I don't know what going on but anytime I'm going up hill between 3rd an 5th gears I get a knocking noise from the truck underneath as if my Engine was going to throw a rod during low end torque! Now I know they don't have push rods? At least I don't think so...... but has anyone else ever heard of this problem? PLEASE HELP ME???

 

I looked at your profile to determine what vehicle you’re talking about so a 2019 f-150 lariat with a 3.5L eco boost I can’t really determine all the modifications you have from your list but I think you have aftermarket exhaust so maybe you should check the exhaust hangers…if you bought the truck new with a basic 3 yr/36,000 mile warranty I’m guessing you’re out of warranty however if your truck is below 60,000 miles you could be covered under the 60,000 mile drivetrain warranty that covers engine, transmission driveshaft and axles.

you should consider changing your format signature show your vehicle year, model, options, 2x4 or 4x4, mods etc.

Good Luck