Re: 08 is making a whining noise when stepping on the gas
Check the engine pulleys. Occasionally the belt tension pulley can cause a squeal/whine noise when under load. Normally with a pulley the noise will be more noticeable at idle. Otherwise, check out your transfer case and change out the fluid, even though you mentioned the truck has low mileage, but it won't hurt to check.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!