ok checked the belts, bolts, altenator. I played around with it and found that it makes the noise in 2wd only, 71+mph, anything under there is no noise, when i have to gun it to get up a ramp....... I have no clue on top or bottom, i am in the truck!

And if it's the valve slap, can i get to it? or even see it? I do my own work. Thanks

2001 Tan Kia Sportage, has a K&N air filter, Warn Hubs but there's nothing really special about it, but my 7 year old loves my KIA cuz she sits up high!