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NP203, V8 doubler questions

Discussion in '60-Series Wagons' started by Project60, Aug 21, 2006.

  1. Project60

    Project60

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    Been searching but still need to clarify some details on the swap I want to do.

    Looking to do the following:
    SBC -> TH350 or TH400 -> NP203 -> Adapter - > Stock 19 TC


    I still have open questions on the swap:
    1. Adapter is about ~$500 from Colorado Offroad express?
    2. TH400 o TH350? Either works just fine? Anybody have a preference?
    3. Does the stock Tcase move and require new driveshafts?
     
  2. TOY350

    TOY350 #1 Super Guy SILVER Star

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    1. Yes.
    2. Hard part is finding the adapter for the auto to the NP203. I run the 400 for more durability, I have eaten up a 350 or two. Most run 350's without problems though.
    3. Yes, driveline mods required.
     
  3. Project60

    Project60

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    On the driveline mods, which way did you go, forward or backwards?

    How did you hook up the tcase shifters, cut a new hole or change the linkage?

    What is the difference between the NP203 and 205? I need a 203 correct?
     
  4. calfj60

    calfj60

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    yes you need the 203 because you are using the front half set of gears and not the rear portion with the chain...The front half is the part that you are using as the doubler.

    I am running a 700r4 to confuse the situation even more...Just need to get out put shaft swapped out with one from AA....Then you can use the 203 to TH350 tranny adaptor...start looking for that now...they are getting harder to find...

    My drive lines are very similar in lenght, because the t-case went back...so new cross member and new shifters...still playing with them but search on the site and several pics have been posted...Mace built a cool set recently...
     
  5. TOY350

    TOY350 #1 Super Guy SILVER Star

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    The trasnfer case will be located further back which makes your front and rear drivelines almost equal in length. Basically perfect angles to SOA.

    Custom linkage setup for the shifters, there is a thread about the linkage started by Calfj60 I think. (Yes that guy with the post right above me, damn quick typer he is!)

    You need the NP203. You keep the low range gear reduction portion of the transfer case and throw away the large chain driven 4WD portion. Where that large chain driven piece was you will install the adatper for the splitcase. The NP205 will not work although you can put a NP205 behind a NP203 with an adapter just like the Cruiser splitcase which is quite common.
     
  6. Project60

    Project60

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    Thanks guys for the info!
     
  7. Mace

    Mace rock scientist.. Staff Member s-Moderator

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    or use a 208/350 adapter..
     
  8. dallen341

    dallen341

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    6" or so if I recall correctly.

    Don
     
  9. Gumby

    Gumby Supamod Staff Member s-Moderator

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    TH400 came with the 203 in Blazers. It's stronger than the 350, but sucks more power to drive it.

    The low range shifters are pretty damn easy to fab. The 2-4wd shifter is a PIA.
     
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