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4L60 to 203

Discussion in 'The Garage' started by rpm35, Jun 18, 2003.

  1. rpm35

    rpm35 Registered Member

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    I snapped the output shaft on my NP241 /forums/images/graemlins/angryfire.gif. So its time to put a doubler in. I have the 203 already and would like to run it untill I can afford a 205 and the adaptor. What is involved with mating the 203 to the 4L60. Any suggestions welcome.
     
  2. blasterD

    blasterD 1/2 ton status

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    As long as you have a 203 from a th350 the input shaft is almost the same. The 4l60 output shaft is about 1.5" longer than the th350 output shaft. You will need to either swap out the output shaft for a shorter one or use an adapter. You can get a conversion output shaft from offroad design http://www.offroaddesign.com/ or advance adapters http://www.advanceadapters.com/acrobat/gm.pdf in order to swap out the shaft you must disassemble the entire transmission. It can get a little spendy unless you can do it yourself but this would be the shortest way to adapt it. If you wouldn't mind an extra 1.5" on your driveline you could get an adapter from Exaxt http://www.exaxt.ca/misc.asp it is essentialy a spacer that fits between your 4l60 and the stock adapter for the 203.
     
  3. rpm35

    rpm35 Registered Member

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    Thanks for the info. I think I will go with the Exaxt adaptor. I really don't want to tear into the tranny. When the 4l60 goes out I would like to get a 4l80. So I'll deal with the extra length then. /forums/images/graemlins/k5.gif
     

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