Regearing and why you need to do it

Discussion in 'PA- Keystone Cruisers' started by jamarquardt22, Feb 19, 2018.

  1. Jakes40

    Jakes40 IH8MUD Poser

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    My new 40 axles have 4.88s I like the 4.10's. I don't drive the 40 on the road much so the 4.88 will work well.
     
  2. brian

    brian SILVER Star

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    370s and 33s are not bad.
    370s and 35s wouldnt be terrible with an h41 or h55, but with an h42 its going to be hateful.
     
  3. Pacer

    Pacer SILVER Star

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    Humm....
    Thinking the 33"s from my 62 and 4:1 transfer case gear set to start...
    Then a 1.9tdi or a Tesla motor :hillbilly:
     
  4. shmukster

    shmukster

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    Was gonna start looking for an e-locker third member from an 80 series truck. Thinking if I find one at a reasonable price I'll get a set of 4.88 gears for it and slip it into the rear axle. Then it dawned on me I'd have to get a different locker-side rear axle because the e-locker thirds require a longer splined area than a standard axle.
    Now I'm thinking about just buying a new selectable locker and replacing the Detroit with it. Would be a relatively easy change. Having had the 40 out today and going 62 MPH with it on the way home I've decided the gears are just fine the way it is and I just want to lose the Detroit in the rear.
     
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  5. jamarquardt22

    jamarquardt22

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    @shmukster what rear axle do you have in that anyhow?
     
  6. shmukster

    shmukster

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    Has FJ60/62 axles, 4.88 gears.
     
  7. Pacer

    Pacer SILVER Star

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    Has fj60 axles.
    62 axles are trussed and have a small cut'n turn from the factory.
     
  8. jamarquardt22

    jamarquardt22

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    Recently I was asking somone what gear ratio they had. They were looking at swapping in a different 3rd member. The pricier was they didn't know what they had. When you can count the teeth of the gears it's easy to figure out.

    For example: 41 teeth on the ring gear divided by 10 on the pinion gear is 4.10:1 ratio.

    It's' harder when you can't see the gears like when they are installed in a axle.

    Spools,arb and electric lockers are easy. Engage the locker. Jack up the axle and make some marks on the drive shaft and tire. Spin the tire 10 revolutions and count the number of times the driveshaft goes around. Divide the drive shaft revolutions by 10 and round off to nearest possible ratio.

    Open rears are a little harder. Jack up one tire spin it 20 times, count the driveshaft revolutions and divide by 10.

    I think I'm remembering correctly. If this dosent work or I'm wrong please tell me. It' been a long time since I did this.
     
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  9. jonheld

    jonheld

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    For a daily driver, a 3FE equipped 80 with 4.88 gears and 33s is pretty good. I ran this way for years on my 91. 33s on the street and 36 Swampers on the trail.
    If you want to run 35s on the street, I would go with 5.29 as that will keep you in the torque band and help offset the additional weight.
    I run 35s and 4.88 on my LX450 and it can almost get out of its own way, but it has more available ponies.
     
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  10. Pacer

    Pacer SILVER Star

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    Mmm, 36" Swampers.

    hqdefault-1.jpg
     
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  11. jamarquardt22

    jamarquardt22

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    So for anyone interested in learning how to set up gears or trying to find someone that knows yotas check out zuk at www.gearinstalls.com
     
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