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Gear ratio

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by sluggo45acp, Jan 9, 2001.

  1. sluggo45acp

    sluggo45acp 1/2 ton status

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    My truck is a 75 k5 with a 350, TH350, NP203 with 3.07 gears. Just put BFG 33-12.50 M/T tires on it and was wondering if I need to regear it to 3.73 or 4.11. Any help would be greatly appreciated.
    Happy Wheelin

    If everything works it aint a real truck
     
  2. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    I would go with the 4.11s. I have 35s and 4.56s. Even without O/D I would never go back.

    Jim '80 GMC
    Freedom First!
    <A target="_blank" HREF=http://www.bigjbear.coloradok5.com>http://www.bigjbear.coloradok5.com</A>
     
  3. Executioner

    Executioner 1/2 ton status

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    What do you need the K5 to do ?
    Go wheeling with the T-case in low range, if you go where the tires will allow, then you could be ok
    if not then maybe a regear would help.
    Good luck
     
  4. ftn96

    ftn96 1/2 ton status

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    what kind of wheelin do you do and how much do you drive on the highway? I have a bud with 32's and 3.73's with no overdrive and he says he loves it. But he just goes and plays in the mud and runs about 70 with no problems on the interstate. So maybe that will help you a little.

    Will work for parts, beer and sex.
    90 Jimi,350/700R4/241/10bolts/3.73's/33's/4"
    <A target="_blank" HREF=http://mccordhouse.freeservers.com>http://mccordhouse.freeservers.com</A>
     
  5. sluggo45acp

    sluggo45acp 1/2 ton status

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    Thanks for the imput. Currently the truck is my daily driver(80 miles round trip), so it will proubly be 80% highway. I have notice some loss of power since the new tires and lower gas mileage. I quess my real question is will I hurt anything if I leave the gears as is. Other than my wallet.
    Happy Wheelin

    If everything works it aint a real truck
     
  6. ftn96

    ftn96 1/2 ton status

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    You'll be fine as long as your not doing alot of hard core wheeling. At least for a while anyway, but not for years. If you know hwat I mean. But if your just part time wheeling, and no rock crawling, you'll be fine. But in the future with your condition (highway driving) I'd go with the 3.73's.
    Hope this helps.

    Will work for parts, beer and sex.
    90 Jimi,350/700R4/241/10bolts/3.73's/33's/4"
    <A target="_blank" HREF=http://mccordhouse.freeservers.com>http://mccordhouse.freeservers.com</A>
     
  7. Omar

    Omar Registered Member

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    I HAD THE SAME SET UP AS YOU HAVE NOW WITH MY 75 JIMMY IF YOU HAVENT DONE THE PART TIME CONVERSION KIT DO IT YOU GET BETTER MILAGE WITH MY 33 AND 3.07's I LOVED IT ON THE HIGH WAY I DROVE 80 MILES (ROUND TRIP) A DAY THATS WORK AND BACK AND GOT GOOD MILAGE BUT THAT WAS A LOT TO DO WITH THE PART TIME KIT AND MY MSD IGNITION NOW THAT I DONT CARE ABOUT MILAGE I PUT 4.10's AND LOVE EM BUT MILAGE WENT DOWN GREAT ON THE STREET NOT SO GREAT AT 65mph BEFORE AT 60 mph I WAS AT 2000RPMS AND NOW 2800RPMS SO YOU FIGURE IT OUT
    JIMJIM.COLORADOK5.COM
     

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