How to identify if a transmission is double OD

You probably will not see that one as it is the only one I ever saw. That was a big machine. The tires were about 4 1/2 or 5 feet tall.
In road trucks I want to say they shift like a 9 speed could be different patterns. Then there are the deep reduction gears great for getting out of a hole. Some folks just never seem to figure out how to get from deep reduction, LL, to low without stopping or raking gears really bad.

 

My memories of a 15 speed was riding with my Gramps (R.I.P. "Milk Jockey") in his 82 Ford L9000. Day cab pulling a Timpte hopper bottom. 350 Big Cam with Dayton wheels, New Way air ride with "Canadian Spread" tandems. Coming up out of Brookville way overloaded, my probably five year old self wondering what he was grabbing towards floor as we got into the low side, why they put deep reduction/splitter down there is beyond me.

 

Door decal should tell you what shift pattern it is unless it was swapped. RTX is an over with the direct shift pattern. 15 speed is either RT, RTO or the RTX. RTOO is a 13 or 18spd with a natural overdrive high gear in the main section and another in the auxiliary section. You’re in overdrive already with the auxiliary still in direct. The overdrive split is the second over.

 

LL is deep reduction. Look at the shift pattern your posted.
Looks like you have a standard 15 speed. Shift pattern in progression may change with different torque ratings and such? Odd I have never seen a pattern listed for shifting gears from top to bottom in a 15 speed. Directions are as if you have to stop in order to shift from LL to L.
Great transmissions for what you are doing.

 

I did not say that. I said as if. On post 14 why does it not show how to go from LL to L? That is what I meant.
However I was incorrect about never seeing that shift pattern listed. The oil drilling rig had it listed.

 

I have a tough time believing that is a triple digit truck with 4:25 gears even if it's on 24.5 rubber .. unless you had that motor just screaming.. I just don't think so