Shifting a 15 speed?

I never could find out why the difference in the two trannys...the one that stays with the regular "H" pattern is called a "15"..the one where it reverses top two gears is called "15 under"...I gave up trying to get answers to this long ago....maybe it is for left handed blonde female types..
ROFLMA

 

I have a 15 speed in my 87 Star and 4/5 is backwards. High is to the dash. That to me is a 15 over cause when u shift it into high the rpms drop. Just like an automatic overdrive in todays vehicles. Mine shifs like this

R 2 5
1 3 4

R 7 10
6 8 9

R 12 15
11 13 14

 

None taken...I have always been taught that the number of FORWARD gears determines the name on the gear box...therefore "LO" being a forward gear is 1st...always. Since 4 decades ago my grandfather and his best freind in Ely, NV on a cattle ranch showed me the 3 stick brownie, and we used "granny" to walk along the side of the truck loading hay bales, there hasn't been a "granny gear" in a transmission...somewhere along the way granny became LOW..maybe granny was upset using her name.

In the 13 I am in today...I have had to use 1st..once, only becuse of being stopped on a decent incline, and loaded max (79,994) I didn't even try anything but 1st to get moving. So your worry of me not driving your truck, or any other truck CORRECTLY, efficiently, and as if it were my own, is unwarrented. I always start out without shudder, nor with a need to over rev with a slow release of the clutch like many newbies do when learning a cluch. 2nd or 3rd, and in this setup I have today..even with an mt trailer 4th is too high...4th even bobtail seems a bit high unless downhill.

 

Looking back at it, I was referring to using an 18 speed tranny...never seeing the lowest group unless on a decent incline from a full stop to get going. I did have the occasion to use the 3 in a 15under once..coming out of a paper mill on the OR coast...stop sign top of a steep hill...very steep hill onto the highway out of the mill..wasn't timing the traffic well enough..had to stop...those bottom gears are a real "son of a gun" to get through smoothly I found out the hard way!

And if you think you're slightly confused now....give it 20 years and get back to me on it!

 

Selecting a starting gear is very simple. Start the truck moving from a standstill at the slowest engine speed that will move the load. You never slip the clutch to move the truck unless your on a hill and stuck. You apply power after all the running gear is engaged so you don't damage any parts. I have never ever had to use 1st gear to move a load and I've had some heavy ones up around 120,000lbs.

 

We had one but it would only run in 1st and 15 so you went uphill slow and downhill like a Bat out of hell.

Alabama teachers are on strike util pay gets lots more better.

 

Depends on whether its a regular 15 spd or a deep reduction 15 spd. The regular 15 is the same as a 13 except that its based on a 10 spd instead of a 9. A deep reduction 15 is essentially a 10 spd with extra short gears in low range. 1st gear in a b ratio eaton is 11.06:1. In a deep reduction 15 its more like 7:1, but with the deep reduction in it goes to 13.3:1. (that's if the transmission is overdrive, if its direct drive the gears are even lower) If you can only move the splitter button back and forth with the rangefinder down, its a deep reduction model. If it only moves with the rangefinder up, then its a regular 15 spd. With a regular 15, you run through the gears in low range and in high range then it becomes like a super 10 where you split every gear, although the gears are much closer if you split them. With a deep reduction 15, if you start out in deep reduction to get it out of deep you shift up to at least second gear, then move the button back, come out of gear and let the engine idle down and go into the next LOWEST gear. For instance, get it into 3rd, button back, stick to neutral, idle down, stick into 2nd and youre out of deep reduction. You can go 2nd to 1st, 3rd to 2nd, 4th to 3rd, 5th to 4th whatever gear you choose when you want out of deep reduction. You can even skip (deep 5th right into 5th out of deep reduction) but you still either have to come out of gear or use the clutch or else it makes one helluva clunk when it goes in. Whichever transmission it is, you need to make sure that the top two gears aren't reversed (overdrive pattern). Sorry it's long winded but when i first got into the truck im usin now it took a little research to figure it out because the guy who used it before me had no idea what it was..once you get used to it its not bad at all...