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Thread: 350 vortec swap into OBS

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  1. #1
    Join Date
    Apr 2008
    Location
    Windber pa
    Posts
    7
    Ok, so it sounds like I will be able to do this. I have access to machines at work that would be able to make a bushing, or I could also weld the case(I know how to weld).

    I'm going to have to plead ignorance here, so please be patient. Where does the speedo mount now(transmission, or transfer case?

    Ok, I think I got it. The old speedo hole in the np205 will either need to be welded closed and then machined, OR a bushing made to adapt the VSS to the that case, right?(it's early, not enough coffee in me yet)


    Option 2 would to locate a 91 NP205.

    Option 3 would be delete the fuel injection and go carb.

    I am on a very tight budget.

    Since I have an old(73-87) NP205 case I could try the bushing/weld method. Does it matter what year the transfer case is?

    I may be able to locate a a newer transfer case, but it'll probably not be cheap.

    Option 3 would also cost me, but it would probably be less headaches, does this all sound about right?

    Thanks, I'm sure that I'm gonna have more questions concerning this.

    mike

  2. #2
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    why not just leave to stock speedometer setup in there and buy a digital converter box?
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  3. #3
    Join Date
    Apr 2008
    Location
    Windber pa
    Posts
    7
    Did not know that that was an option.

    What kind of $$$$ we talkin?

    What exactly does the VSS do?

    Thanks

    mike

  4. #4
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    Controls when to shift, rear wheel ABS if you have it and speedometer if you install an electronic gauge. some reference items Speedometer 8K Pulse Generator
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  5. #5
    Join Date
    Apr 2008
    Location
    Windber pa
    Posts
    7
    Ok, but with my sm465 4sp manual a VSS would not be necessary, what would the drawbacks be if any? Can it be disconnected?

    The adapters are something that I may opt to go with.

    I'm sure that the speedo in my 88 is electronic, but I'll have to check for sure. There is no ABS on my truck.

    Thanks again

    mike

  6. #6
    Join Date
    May 2004
    Posts
    2,120
    Life would be much easier with the cable like Greg is saying.


    97 GMC, 2002 LS6.

    1991 GMC Syclone #1428

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