My truck is lifted with 6 inch suspension and 3 inch body lifts and I'm rolling on 37in tires. My engine is the 5.8L and it has nearly 200K miles. I have no problem keeping up with traffic on the freeways, but my acceleration lags. Off the line and already moving it doesn't jam the way I think a 5.8L should. I just had a basic tune up done: plugs, wires, distributor, oil change, but there was no increase in power or gas mileage which is around 6 or 8 mpg. I also just had the Xfer case rebuilt. Is the power loss and low mpg normal, caused by having such high mileage, and/ or are there simple ways to get some horses back? If it makes a difference, I have dual exhaust too. I'm considering an engine rebuild, but do I also have to rebuild the tranny and any other stuff? Will I get noticeably more giddy-up or does it sound like an expensive way for minimal change? I have a friend that tells me it wont get the giddy-up I want cuz it's lifted and stuff. Any advice would be GREAT! Thanks a ton!
