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My newbie question of the month (gear related)

Discussion in 'The Garage' started by BigOrange90Jimmy, Feb 26, 2003.

  1. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    I have a stock K5 with some worn out 3.08 gears. The truck has a TBI 350, TH700, and a NP208 in it. I'm thinking of going 8 lug for towing purposes. I happen to have a 4.10 14b laying in the yard, but I'm thinking it will be too high of a gear when I'm not towing, even though I have overdrive. Would you suggest 3.73? I have the parts to convert the front to 8 lug, so it's only a matter of opinion on what gear to run.
     
  2. Swanson52

    Swanson52 1/2 ton status

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    What size o' tire?
     
  3. ZonkRat

    ZonkRat 1/2 ton status

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    What size tires R U running?If 33s or larger the 4.10s should be fine.RPMs might be a little high if you like to cruise over 75,but,fine under that.One more thing,3.08s are high gear-4.10s are lower. /forums/images/graemlins/grin.gif /forums/images/graemlins/thumb.gif
     
  4. Shaggy

    Shaggy 3/4 ton status

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    <font color="green"> I'd go 4.10. So long as you're not trying to drive 80 on the freeway then it should be fine with the overdrive and 33s. I assume that you're running 33s since it's stock...
    </font>
     
  5. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    Well for the moment it has an almost worn out set of 31's on it. I was considering stepping up to a 33 if I do the swap and just get some new 16" tires/wheels while I'm at it, instead of running an 8 lug 15" wheel. If I step up to a 33, that should put my gas mileage about back to normal right?

    [ QUOTE ]
    One more thing,3.08s are high gear-4.10s are lower.

    [/ QUOTE ]

    I meant higher numerically. At least we're both right! /forums/images/graemlins/thumb.gif
     
  6. Hossbaby50

    Hossbaby50 3/4 ton status

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    4.10, I would do it, especially with OD. I run 4.56's and 32's, and it isn't bad with OD. I spin more RPM's then i would like, but I run more gear then I should with 32's. When I get my 37's it will be fine. I say do it. You won't regret it. I ran 3.73's and 32's and it wasn't enough gear for towing on any type of grade. Thats with a decent 350.
     
  7. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    that's cool. i'm leaning to 4.10's now. 3/4 ton stock K5...here we come.
     
  8. Hossbaby50

    Hossbaby50 3/4 ton status

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    I really like my 4.56's, but like I said with 32-33" tires you spin to many RPM's. Thats why I say for your app. 4.10 is probably the best, especially since you already have a rear available, and 4.10 fronts are alot easier to find then 4.56 fronts.
     
  9. ZonkRat

    ZonkRat 1/2 ton status

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    Should have put a smiley in there.The #s are what counts,not how we say it. /forums/images/graemlins/grin.gif /forums/images/graemlins/thumb.gif
     
  10. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    I'm running 31's with 4.10 gears and a 700R4 right now till I get my axle and tires off the donor truck...I LOVE it...I turn about 2200 at 70 in OD which is great for lugging up hills in OD, it doesn't even unlock the converter. It's up to you, but I'd leave it 4.10...
     
  11. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    Just for reference, my 2002 Chevy 2500HD has 30" tall tires with 4.10 gears. It seems to work just fine. I think you'll be quite happy with the 4.10's.

    My .02,
    John
     
  12. 6.2Blazer

    6.2Blazer 1/2 ton status

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    I would recommend the 4.10s also. 3.08's are way too high of a gear for anything and was just the manufacturers feable attempt to get better gas mileage back then. Also, higher gears don't always mean better gas mileage since the engine is lugging and requires more throttle input to get going and maintain speeds on grades.
     
  13. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    this is some good info guys and i appreciate it. ya'll are giving me some info i can work with, and reasons for it to. /forums/images/graemlins/thumb.gif
     

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