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205 to 203 conversion

Discussion in 'The Garage' started by conoverbandit, Jan 19, 2003.

  1. conoverbandit

    conoverbandit 1/2 ton status

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    I got a 77 model 203 t-case behind a TH350. I have a fella that has a 73 model TH350 but it has the 205 behind it.My question is this, will the 73 model TH350 interchange with my 77 TH350/203? Is the rear shaft the same? Or in other words, Can I take the 205 off and put my 203 and adapter on the 73 model TH350. or am I going to have to change the transmission shaft? Thanks, Conoverbandit /forums/images/graemlins/confused.gif
     
  2. DEMON44

    DEMON44 Low-Tech Redneck

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    I don't know about the splines, but whatever you do ditch the 203 and use the 205. Use the '73 th350, rebuild it if you have to, but ditch the 203. If you're going to have the weight of an iron case better make it a 205.
     
  3. conoverbandit

    conoverbandit 1/2 ton status

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    What's wrong with the 203? I like the full time thing my self,I know it pushes more fuel,BUT, I still like it. /forums/images/graemlins/grin.gif
     
  4. Muddytazz

    Muddytazz 1 ton status

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    I think there is nothing wrong with the 203. My burb came with one and full time to boot. I plan on leaving it that way also....Just my $.02 /forums/images/graemlins/grin.gif
     
  5. 8_YOUR_H2

    8_YOUR_H2 1/2 ton status

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    Both tcases have the same input spline count. I know a lot of people who use and abuse 203's and never have problems....
     
  6. K5BLT4FUN

    K5BLT4FUN 1/2 ton status Premium Member

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    The TH350 output shaft is a 27 spline male. The NP203 has a 27 spline female input and a approx. 1" thick adapter. I will bolt directly to the back of the TH350, but you will need the original 203 adapter plate. The NP205, if it is original to the TH350 will have a 27 spline male input, and requires its origina adapter and the coupler sleeve to connect the output of the TH350 and the input of the 205. As far as which case to run, that is up to you. I personally prefer the 205 because it is all gear drive, no chains to stretch or differential to fail.
     
  7. DEMON44

    DEMON44 Low-Tech Redneck

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    Yes, I realize LOTS of people run 203's with no problems. My point was, and I should have been clearer, spinning the front all the time wears parts faster and uses more fuel. 205's just easier on the driveline, that's all. But as you say, If you can live with it, more power to ya.
     
  8. conoverbandit

    conoverbandit 1/2 ton status

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    Thank You All for your input and answers.Maybe one of these days I'll come around to the 205, but for now I'll just add another fuel tank and stick with the 203(lol). Once again Thanks to all who applied
     
  9. 4x4Freak

    4x4Freak 1/2 ton status

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    I would hang onto the 205 if you can. You may want to swap it in later on. I liked my 203, but when the chain broke I just decided to go ahead and swap in a 205.
     
  10. bablazer73

    bablazer73 1/2 ton status

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    I would try and keep that 205, if you can. If you don't want it, I'm sure you could sell it here!!
     
  11. ZonkRat

    ZonkRat 1/2 ton status

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    Why not use the best of both.Do doubler trick with 203 and 205 /forums/images/graemlins/thumb.gif
     

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