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Turbo 350 Transformation

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CooknwithGas, May 29, 2002.

  1. CooknwithGas

    CooknwithGas 1/2 ton status

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    Can anyone tell me if a standard turbo 350 Transmission can be modified to fit my 1975 blazer with an NP203? I'm assuming all TH350's are alike and I can just change the back-end with parts from my old transmission. Is this true?

    Thanks for any help.

    Scott.
     
  2. NITRO

    NITRO 1/2 ton status

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    my th350 is connected to a NP203.....should be a way


    NITRO
     
  3. lukerz

    lukerz 1/2 ton status

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    I did mine. I have not run it yet. You will need to get a rear shaft from a 4x4 transmision and swap it out.
    Luke
     
  4. CooknwithGas

    CooknwithGas 1/2 ton status

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    I didn't word my question properly. I already have a TH350 in the truck. I want to take a NON-4x4 Turbo 350 that is in better shape and install it in my truck in place of the original TH350. Question is - Can any Turbo 350 be converted to a 4X4 version with some parts from my old TH350?

    Thanks for your help.
     
  5. NITRO

    NITRO 1/2 ton status

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    yup

    NITRO
     
  6. keith

    keith 1/2 ton status

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    Yes BUT If you have a 2wd version it will have a long shaft. You will need to install the short shaft. PROBLEM= must disassemble the tranny to do it. Might as well rebuild the old one. Should be done for around $400. if you take it to a tranny shop.
     
  7. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Cut the tailshaft with a sawzall and clean it up with a file. Hillbilly, but cheaper than having someone rip apart a 2wd tranny, getting "stuck" with a 2wd tranny case and 4wd tailshaft.

    If you're gonna spend money on a TH 350, make it a 4x4 model, with the thicker, "K" case. Otherwise, just cut the shaft down.
     
  8. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

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    th 350 has 4 output shafts. and only one for a 4x4. all th350 will bolt to all t-cases off a th350. in 75 a th350 and 203 was the most common blazer out there. are you converting from manual?
    grant
     
  9. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

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    th 350 has 4 output shafts. and only one for a 4x4. all th350 will bolt to all t-cases off a th350. in 75 a th350 and 203 was the most common blazer out there. are you converting from manual? and if you have a 2x4 trans all you need is the output from a 4x4
    grant
     

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