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4.10's with 39.5"

Discussion in 'The Garage' started by BigOrange90Jimmy, Aug 28, 2002.

  1. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    4.10\'s with 39.5\"

    What do you think about running 4.10's with 39.5" TSL. Tranny and t-case is 465/205. I found a 44/14b combo free and need to know what you would run gear-wise. I like to ride the highways and interstates, so keep that in mind.
     
  2. little79k5

    little79k5 1/2 ton status

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    Re: 4.10\'s with 39.5\"

    i'm not sure, but i'm about to try 4.10's with 38.5's because i do mostly street driving and hwy. everyone else says i should go with 4.56 but i have a TH350 and i think that 4.56 would be turning some high rpms on the hwy.
    i let ya know how it works
     
  3. 6.2Blazer

    6.2Blazer 1/2 ton status

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    Re: 4.10\'s with 39.5\"

    Since you have the granny low first of the 465 to take off, it probably wouldn't be that bad for highway cruising. A friend of mine use to run 4.10's with 42's behind a TH400 auto and a moderate big block, it got along just fine.
     
  4. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    Re: 4.10\'s with 39.5\"

    Alright next question. Would you trade my 6-lug pieces of crap for a set of 3/4 axles. D44 front w/flat-top knuckles, and International Harvester hubs. 14b rear with a Gov-Loc. Both loaded with 4.10's. The hubs to me are questionable. They look worn out and one doesn't fully disengage. I've seen the axles, but I don't know the internal condition of them. What would you do? He currently has 38's on them.
     
  5. mountainexplorer

    mountainexplorer 1/2 ton status

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    Re: 4.10\'s with 39.5\"

    I have an '81 Crew Cab with 40" tires and 4.10 gears, and a 4spd/205. It has a built 396, but going down the highway on certain hills, I notice it doesnt quite have the best pulling power to maintain speed. It is a heavy truck though.
     
  6. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    Re: 4.10\'s with 39.5\"

    think it'd be enough with a, for the time being, stock 350?
     
  7. kennyw

    kennyw N9PHW Premium Member

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    Re: 4.10\'s with 39.5\"

    IH hubs? as long as it is not a closed knuckle axle with drum brakes the axles are worth trading. You can always buy new hubs...
     
  8. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    Re: 4.10\'s with 39.5\"

    No it's not closed knuckle and it has disc brakes. It's a 1st gen. axle.
     
  9. MudbogAD

    MudbogAD 1/2 ton status

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    Re: 4.10\'s with 39.5\"

    1/2 ton axles aren't crap.
     
  10. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    Re: 4.10\'s with 39.5\"

    They aren't? Well why is everyone screaming "1-TON"?
     
  11. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Re: 4.10\'s with 39.5\"

    To get an idea how the gears will work, take a look at this.

    As for half ton being crap, no, they are not crap for some usages. However, anything over 35 and/or high torque generally is getting into 1-ton territory, depending on the usage. You can still run the 1/2 ton stuff, but you better know your rig, be gentle when the wheels are turned/bound, etc. 3/4 ton fronts are little better than 1/2 ton in this respect. Axle shafts, joints, and r/p sets are the same, only the brakes get an upgrade. However, the rear will usually net you a C14FF which is WAY stronger than 1/2 ton axles at the cost of weight and some clearance (not much lost if shaved).
     
  12. mountainexplorer

    mountainexplorer 1/2 ton status

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    Re: 4.10\'s with 39.5\"

    I'd guess that youd still get around, just with pretty slow acceleration. The 39.5 Boggers that were on the Crew cab were pretty hard on the clutch and other parts. In 2 years, it went through 2 clutches. (of course, thats being driven hard)
     
  13. ftn96

    ftn96 1/2 ton status

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    Re: 4.10\'s with 39.5\"

    Not sure, but if my recolection of the topographical map servers me correctly...Northern Cali is hilly/mountainous.

    So you may be teetering on the edge of pushing it with the 4.10's and 39.5's. Now, if you have a big block, I wouldn't sweat it too much for now. I have never experienced a 465 granny gear but from what tRustyK5 was telling me (based on his 3.73/465/36" combo) the granny never got used. It was way too low.

    But from my setup, I'm running 4.56's and I run in drive up till 65. And with 36"s I'm running about 2700 ish. Hopefully this will give you some insight as to which direction to go..... /forums/images/icons/wink.gif
     

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