I have a HUMMER H3 .2007.......... 5 speed manual transmission .only 700 mile on itt ................when i shift 1st shift into 2-nd (btw 2500rpm-3000rpm) making a noise like vibrating some pice of metal or something and it's happening the same thing btw 2-nd----and 3-rd shift (btw 2500 rpm --3000rpm).........btw 3rd-4th..shift.............and 4th-5th shift i don't hear any sound .......i .put in neutral and i accelerate 4000-5000rpm the engine sound it's ok ..only happening when i drive ............................i'm very upset ............anybody knows anything about this problem

700 Miles? Back to the dealer. Make it GM's problem.