5.3l

I have a 2014 GMC sierra 1500 C-cab short box 4x4 with the 5.3l and 3.42 diff gears. I have a 24 ft holiday trailer loaded about 5500 lbs and even on flat highway it is not surpassing 4th gear. I pulled my sisters trailer when their truck broke down and loaded it is 7700 lbs which is well within...

So I have a 2007 gmc yukon xl 5.3l v8. The 8 vin # is a 3. It's also a flexfuel. The motor is bad now my question is what other chevy or gmc motors are a straight swap. Or can I use a 5.3 with a different vin. I'm trying to keep it as simple as possible. I'm also having issues finding the same...

Hi, i have a 2010 GMC Sierra with the 5.3 in it, extended cab. And im looking to up the fuel economy and a little bit of power to play with. I was just curious on what other owners have chose to put in their trucks because there are so many options to choose from.

Dealer says use oil life, so i've been going by oil life. Truck has 83,000 km. At 30% oil life and 9500 km since last oil change, oil level was down (caught me by surprise being a newer vehicle, I don't check oil as often as I should and now I will) at tip of dipstick. Added a litre and still...