15 speed and 4 speed auxiliary

@wore out

 

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.

 

A 15spd in deep and an auxiliary in the 2.37 first will wind an 1810 shaft tight enough to pull the slip yoke out. RTO 14715 with a 1241C auxiliary gives you 65mph at 1600rpm on 22.5’s with 4.30. Same as a 1406A-1241C set. Deep reduction and the lo in the a-box is an either or situation. With 4.30 I can lift off with a train at 139,000 in 3+1 comfortably.

 

I got a friend that picked up a set of box's 6&4 with a 7 box behind them ... I have no idea what kinda witch craft he's conjured up .. but Iam sure it will be interesting.. I have never seen a 7 box behind a 6&4.. maybe you have .. since you get around more than me

 

Sound like voodoo to me

 

If you only knew this guy..
Voodoo is a understatement

 

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 .

 

That ain't a bad old looking mule .. for being in the oil patch