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another ring and pinon ?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by xnoahx, Jun 9, 2001.

  1. xnoahx

    xnoahx 1/2 ton status

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    sorry about all of these, but do you have to have relatively the same gear ratio in both front and rear axels?

    Check out my 73 K5 http://members.theglobe.com/xnoahx/73k5.htm
     
  2. xtreme_wlr

    xtreme_wlr 1/2 ton status

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    Yes, you want them to be the same or as close as possible. this is to prevent the drivetrain from "binding up" when you have the truck in 4 wheel drive. Having very different ratios make the tires on the different axles turn at different speeds and can be hard on the rest of the drivetrain.

    78 Chevy 1 ton Stepside RockCrawler
    468 BB, SM465, NP205
    D60 front, GM 14Bolt w/ Detroit
    <A target="_blank" HREF=http://www.bowtiecrawler.com>http://www.bowtiecrawler.com</A>
     
  3. BigTex

    BigTex 1/2 ton status

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    Absolutely. Although some rigs have a 4:10 and 4:11. They can't be very far off. By the way, the current issue of Four Wheeler has some excellent write-ups on gear set ups and it is pretty complete. Check it out!
     
  4. '73 K5

    '73 K5 1/2 ton status

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    I have 4.09 in the front and 4.11 in the rear. It doesn't make any difference. Even if you had the same ratio front and rear, one end would spin faster that the other, no matter what. Due to difference in tires, air pressure, etc. Thats why you shouldn't drive on pavement with 4 wheel drive engaged.

    '73 K5
    Chevy good...Ford bad
     
  5. xtreme_wlr

    xtreme_wlr 1/2 ton status

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    Well you ratios are close enuf that it doesnt make a difference. You wouldnt want to run say 3.73 and 4.10. That is where you start to have problems. 4.09 and 4.11 are a close enuf case. The only time you might want to consider different ratios is when you are running totaly different tire sizes, say 35" in front and 44" in the rear. Then you could compensate for that difference by using different gear ratios front and rear.

    78 Chevy 1 ton Stepside RockCrawler
    468 BB, SM465, NP205
    D60 front, GM 14Bolt w/ Detroit
    <A target="_blank" HREF=http://www.bowtiecrawler.com>http://www.bowtiecrawler.com</A>
     
  6. '73 K5

    '73 K5 1/2 ton status

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    Yea thats what I meant. 4.09 and 4.11 are still in the same catagory. 3.73 and 4.11's aren't even in the same area code. I just have read about too many folks freakin' out about .01 or .02 difference when they shouldn't.
    I've also heard of mud runners with same size tires running a lower gear in back. They say it keeps the front tires from digging in so bad because they are spinning slower. And if you only engage four wheel drive in the sloppy mud, you'd have enough slippage to get away with it.

    '73 K5
    Chevy good...Ford bad
     

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