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Old 06-09-2003, 01:26 PM   #1 (permalink)
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Profab or alternate Drop Box

Has anyone used either...??

I use my truck only offroad, and have an engine capable of 8000rpm. So I'm wondering if there would be any problem running just a drop box, instead of a transfer case or doubler.?

With the drop box you would have your option of a 3:1 gear ratio, or 4:1.

I currently have a SM420, and 4.56 gears. This would give me a crawl of approx 94:1..

Has anyone tried this, or had problems..??
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Old 06-09-2003, 01:48 PM   #2 (permalink)
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Quote:
Profab or alternate Drop Box
I've never heard of either ... is it some sort of chain drive deal like 4x4 pulling trucks have or what ?

- jack
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Old 06-09-2003, 01:57 PM   #3 (permalink)
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Profab is the manufacturer that makes the chain style drop box for the Monster trucks. They use a simple removable gear system instead of the adjustable transfer case.

With this system you don't have the inside option of low or high, your just in gear.

If you don't like your top speed, or bottom speed, just change the gear. Since most don't us high range that often offroad seem so much simpler to me..
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Old 06-09-2003, 02:38 PM   #4 (permalink)
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depends on the price and the type of wheeling you do. Being stuck in 3 or 4:1 all the time would get real old, even in fourth gear you won't be setting any speed records. If you don't need insane low I guess 2.5:1 might be livable, and should crawl allright with a 420
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Old 06-09-2003, 02:44 PM   #5 (permalink)
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That's what I'm thinking.. They cost roughly $300-$400 to build, where as a doubler is twice that or more..

I was wondering if anyone knew a downside..??
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Old 06-09-2003, 03:12 PM   #6 (permalink)
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what kind of milage can you expect out of them? Wear and tear could be a problem
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Old 06-09-2003, 04:02 PM   #7 (permalink)
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Mileage offroad? Hmmm... How about hours per gallon...
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Old 06-09-2003, 04:38 PM   #8 (permalink)
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Originally posted by 1988YJ
Mileage offroad? Hmmm... How about hours per gallon...
I didnt mean gas milage, but how many miles he would go before the chain drive wore out. If these things are designed for monster trucks they are designed to run 300 ft at a time, at that rate they probably see only a few miles of actual load a year.
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Old 06-09-2003, 04:56 PM   #9 (permalink)
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i know someone that has a used profab case for sale. he wants $1000 bucks for it.
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Old 06-10-2003, 08:04 AM   #10 (permalink)
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Well looking into it a little farther, and inquiring about longevity..

Depending on how you build it, either exposed or encased, will depend on how long the unit will last. By using 1 large and 1 small gear with a double 80 chain you should be able to see approx 2yrs of life out of an exposed unit. Being that regular maintenance is done. Wash in out and oil it..
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