shifting a 15

Before the fancy colored buttons we had a chrome shift knob with 1 button, marked LO/Intermediate/Direct on these style trans. Drove one in a 70's International, always worked good.

 

You couldn't give me one basically useless.that being said they are very easy to shift and hard to mess up on

 

I drove a 91' Pete 379 with that box in it. It was the smoothest gear jammer I ever drove. The shifts floated right in the pocket as long as the RPMs were good for it.

When I first drove it the guy I met with explained it was just like a 5 speed in a car. Just switch the 4th and 5th gear slots and your rolling. Like everybody said, the 5th and 10th are the top right hole going toward the dash. Never use the low reduction 5 gears unless your HH or offroad. Piece of cake and once you learn to float it and use the Jake brake you'll be making music.

 

I bought a 1980 Freightliner with a 15 speed 4.10 rears on 11r 24.5 rubber. Took me a couple upshifts to figure out 4&5 were flipped in this truck. It appears that when using deep reduction, (which is much needed when loaded, due to the very high first gear) that 2nd Deep is slightly slower than 1st gear, same with 3rd Deep is slightly slower than 2nd gear and so on.

It's a nice transmission because it's so tight, but Would much prefer a 13 or 18 in the truck.