Quote Originally Posted by Quik View Post
i absolutely love my 6l80e. i have a 2010 5.3 6l80 342 truck. with no load behind it i get 24mpg on the highway. 17 average to work. pulling 7000lb trailer load im 13-15

from factory with a muffler truck dynod stock 25X RWHP 26X rwtq this was on a mustang dyno. AFR from factory was 11.8

i leaned it out some and gained rpm pull and added a few degrees of timing and it dyno'd 270rwhp/279rwtq on a mustang dyno. all stock minus a magnaflow 30" muffler runs on 93octane

i have little over 16k worht of miles with this configuration and doesnt skip a beat. im usually hauling atleast 5500lbs every other weekend

i had the trans shifting hard but after one day i realized it wasnt me. the 6l80 is a beast but in the wrong hands it can be burned up asap, if your smart it can last a long time. i couldnt imagine going back to a 3 or 4 speed trans again after having this 6 speed.

the new 5.3 is stout from factory others have seen nice gains going with headers and etc.
Thanks for the input. I also have 3.42 gears but in a ECSB 4X4. So far I love the 6 speed too. It doesn't hunt for gears but it's always in the right gear. I tow a 4000# boat a few time a year. so towing isn't my real worry. I don't know how it will stand up to reduced (or eliminated) TM with increases line pressure and shortened desired shift times. 10-15 rwhp and wrtq gains from a tune would be well worth the time and money. I will license the '11 as soon as 2.23 is released to the public. I'm just a bit leary of doing much to it myself, since I'm not familure with this motor/trans. I'm still thinking that I need to get it broke in and pay Allen a few $ to do it for me. If I feel like tweaking it a bit afterwards, I probably will as long as I can load the stock tune back in the unlikely event of a warranty issue.

I doubt that I will have any issues but with only 600 miles on it, I want to cover my all of bases.