After going to 4:56 from 3:07 I have a strange, almost harmonic noise that comes in and out, about 70 mph. It seems to be in the rear but hard to tell. Quick Details, 97 Xj 8" Skyjacker lift, Tera SYE, 5-speed AX 15 I think Running 33's. Tru-trac front HP 30, open 8.25 rear. Noise is not steady...