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Speedo Correction: 4.10s & 33 " tires

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Scott73, Sep 16, 2002.

  1. Scott73

    Scott73 Registered Member

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    Speedo Correction: 4.10s & 33 \" tires

    I've got an '87 with 33" tires, 4.10 gears, and 700r4 tranny. I've done some rearch and the best I can tell, I need to put a gray (15 tooth) drive gear and a red (37 tooth) or blue (38 tooth) driven gear. Here's where I got my info. GM Tranny info I'm I right on my calculations? Anybody have any experience in do in this?
     
  2. txbluethunder

    txbluethunder 1/2 ton status

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    Re: Speedo Correction: 4.10s & 33 \" tires

    from my research i found out that there needs to be around a 2.6:1 ratio. for mine with 4.56's and 35's i needed 39/15. for you i would say 45/18. if you put you stock tire and gear ratio into Speedo Calculator then it should give you the stock gears. If you take those and find the ratio between them it should also be 2.6. Maybe I'm wrong but it worked good for me.
     

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