6-speed
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6-speed
Other than the obvious..........I wonder if you could make a six speed (four speed plus 2 overdrives) by hooking two NP435 transmissions back to back. Just the weird stuff I think about at night....... Dr. Frankenstien
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From: Maine
My great grandfather ran a coal and ice business, and, according to my grandfather, had a Model A with two transmissions. This was done to gear it WAY down for plowing and hauling heavy loads around the yard. According to my grandfather, though, the only way it worked was to run the second transmission in reverse. Therefore, it didn't add any extra ratios, just geared that truck way down lower using parts that were laying around the shop.
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my idea is to joint the two output shafts. The main trans and clutch would be in the normal location and the second one would be backwards from the first. Only one clutch would be needed since when shifting the second trans, the first trans would still be in gear and act as just a mechanical link to the second trans. What it would do, is when both transmissions are in 4th, it would be 1-1, but when you shifted the second trans into 3rd and 2nd, it would be overdrive and double overdrive respectfully. It would mainly come down to a 6 speed with a granny low and double overdrive. Granted, there is some engineering in volved in mating the two transmissions to each other, plus the driveline, but all that aside, I think it would work just fine.
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Of course, you could just buy a 5 or 6 speed trans and DRIVE your truck....
http://www.motivegear.com/tech_info/...nny_guide.html
http://www.motivegear.com/tech_info/...nny_guide.html
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Fleet Owner
Joined: Sep 2005
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From: Lake Tahoe, Nevada
If you connect the output shafts together, you will be driving the coast side of the gear teeth in the second transmission.
And if you are using two four speeds, you would have three overdrive gears. Unless you had a really low ratio in the diff. The two tallest trans gears would probably be unusable. Might work with a very powerful diesel.
A better setup might be to put the two transmissions in line and use a very tall rear end gear and large diameter tires.
And if you are using two four speeds, you would have three overdrive gears. Unless you had a really low ratio in the diff. The two tallest trans gears would probably be unusable. Might work with a very powerful diesel.
A better setup might be to put the two transmissions in line and use a very tall rear end gear and large diameter tires.
Last edited by Bdox; Sep 20, 2006 at 11:44 PM.
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Joined: Aug 2004
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From: Lynnwood, WA
Most everything is doable, as long as youi got deep pockets and lots of resources to throw at it, but of course that doesn't mean that they are practical, or make much sense. 
If you need lots of gears, the ZF5 will work with quite a few engines -- it has granny 1st and OD 5th for a nice, wide ratio. If you need more gears, a gear vendor under or overdrive can get you up to 10 gears that should be enough for most uses. Alternatively, you can get something with 4x4 that has a 4L range, so it effectively doubles the # of gears.
If you need lots of gears, the ZF5 will work with quite a few engines -- it has granny 1st and OD 5th for a nice, wide ratio. If you need more gears, a gear vendor under or overdrive can get you up to 10 gears that should be enough for most uses. Alternatively, you can get something with 4x4 that has a 4L range, so it effectively doubles the # of gears.