13 speed transmission shift pattern
 

can someone tell me what it is? or know where a good picture is? thanks a

Re: 13 speed transmission shift pattern
 

oh THANK YOU SO MUCH!!!!!!!!!!!!!!!!!!!!!!!!!!
 

A MILLION THANKS!!

I ask because
 

I was looking on EBAY for a "plate" for a friend/gift and there is one that looked more like a 15 speed and the seller swears its a 13 spd. EATON he claims....a

Re: I ask because
 

It was probably for the old Eaton 6613 transmission so he's not pulling your leg. That was an oddball from transmission years back that had a pattern similar to the Eaton 15 speed (10 speed with double reduction low-low range) but because of the same type of overlapping ratios, it had 13 available progressive ratios. The shift knob had a traditional high-low range shift and a thumb switch on the knob for shifting back and forth from double reduction.


You shifted it like this:

DR1-DR2-DR3-DR4-DR5-(shift thumb switch from DR to low)-3-4-5 (range change)6-7-8-9-10

or

DR1-DR2-DR3-(shift thumb switch from DD to low)-1-2-3-4-5 (range change) 6-7-8-9-10.

This is similar to the way the Eaton 15 speed is shifted, except the 15 speed only has 12 progressive ratios, instead of 13. The 6613 went out of production about 20 years ago. The proper plate for a regular 13 speed would look like the one I posted above.

It's interesting that Eaton chose to call it's 15 speed transmissions "15 speed" despite the fact that you could only truly get 12 speeds out of it. :lol: :lol:

FWIW, Eaton used to use a 3 position splitter button for the 13 speed instead of the 2 position/range change that we're more familiar with today. The 3 positions were "Low", "Direct" and "Overdrive". The extra "low" position took place of the range change button. When you went from "Low" range to "High" range, you shifted the button from "Low" in 4th to "Direct" in 5th, then proceeded to split gears 5 through 8 shifting between "Direct" and "Overdrive". :shock:

WHOA!
 

ALL THAT SHIFTEN WENT RIGHT OVER MY HEAD. But thanks so much for your knowledge and time to type it out. much appreciated!!a

Re: WHOA!
 

LOL. It's my day off and I have nothing else to do. :)

As I've only driven 9, and 10 speeds. What would be the benefit of a 13 speed, over a 10 speed?

More flexibility. A 17% split between gears in a 13 speed makes it easier to keep the engine running in it's efficient sweet spot range than a 35% step on a 9 or 10 speed.

Thank you very much for the explanation. As with anything, I guess it just requires practice.