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What posi unit seems best for a 350 CI/TH 350 Setup?

Discussion in 'Got gears?' started by MR.BUICK, Feb 19, 2005.

  1. MR.BUICK

    MR.BUICK Guest

    ...If I got one I would be looking for one that would give me great take off and an exceptional top end( I wouldn't go over 80 anyways, If that even). Im planning on getting the tranny rebuilt in the spring, getting a good 350 or finding one that needs rebuilt(to stock specs), and swap the 231 for the 350. What gear ratio should I run, and will it off-set my speedo any? Thanks
     
    MR.BUICK, Feb 19, 2005
    #1
  2. 71GS455

    71GS455 Best Package Wins!

    Cody,
    Any change in either gear ratio or tire diameter will make your speedo read differently. A good all-around gear for a street driven car would be something like a 3.42.

    Even if you were racing and pulled 100 mph traps in the 1/4 mile, you can get away with a 3.42 gear and 26" tall tire and keep the rpm's in a reasonable range.

    The taller rear tire you use, the more it takes away from the gear ratio. Running a 26" tall tire with a 3.42 rear will have you spinning more rpm's at a given speed than running 28" tall tires. Those are all things to keep in mind.
     
    71GS455, Feb 19, 2005
    #2
  3. 436'd Skylark

    436'd Skylark Sweet Fancy Moses!!!!!

    If you don't plan on driving far distances, or cruizing at highway speeds, you could get away with a 3.73-3.90. otherwise 3.42 is the way to go. A good running Buick 350 wouldn't really need a very steep gear, but it certainly wouldn't hurt. :Brow:
     
    436'd Skylark, Feb 20, 2005
    #3
  4. MR.BUICK

    MR.BUICK Guest

    Probably a 3:42 it will be. I want to use it as a daily driver car, and yet have some power and reliability as well. Thanks.
     
    MR.BUICK, Feb 20, 2005
    #4
  5. MR.BUICK

    MR.BUICK Guest

    Although if it offsets my speedo I will want to get it fixed, and the question is can the speedo be set to read the unit or will I have to get an aftermarket to get it to read right?
     
    MR.BUICK, Feb 20, 2005
    #5
  6. MR.BUICK

    MR.BUICK Guest

    ttt
     
    MR.BUICK, Feb 21, 2005
    #6
  7. tlivingd

    tlivingd BIG BLOCK, THE ANTI PRIUS

    there is a plastic gear in the transmission that you'd change out to adjust the speed of your speedo. it's where your speedo cable goes in to the trans (back toward the drive shaft half near the driveshaft/tranny connection)

    -nate
     
    tlivingd, Feb 22, 2005
    #7
  8. MR.BUICK

    MR.BUICK Guest

    Okay, thanks nate. Im kinda new to this stuff, I plan to do alot of work to my car this spring so im just getting the info before I start. :TU:
     
    MR.BUICK, Feb 22, 2005
    #8

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