FTE Code Decoder says I have 3.55LS...
Senior User
Joined: Mar 2008
Posts: 360
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actually i like my 355s much better than the 373s in my wifes 4x4. 355s are highway gears, so you get much better fuel mileage. I've raced a few trucks with 5.4 like mine except they had 373s and i beat them off the line every time. But actually i do not think there is too much difference between the two gear sets. I'm just luck i guess because my 5.4 pulls like a horse.
More Turbo
Joined: May 2009
Posts: 604
Likes: 2
From: Inman KS
I also have 3.55 gears and 285 70 tires and there seems to be plenty of power. I have a SCT X3 from Mike at www.5startuning.com which also helps of course. I can beat my brother's 02 Chevy 5.3 with a Superchips tuner (brag brag). But i dont pull much either
Senior User
Joined: Apr 2009
Posts: 168
Likes: 0
From: Houston
I have 3.73 LS and can't complain to much. It is 2wd so I am not getting out in the mud/sand. Not towing or hauling so they are not being used for the original intent of this truck(to tow a small travel trailer). The rpms are alittle high on the highway but also seems the low rpm acceleration is somewhat lacking, stock.
Fleet Mechanic
Joined: Jan 2007
Posts: 1,293
Likes: 18
'The rpms are alittle high on the highway but also seems the low rpm acceleration is somewhat lacking, stock.'
This seems a bit incongruous. Acceleration should better with the lower gears. I wonder if there's a program at work in the engine computer restricting power application under certain conditions.
This seems a bit incongruous. Acceleration should better with the lower gears. I wonder if there's a program at work in the engine computer restricting power application under certain conditions.
Senior User
Joined: Apr 2009
Posts: 168
Likes: 0
From: Houston
'The rpms are alittle high on the highway but also seems the low rpm acceleration is somewhat lacking, stock.'
This seems a bit incongruous. Acceleration should better with the lower gears. I wonder if there's a program at work in the engine computer restricting power application under certain conditions.
This seems a bit incongruous. Acceleration should better with the lower gears. I wonder if there's a program at work in the engine computer restricting power application under certain conditions.
I know it is quicker than my 98 that had the 4.6L with 3.55 rear.Get myself a Gryphon is the next thing it looks like. Not sure if I want to spring for the supercharger and be without my truck for a week. Actually don't know if I trust myself enough to have a supercharger.
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