How do you shift a 15 speed fuller transmission?

Well I have never tried to explain this in writing but here goes.

First your range selector needs to be in the down position (The black switch on the front of the shifter). Second the little blue switch on the left side needs to be back. About the little blue one

• it can be set up for reduction on the low as well as the high

side, so I can not walk you through your exact application. We will be talking about the deep reduction (blue switch) being on the low side. Also the actual gears can be a standard shift (dwn, over & up, then dwn and so forth) or the horse shoe style in which 3 & 4 are on the bottom and are side by side. Lets go with the standard.

O.K. clarifications to the side brings us to step 3. Press the clutch and place the shifter in 1st gear (mid upper) ease the clutch out and accel. Just about the point where you would press the clutch to shift - place your hand on the shifter and put a little pressure towards your next gear (drop down past neutral and into 2nd) as your foot releases acceleration the shifter will pull out of gear and depending on your exact application fall into the next gear (You will probably grind it until you get the timing down) repeat this basic concept until you get to 4th gear (5th if your trans has 1st as a low gear <which would be the position down and all the way to the left>) Now you are moving at about 25 MPH and it is time to go to your high gears. Your still on the throttle - flip up the black range lever and then put slight pressure pulling backwards on the shifter. Release the accelerator and you will hear a smooth quick clunk sound coming from the top of the tranny (it is in high gear range) place the selector in the 1st gear position (bottom left or top middle depending on where your 1st gear is). And basically repeat the previous steps until you get to the gear and speed you are trying to achieve.

You thought I forgot? The little blue one. This is the hard part to explain. Try not to think of the gears as whole gears. At this part think of them as gears that have two halves. The blue switch is a splitter. It splits the gears closing the large difference between shift points to allow you to catch gears quicker under heavy loads. We are going to assume your splitter is setup for the low side. Your in, say, 1st. the range is down, and the splitter is towards the back. While accelerating flip the splitter forward and KEEP IT IN GEAR AND CONSTANT THROTTLE. As soon as you pull it out of gear and start towards 2nd it is going to split the next gear (2nd) so you will have to give it about half throttle to catch it. Once you got it, and are accelerating, simply pull the splitter backwards and ease off the throttle it will shift into true 2nd gear automatically. It takes a lot of practice to get this down without grindiing. I tell all of my trainees to try to ease their minds when they first start learning "If you cant find it- Grind it" these trannys can take a lot of punishment UNLOADED. If you are loaded, don't try learning. You will certainly tear something up.

I agree with everything you said except the use of the blue deep reduction lever. It's not like a splitter in a 13 or 18 speed. For example lets say you start off in 1st with the blue lever forward (which is deep reduction engaged). You then shift through all 5 gears in the low side(not moving the blue lever, leave it forward). Then, to get out of deep reduction, pull the blue lever back and shift to 4th. That would be around a 30% step, the same as all of the other shifts. If you leave it in 5th and shift out of deep reduction, then you better be going down hill with a tail wind LOL!