Building a Chain Drop Box

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  1. #1

    Building a Chain Drop Box

    I use my truck for mostly trail driving and mud pits, and never shift out of low range, so I'm installing a chain drop box.

    I know the concept of building them, and most of the parts. But trying to convey that to the guy behind the counter is a challenge.

    Have any of you built one.? Or can anyone tell me what I'd need to ask for in regards to 2 standard cut gears, one larger than the other. I need them to be able to install on a shaft, with a pillowblock on either side to hold them inplace.

    These two gears then have a Double 40, or Double 80 chain driving your axles..??

    I know there's machinists out there, and I need the proper terms to ask for..


    Thanks..

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  3. #2
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    just wondering what the hell is a chain drop box anyways?

  4. #3
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    Originally posted by chevys suck
    just wondering what the hell is a chain drop box anyways?

    a dirt simple transfer case, no shifting no low range no high gear, basically a sprocket turning a chain that turns another sprocket thats turning the driveshafts.
    2010 Dodge Ram, chock full of Labrador and chainsaw

  5. #4
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    Take a stock t-case, put into 4lo, and torch off the shifter. Really though...I don't really see a benifit over a normal transfer case. Am I missing something?

    Also...what vehicle is this for?
    Caswell

    1998 TJ - 5.5" lift, Dynatracs, 40s.

  6. #5
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    Originally posted by Goof
    Take a stock t-case, put into 4lo, and torch off the shifter. Really though...I don't really see a benifit over a normal transfer case. Am I missing something?

    Also...what vehicle is this for?

    the only benefit is for mud bogging man, less moving parts= less crap that can break and their very simple to design and build beefy.
    2010 Dodge Ram, chock full of Labrador and chainsaw

  7. #6
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    Why not use gears and not a chain/sprocket?

    Line up 3 gears in a row?

    Id go a bout finding the sprockets first, then the chain, then the shaft then the bearings.

    If you cant find the chain then you'd have to ditch the sprockets, so this order makes sense. You would definately not have a problem finding a shaft (can machine) or bearings (thousands of em!)

    Make sure you get materials that can handle the torque of your rig. You have to consider shock and impact as well. Multiply the torque coming out of your yokes by ten. That should be a good safety factor to start at, and if you find something stronger, good!

  8. #7
    Gears would work, but there to tempremental, if I strip the teeth off one, it's expensive and problematic to fix.

    With the Chain Drop, you can change ratio's in about 20min, and replace parts if need be cheaply.

    I'm looking to push roughly 700 ft/lbs torque, and need something beefier than a 205.

    I know combines use the chain drive for there pickup's, what kind would a guy need to handle the torque.?

  9. #8
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    you say you use it for mostly trail driving and mud bogging? so what else are you doing with it? you do NOT want to drive that thing on pavement with a chain and sprocket setup, not even a little bit. also its a very simple design but the building of one isn`t so simple, if your still hellbent on a chain box link me to a canadian industrial parts supplier online and i`ll show ya everything you need.
    2010 Dodge Ram, chock full of Labrador and chainsaw

  10. #9
    This thing isn't close to street legal anyhow, and there isn't any diferent between driving it, or a full time just un lock the front hubs and let the shaft spin..

    As for a supplier, not even a clue where to start looking..

  11. #10
    Registered User Dan's Avatar
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    So you're looking for a monster truck type transfer case, so you can run serious amounts of lift and have good driveshaft angles.

    I dont know where to find them, but they're made by SCS Machine and ProFab Machine.

    The reason for the chain drive instead of three gears is so the driveshafts will run in the right direction. Otherwise you have to put the engine and transmission in backwards
    Professional Driver on a Closed Course. Do Not Attempt.

    92 YJ. Its not Gord's anymore.

  12. #11
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    Originally posted by Dan
    The reason for the chain drive instead of three gears is so the driveshafts will run in the right direction. Otherwise you have to put the engine and transmission in backwards
    What about 2 gears?
    '07 Wrangler

  13. #12
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    Originally posted by Joe M


    What about 2 gears?
    It'd be kinda funny to watch...it'd be a pretty loud snap when the front and rear axle try to go opposite directions
    Caswell

    1998 TJ - 5.5" lift, Dynatracs, 40s.

  14. #13
    Profabs are great but they run about $2500, and have the quick change gears in them, I'm not looking for that fancy.

    So you have a better picture, a chain drop looks like a bike chain setup. Two sprockets, and a chain.. Just ALOT bigger..

  15. #14
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    Try Western Equipment 604-278-3835 Richmond, or www.westernequipmentltd.com.
    Section 30 of their catalog shows chain and sprockets.

  16. #15
    Registered User Dan's Avatar
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    Originally posted by Goof


    It'd be kinda funny to watch...it'd be a pretty loud snap when the front and rear axle try to go opposite directions
    Actually the axles would both run the same direction, since the box we're talking about here drives both the front and rear axles off the bottom gear, but you'd have one forward gear, and three or more reverse gears :P
    Professional Driver on a Closed Course. Do Not Attempt.

    92 YJ. Its not Gord's anymore.

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