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TH350/NP203 -- SM465/Np203 -- or ??

Discussion in 'The Garage' started by deadtoyou, Jan 30, 2006.

  1. deadtoyou

    deadtoyou Registered Member

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    ALright guys I need some advice. I have a 78 K5 with a TH350/NP203.
    Now I got the damn thing stuck in the mud and now It doesn't hardley shift (It'll move but not well at all, have to give lots of gas to move)...Now I know of a 2WD SM465 sitting around that I could prolly get for cheap. So what would be the easier/cheaper way to go.... SM465/203 OR buy rebuilt 350 or get 350 rebuilt? Any input would be greatly appreciated...Thanks!!
     
  2. DEMON44

    DEMON44 Low-Tech Redneck

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    I'm not aware of a 203 ever coming behind a stick. So IMO there's be alot of jerking around to get it to jive. I'd rebuild the th350, cheap and easy. Or buy an off the shelf reman. couple hundy at most and you're rolling.
     
  3. Cricket

    Cricket 3/4 ton status

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    Did you pull the pan on the 350 or change the fluid and filter? How do you know the transmission is bad?

    If you change from a 350 to a 465 your going to need a the matching bellhousing, clutch pedals, drivelines, floor hump, et.

    If you want to do it as cheaply as possible I'd say rebuild the 350 at a local shop you can trust.
     
  4. deadtoyou

    deadtoyou Registered Member

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    The fluid is really dirty, looks like really small pieces of metal in it so I just figured it was toast? Thanks again
     
  5. Cricket

    Cricket 3/4 ton status

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    Change the fluid and filter, flush the converter. If you can't do it, have it done. Some small metal particles are normal. If there is a large amount or metallic sludge your probably looking at a rebuild.
     
  6. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    The 465/203 combo was offered, but they're rare. I used to own a 465 version 203 that I was going to use for a doubler, but I parted with it.

    I'd probably go with rebuilding the 350 as well since you already have it, and it'd be the least cumbersome to repair/swap. Since you're in Spokane, I'd suggest contact mountainexplorer. He may have something you could buy that's working.
     
  7. 55Willy

    55Willy 3/4 ton status

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    if I remeber right the 465-203 was used one year in a 74... i'd say fix the th350
     
  8. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    You're correct, my good man.
     
  9. 55Willy

    55Willy 3/4 ton status

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    aka GM GOLD... thats why the 465 is the most uncommom doubler. trust me I have 3 of those 465.. pain in the butt to get the right stuff so the 6.55 to 1 helps by it's self.lOL
     

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