6l80/90

[AMERICAN PICK-UP]

Originally Posted by clinebarger

The 6LxxE transmissions are great, Though they constantly upshift & downshift.

Lower RPM's do not automatically mean better fuel mileage, I have a 6 speed Allison in my '06 Duramax, I get better mileage in 5th gear at 65mph than I do in 6th.

gm engineers think that lower rpm does translate into more mpg. so to get up to cafe fuel mileage standards that is why every 2014 silverado will come with the 6 speed tranny. but when they get out in real the world we will see what happens. i have a customer that just got his 2013 avalanche performance tuned to keep his 6l80e tranny from shifing up and down in town. he is happy with it after the tune but has not checked the mileage yet.

[Dova]

Originally Posted by AMERICAN PICK-UP

gm engineers think that lower rpm does translate into more mpg. so to get up to cafe fuel mileage standards that is why every 2014 silverado will come with the 6 speed tranny. but when they get out in real the world we will see what happens. i have a customer that just got his 2013 avalanche performance tuned to keep his 6l80e tranny from shifing up and down in town. he is happy with it after the tune but has not checked the mileage yet.

In our '09 crew cab 5.3 4x4 swb with stock tires on it we seen up to 25 mpg going from Washington State to Jonesboro AR to visit family. When I go to do this swap I may have to contact you in regards to an engine. My inlaws all live in Jonesboro area out to Egypt, right in your neck of the woods.

[AMERICAN PICK-UP]

Originally Posted by Dova

In our '09 crew cab 5.3 4x4 swb with stock tires on it we seen up to 25 mpg going from Washington State to Jonesboro AR to visit family. When I go to do this swap I may have to contact you in regards to an engine. My inlaws all live in Jonesboro area out to Egypt, right in your neck of the woods.

I have a few cousins in the egypt area.

[Mr. 250r]

Originally Posted by AMERICAN PICK-UP

gm engineers think that lower rpm does translate into more mpg. so to get up to cafe fuel mileage standards that is why every 2014 silverado will come with the 6 speed tranny. but when they get out in real the world we will see what happens. i have a customer that just got his 2013 avalanche performance tuned to keep his 6l80e tranny from shifing up and down in town. he is happy with it after the tune but has not checked the mileage yet.

Camaro skip shift anyone? Most annoying idea ever implemented lol and i wish they would drop the 5.3 and bring in the 5.5 already new body style should bring new motor, not saying i don't like the 5.3 but the 5.5 would be a great new motor for the new trucks

[AMERICAN PICK-UP]

Originally Posted by Mr. 250r

Camaro skip shift anyone? Most annoying idea ever implemented lol and i wish they would drop the 5.3 and bring in the 5.5 already new body style should bring new motor, not saying i don't like the 5.3 but the 5.5 would be a great new motor for the new trucks

I like the 5.3 the 2014 is up to 355 horse power!! alot more than a old 5.7 ever thought about. infact the 2014 4.3 v6 is a lsx engine for the first time. is 285 horsepower. should be a neat little v6.