Ok, I think I got an idea how this works but I’m sure someone here can enlighten me. What am I gaining, aside from what I’m guessing as some duplicate gears and overlapping? I’m guessing that the auxiliary works in, deep reduction too? How is this rigged up in the cab and underneath?
15 speed and 4 speed auxiliary
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mile marker 27, Aug 5, 2022.
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Depends on the ratio set of the aux. Ours is a double under low gear and overdrive in high. For the most part hang it in 3rd and your good to go. It was put behind the 15 to give it a lot more reduction and to still stay with a set of overdrive boxes. The deep for the 15 is on the dash and for whatever reason Pop would not use it rolling. Or maybe I’m thinking of the ol S series IH knuckle boom truck that had a deep switch beside the seat he told me not to use rolling. It’s been a hot minute lmao.
I do know he would start in under and 2nd soon as it was rolling he would bump to direct run it out to 9th and spilt 9 and 10 with aux. never seen him use the deep side of the 15. With both of them in overdrive the only thing I would pass them is a 9 over with a 4 behind it. But with .73 driving a .79 they get real Geary feeling.
His is a cable shift set up but I have seen air shifted as well. 3.55’s in the tears on tall rubber. Only time I seen it in double under was coming outta of a pit in a coal mine in South Arkansas back in the day. Rarely seen them both in OD, with both against the dash it brings a whole new meaning to never late with a 3408.Diesel Dave, Cat sdp, beastr123 and 3 others Thank this. -
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Bean Jr., mile marker 27, D.Tibbitt and 1 other person Thank this.
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beastr123, mile marker 27, D.Tibbitt and 1 other person Thank this.
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I have nothing to add to this post other than I recently hauled a winch truck from the nm oil fields to the auction yard in PHX. And it had a 13 and a 4. I thought that was pretty cool. That was the first twin stick truck I ever got the honor of putzing around a yard at 10mph .
Cat sdp, mile marker 27, rollin coal and 3 others Thank this. -
Bean Jr., Diesel Dave, beastr123 and 3 others Thank this.
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