<div dir="ltr">Lets find out for sure what's in the truck now. Look for a RPO sticker in the glove box, post a list (or just a photo of the sticker) and we can look up all the options installed on the truck at the factory. Then you can decide where to start your upgrade path. Just a warning. The cheapest and easiest path is usually to go buy a bigger truck. I had the same experience with my 1/2 ton Suburban. I loved it till I had to pull a heavy trailer up hills on the interstate. For my situation a 3/4 ton Suburban with a big block motor solved all my issues without ever turning a wrench!<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Apr 2, 2017 at 6:53 PM, Dave Cavanaugh <span dir="ltr"><<a href="mailto:cavanadd@frontier.com" target="_blank">cavanadd@frontier.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I have a 2004 GMC Sierra half ton, 2WD extended (not crew) cab. I believe it has a 5.3 Vortec engine, automatic transmission, unsure of the axle ratio. I'm the original owner, and it has about 74,000 miles on it. Other than the tires and radio, it is completely stock and is in generally very good shape. It fits my needs, and has been totally reliable to date, and I plan to keep it for the foreseeable future. It also has a Leer fiberglass canopy on it right now, but it'll probably come off when I finish my move later this year. It's not my daily driver; I typically use it to pick up lumber, construction supplies and other routine truck duties. I typically don't do much towing, and I have never been unhappy with the performance until last year when I started making multiple trips from Washington to Utah, usually towing an 8 to 12 foot UHaul trailer with my shop stuff in it. This trip includes several mountain passes and quite a bit of elevation change. The truck performs OK, but not great.<br>
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I don't have a boat or RV, and I'm not trying to turn it into a one ton hauler; I would just like some suggestions as to possible mods I could have done to the engine to improve the performance and, if possible, improve the gas mileage. It generally gets about 16 MPG on these trips. Any ideas?<br>
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