os the 203 vs. 205.
     
  6. MattK

    MattK 1/2 ton status

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    Generally speaking, the 203's aren't as desirable as the 205's. They are full-time 4x4 (can't stop the front shaft from spinning) unless you convert them, they are quite a bit heavier, and the 203 is chain driven as about to gear driven like the 205. The only thing worthwhile with the 203 would be the range box that can be used for a dual tcase setup.
     
  7. jk3078

    jk3078 1/2 ton status

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    I would sell the 2wd 350/203 and buy a th400 or 350 already bolted to a 205
     

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