So i just got a 2005 GMC Yukon 5.3L . It has zero problems, it just has the worst low end i have ever seen in Yukon. So my friends Yukon whenever he floors it, the tires scream a bit. But mine just takes a long time to accelerate but once the rpm goes past 3500-4500 it becomes normal. What is wrong with it?
and Whats The best modification i can add to it?
Best ECU
Manifolds
exhaust system
Spark plugs... anything that would make it faster?
Do a tune-up maybe..Some of these trucks have different gears for different jobs. Not sure but i think for that type of Suv they start at 3.23 for very light towing situations. 3.73 or 4.10 are usually better for towing and that might be the problem..your buddy has a better gears. If you're really serious you can find out what gear ratio you have by the codes you have and look them up online. Changing the gears and you will notice a difference but also in gas mileage too.
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