Saw pictures on the Detroit mechanics forum of the results of letting the Detroit AMT DT12 do its magic.
Fellow just let it do it’s thing going down a mountain, at near 2500 rpm he heard a strange knocking sound, drove it to a a Freightliner shop. Had a connecting rod let go and punch a hole in the block.
No warranty for driver abuse.
Fuel Mileage - Automatic vs. Manual
Discussion in 'Trucks [ Eighteen Wheelers ]' started by FloridaDudester, Jul 19, 2019.
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Are you a troll?
Might be way off base here, but I think most of us old farts got that AMT thing figured out pretty good.
D is for make the truck go forward
N means don't do nuthin
R means go the other way
A Chevy 2 speed auto from the 1950's was a little more complicated.
P
R
N
D
Ljaffles, stillwurkin and MartinFromBC Thank this. -
Yeah you have to watch the RPMs you will get a dash warning if you get the RPMs to high. You then have push the brake pedal and slow down. Sounds like that driver went higher then 2500. You get the warning about slowing down at like 2400 RPMs
uncleal13 and MartinFromBC Thank this. -
MartinFromBC Thanks this.
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Another thing drivers do, is they turn the engine brake on and off as needed. When you do that on DT-12 transmission it will go into Ecoast. Then drivers say it not safe becuse it going down hill in neutral.
You can't do it like that, you have leave the engine brake on all the way down hill. Then you have drivers using engine brake in the snow. Same thing they turn it on and off like regular transmission. Then they don't like how it drops a gear because I they say that unsafe in the snow or ice. When they should never use the engine brake in the snow or ice. But you could get alway with that in regular transmission.Last edited: Jul 21, 2019
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It dont make a difference to me in terms of fuel mileage. Many people will vouch for manual because of what they are used to. Its really all the same. Its all in your rpms
MartinFromBC Thanks this. -
Automatics generally will not allow the engine to exceed redline. -
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