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anyone ever run these axle ratios

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 1BAD88, Feb 28, 2002.

  1. 1BAD88

    1BAD88 Registered Member

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    I just rescently fried my rear end in my blazer .I looked into a rebuild and it is way to much money for me right now so I bought a used axle and put it in my truck .But now my front axle is 3.42 and the rear is 3.73 .is this combo within a reasonable difference? has anyone run these ratios without transfer case detonation?what problems can this cause? thanks for any info...................running 33's on stock lift

    1988 k-5 blazer 5.7
     
  2. 2Dogs

    2Dogs 1/2 ton status Premium Member

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    BIG difference.

    Even offroad your rear wheels will be spinning more than the front making 4WD kinda pointless.

    Probably should not use 4WD at all IMHO.

    Dave

    Rehab is for quitters.
    <a target="_blank" href=http://coloradok5.com/gallery/Daves-Pics>91 Blazer and Toys</a>
     
  3. Overkill

    Overkill 1/2 ton status

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    I say play in 2 wheel, you get almost stuck drop it in 4 and dig out, when you hit solid ground again back into 2. If ya really gotta play. Definitely stay out of 4 on any solid ground. Just my opinion.

    Pics at <a target="_blank" href=http://community.webshots.com/user/jlblmkh>http://community.webshots.com/user/jlblmkh</a>

    (Formerly heaj1)
    Swimmin like a rock, slingin like a stock, but not for long.
     
  4. RESTORE89

    RESTORE89 1/2 ton status

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    i agree. i ran the same way for a few months and did not have any problems cause i stayed in 2wd until almost stuck, then right back to 2wd.
    if you try to run in 4wd any distance at all on hard ground your gonna kill something real fast
    chris

    It needs a bigger motor.
    what's in it now?
    doen't matter it NEEDS A BIGGER MOTOR
    89 350tbi/700r4h/np208/4.11's
     
  5. Thunder

    Thunder 3/4 ton status

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    Well you could always run your 33"s in the back and 30" tires on the front [​IMG]

    But seriously. The difference between the front and rear ratios should be less than 10%

    <a target="_blank" href=http://coloradok5.com/gallery/Thunders-Blaze> Blazer pics</a>

    <font color=blue>Nevada... Where the pavement ends and the west begins
     
  6. MNorby

    MNorby 3/4 ton status Premium Member GMOTM Winner

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    I once ran 3.23 up front and 4.10 in the back. I played in 2wd till I got stuck and if that was the case it was slick enough then that who cares if you spins faster, at least they spin. Only 2 times I put in 4wd to play, once in 2 feet deep snow to see how far we could go and once on really loose dirt hills.

    '86 GMC shortbox 3/4 ton
    <a target="_blank" href=http://www.picturetrail.com/mnorby>www.picturetrail.com/mnorby</a>
     
  7. 87superblaze

    87superblaze 1/2 ton status

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    No, I think everyone is correct. That is too big of a difference.

    On another note, I know some mud racers use lower gears in the front and higher gears in teh rear. This causes the front tires to spin faster, thus improved steering in mud and the front tires will pull slightly. Pretty cool huh?

    My Truck <a target="_blank" href=http://www.community.webshots.com/user/nicksm79>http://www.community.webshots.com/user/nicksm79</a>
     
  8. rampage

    rampage 1/2 ton status

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    Actually 3.42 and 3.73 are within 10% (3.42x1.1=3.762) ... I thought the diff was suppose to be more like 1 or 2%. Ten just sounds way too high to me.
     
  9. Blue85

    Blue85 Troll Premium Member

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    Yeah, 10% is way too much. Even uneven treadwear front and rear will make it run like crap on the road.

    But how about using a 203 T-case and just never put it in "lock"? Think about that for a while...

    <font color=green>Want to see a happy guy? Look at me as soon as my new wheels and tires arrive!</font color=green>
     
  10. ChadH82

    ChadH82 1/2 ton status

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    Nope.

    Chad
    '73 Blazer,383,400,Atlas II,D60/14 Bolt,traclok/detroit,39.5 Swamps
     
  11. Thunder

    Thunder 3/4 ton status

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    Yup 3.42 and 3.73 are within 10%
    I have always been told you can get away with 10% between axles if you keep it in the dirt. Wont work on the street.
    Mudders do it all time.

    <a target="_blank" href=http://coloradok5.com/gallery/Thunders-Blaze> Blazer pics</a>

    <font color=blue>Nevada... Where the pavement ends and the west begins
     
  12. DesertDueler

    DesertDueler 1/2 ton status

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    Put 32s up front and it will put it real close to the same effective ratio.

    86Jimmy 4"&35"s,87Burb 4"&33"s,69Firebird 525 hp,and 70GTO, 65 Howard V-drive PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My toys</a>
     
  13. 1BAD88

    1BAD88 Registered Member

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    thanks for all the info I think I will run it like this for a while till I get my front ring-pinion to match .I really like the 3.73 compared to the 3.42 my truck launches off the line now and is great on the highway and improved gas mileage too......

    1988 k-5 blazer 5.7
     
  14. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

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    i got a set of 3.73 gears for the front if he is interested.
    D44. i would have to pull them but i can do that.
    e-mail or pm me if he is interested.
    Grant

    take me drunk, i am home
    www.geocities.com/seventy4blazer/parts4sale.html
     
  15. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Rear wheels will spin SLOWER with lower gears, not faster.

    I would not lock it in 4 hi unless absolutely necessary. I had 4.10s in back and 3.08s up front and locked it in once because I was really really buried.

    Axles must match within 2%.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  16. ca89blazer

    ca89blazer Registered Member

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    I had 2.73 front and 3.73 rear and in 4hi it would just bind up. I have a friend who had the 3.42 front and 3.73 rear and a 203 w/ part time kit he said his truck never climbed as well and really liked that setup.
     
  17. 2Dogs

    2Dogs 1/2 ton status Premium Member

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    True dat. My bad.

    Dave

    Rehab is for quitters.
    <a target="_blank" href=http://coloradok5.com/gallery/Daves-Pics>91 Blazer and Toys</a>
     

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