13 speed shift pattern confusion, how did I miss this?

That's low, or granny gear. For pulling out on hills with heavy loads.

I've heard it called a cheater gear also. According to some, you can use that gear in high range also. Others will say absolutely do not use it in high range. I've never tried it myself, others have told me it's handy at times.
I always figured that if Eaton Fuller doesn't recommend it, it probably isn't a good idea. Hence the reason on the shift pattern sticker it only shows that gear as LO.

 

That be the "mystery gear". It eliminates going to the low side, and I used it all the time. The reason they don't recommend using it, it eliminates reverse gear clash, but it's a gear like any other.. I used it all the time.

 

I've only done it once by accident. Not sure how true it is but I've heard the gear is weak??

 

Nah, a gear is a gear. Actually, using 1st low range, makes up the "13". Ridgelines post is confusing, and if L wasn't used, it would be a 12 speed.

 

Don't forget, 3 in reverse too, if you dare,,, at least the old ones, you could split reverse.

 

Dear lord, ive used high range reverse and the truck liked it better than the driver did, 3rd gear reverse seems like it wouldnt go slower than 35 mph, cause high reverse by the time the clutch was out of the way was easily 20 mph no throttle