cjg454ss

iTrader: (27)

truck is a stock 2010 4x2 crew cab XFE with a 5.3/A6, lowered on 22s, bed cover

stock gear was a 3.08

driving to work and for the first 5 months of owning the truck i got 18.5 mpg, the drive consists of some stop and go and alot of 50-60mph driving

i recently installed some 3.90 gears

the same drive to work netted me 24.5 mpg on 87 octane! I have tuned the truck with Hptuners to optimize the active displacement. I also tuned the A6, removed the TM and zeroed the converter slip, a handful of other changes. the truck cruises effortlessly in V4 mode.

ill continue to test results this week and see how it does, i expected it to fall in the 22mpg range. 24mpg was a shock,


hope this helps anyone deciding on changing some gears. i really only changed them to help tow my camaro.

GSXRDAVE21

where did you get the gears and how much ??? I HAVE A 4X4 THOUGH ON 33"S

cjg454ss

iTrader: (27)

ebay gears, 3.90, 4.10s were too much money

gears 110 shipped new
pinion bearing 86.19 from dealer
55.00 ratch install kit from summit
125.00 install, friend i usually use

gears are as quiet as stock, but the truck runs like it should.

slammed89swb

Gotta love a full-size truck on 22's that gets 24mpg! Hows it run with the skinny pedal to the floor?

cjg454ss

iTrader: (27)

it seems better but i couldnt tell if it was faster, today i got on it the first time since the swap. but,... i was driving the jeep srt8 all day earlier so i couldnt tell. ill take it to the 1/8th mile thursday to see.

ig109

Damn, making me think maybe i dont need the 6.2 after all...

Coban

iTrader: (14)

IMO, the average from one trip isn't really a comparison to a 5-month average. Run it for at least a month and it'll probably drop down a little. Your guess at 22mpg or lower is probably closer to the real average.

Still, great results.

silverado1ss89

yup thats what im looking at right now.. just maybe buy a jeep srt8 and calling it a day... or a denali truck awd...

cjg454ss

iTrader: (27)

just drove again for lunch, 300 miles on the truck, 23.5 mpgs, i can actually pull hills in V4 mode.

silverado1ss89- jeep srt8s are a ton of fun. mine was for sale but i couldnt part with it. sucker runs low 7s all day with some spray. hard to beat that.

CDN SS

iTrader: (1)

Wow pull hills in V4 ........ can you elaborate on the afm tuning ?? ........do you think the gear swap also helps the truck stay in V4 ?


What cruise rpm to you get your best mileage at ? Towing with my old 5.3 truck it liked 2200 below that towing mileage fell off .trying to decide between 3.90's & 4.10's for my 2010 or tow in 5th withthe 3.42's