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[QUOTE]Originally posted by T e x: [QB] [QUOTE]Originally posted by Purl Gurl: [qb] "wiley, is a "brownie" installed in the drivetrain?" I asked about this. A "Brownie" dates back many decades, very popular forties through sixties. A Brownie is a two speed transmission, most often an underdrive and overdrive gear arrangement. These are fitted to two ton and up trucks, very common in eighteen wheeler trucks, long ago. Underdrive and Overdrive, like a transmission with only first gear and overdrive (like fifth) Those are coupled, usually, with an eight speed transmission, making for sixteen gears. [IMG]http://www.purlgurl.net/allstock/trans.jpg[/IMG] This is the arrangement for our old '56 4X4 Chevy. Eventually, when we drop the engine and driveline into its open frame, I will photograph this for you to see. Open frame means just a rolling frame without the body, bed, fenders, all that. There are three transmissions. Factory, there are only two transmissions. We had a "Ranger" two speed tranmission custom made. We will use the original General Motors SM420 transmission which is the 175 pound 4 speed with first gear being a "Granny Gear." Following this, a custom adapted Dana 20 tranmission / tranfer case from a Jeep truck, circa 1967 - 1977 years. The Ranger has two gears. Overdrive is just like overdrive in a car or truck; a very high gear. This one is 33% overdrive, a 1:1.33 ratio. It also has a direct drive which is simply 1:1 ratio, no change. The SM420 has four gears, with the first gear a Granny Gear, 8 to 1 underdrive; extremely low. Other three gears are just like an ordinary three speed transmission in old pickup trucks. The Dana 20 is a combination transmission and a transfer case. Two gears, a 2:1 underdrive, fairly low, and direct drive, no change. The transfer part simply means the power can be split to the front axle and to the rear axle or to both axles. Here is an example. Ranger is in direct. SM420 is in first. Dana is in underdrive. SM420 is 8:1 reduction, Dana is 2:1 reduction. Net result is a 16:1 reduction. Another way, the engine spins 16 times for every spin of the driveshaft. Add a 4:56 axle gear, you end turning 3,000 rpm and moving 2 miles per hour. Otherwords, floored, fastest you go is 5 mph. Opposite end is Ranger in overdrive, SM420 in fourth (high gear) and Dana in direct. For one spin of the engine, the driveshaft spins 1.33 times. This is a very high gear, a significant overdrive. At 2,500 rpm the truck will doing about 70 mph. Here are the possible gear combinations, (Ranger SM402 Dana) direct first under direct first direct over first under over first direct direct second under direct second direct over second under over second direct direct third under direct third direct over third under over third direct direct fourth under direct fourth direct over fourth under over fourth direct direct reverse under direct reverse direct over reverse under over reverse direct Twenty total gear combinations. Normally we exclude reverse and label this sixteen gears. The "twin shift" Dana allows for front wheel drive only, rear wheel drive only or all four wheel drive. Installing twin old fashion parking brakes, this is the old long squeeze handle levers mounted like a floor shift, will allow us to lock up the rear left, causing the truck to "tractor" to the left, or the same for right, resulting in "tractor steering" to the right. This can only be done on slippery stuff, like sand, mud, snow, whatever. A Warn winch will be on front with an ability to run the cable forward, or under the truck to the rear; pulls in either direction. Typical "slip box" trailer hitch will be on both front and back bumpers. We can tow a trailer, or turn around push a trailer. This will allow us to hook a trailer to the front bumper, then use the winch to pull heavy items up and onto the trailer, like a car or stump. Billyray is extending the frame and cab 18 inches. We will have a "extra cab" truck when finished. Gas tank is behind the seat. We picked up another gas tank. The extra length will allow dual tanks behind the seat, total 38 gallon capacity. Air conditioned, bucket seats, powerful stereo, we are good to go! All those gear shift levers, though, I am not sure, at my age, I am still agile enough to have sex in our truck. We will manage, somehow. We are designing a truck to use to trailer old cars or show cars. Many old cars, rust buckets, are often out in the boonies, sold as-is and where-is. Those cars do not run, flat tires, trees pushing up through the hood. With a truck like we are building, we can access even the most remote cars in very difficult situations. The truck will get about 22 to 24 miles per gallon without a trailer. Probably 16 to 18 pulling a loaded trailer. Slow truck with a six cylinder but will jerk the bumper off your car with the engine simply at idle speed. We are painting the truck all white with a gray and black interior. Finished oak bed. Basically, this truck will be a mininature big rig with four wheel drive. Taha [/qb][/QUOTE]ya, same "principle," mulitplied... we should collaborate...your pix, my "prose"; your pix & prose, my copyediting...whatever... great article for prolly 5-6 magazines.... by now you have seen some of my work on da web, yes? [/QB][/QUOTE]
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