1987 Mack twin stick

The front stick is the main transmission, The rear is the brownie. Put the main box in first or second dpending on your load then put your brownie in whatever gear you need to get it moving...Then just shift the brownie as you would a reguler tranny bear in mind that many brownies have a reverse shift pattern so read your shift pattern card on the dash or wherever it is. When you get to the highest gear in the brownie shift the main box to the next gear and the brownie to either low or second depending on the box and repeat this process till you get to the highest gear. As for downshifting...Reverse the process.

 

You don't have to...But I've done it in the past.
But if you don't shift'em square, You'll learn how to unstick them.

 

I bet it is a 5 speed on the first stick and HI-LO-and REVERSE and the second stick.

 

we have a twin stick Mack at the city I work for and the main stick is for the gears and the smaller is for reverse and forward.

 

That is what I thought. Good-luck. I bet you catch on to the transmission fairly quick.

 

I would guess its a 10 speed. Would you shift 1-2-3-4-5 then grab the other stick and put it in high then repeat the patern on the main stick Like you do with the range lever in a straight 10, or would you use the second stick to "split" every gear like you do in a super 10?

 

I am thinking that it is waht they rever to as a 6 spd but look at it this way you have 6 reveses the rev in 1st gear you can walk faster than the truck will roll if you get in it and try to shift like a reg cummins engine the rpms have to drop way down in order to shift Good luck and happy trucking ,you will be just fine after 1 day you will be able to shift blind folded .