2020 Freightliner Cascadia

Have you driven something good like the iShift? You might be surprised.

And if you can beat the amt, how many years of practice did that take and how much unnecessary fuel did you burn?

I still like shifting, but I couldn't beat an iShift in stop and go city driving. That's where they shine.

 

Lets just say i like to think i can beat it. Maybe i cant , who knows , i jsut hate the frickin things. I remeber them old car posters when they first made an auto tranny in cars , they used to advertise saying now women can drive since there is no gears to shift lol i just rather have a stick

 

How is it pulling loads?
How is your rear ratio?
Any issues?
Is it worth the cost of new truck?

 

It was a 2009 that I drove years ago. It was a great transmission back then and still is.

I think it had a 3.42 which works out to a 3.55 with a manual. The 475/1650 d13 pulled 80k loads just fine. I had no issues with them.

Worth the cost? Only you can answer that.

 

Can you explain what you mean by that statement?

 

I ran about 40k miles with setup you described in a company truck. Usually 40K plus Lbs and the mountains a lot. Overall fuel mpg averaged 7.8 to 8.2

 

I hope that wasn't his MPG'S...Lol!!!!

 

I hope that wasn't his MPG'S...Lol!!!!

 

I'm referring to the rear axle ratio that will give you equivalent engine revolutions at a given top speed. Let me explain (I'm not sure how basic I have to get, so forgive me if I tell you things that you already know.)

Your speed is dictated by your engine revs, transmission gear ratio, rear axle ratio and tire size (i.e number of revolutions.) An Eaton manual will typically have a .73 top gear ratio and an 11r22.5 tire will revolve 498 times per mile.

So the formula to figure this out is:
Speed(mph) = rpm * 60/(gear ratio * rear axle ratio * tire revolutions per mile)

So using that formula with an eaton manual, to travel down the road at 65mph at 1398 revs, you would need a 3.55 ratio:

65=1398*60/(.73 * 3.55 * 498).

Now an iShift has a different top gear ratio: .78. To get similar engine revs, you'd have to substitute a higher 3.42 axle ratio.

65=1439*60/(.78 * 3.42 * 498)

So an ishift equipped engine will go down the road at 65mph turning 1439rpm, which is similar to an 13spd/3.55 ratio which will give you 1398rpm. Eaton has a road speed calculator which enables you to play with different ratios.

Having done all that math, I now realize that a iShift/3.36 axle ratio would be more similar to a 13spd/3.55 (1413rpm vs 1398). Of course, there are all the other lower gears to consider as well.

 

P.S. My Volvo would have been more similar to a manual with a 3.70 rear end.

 

Same here but I have a 2019 running at 70 MPH. Did they add those things on the sides of the window to prevent water from creating a tornado effect on your side mirror when it rains? My 19 has that problem and I saw a pic of the 2020 trucks adding a vent like thing to prevent that problem.