hey i am new to offroading and just bought a 1990 chevy 1500 with a 4" body lift, 31 goodyear A/T and whenever i try and engage the 4 low it grinds. I got it in once and its not a loud grind but still a grind. When i engage the low i come to a stop(obviously) put it in neutral(i tried it in park, same thing) and try and engage. When i engage four high in neutral its fine, so i guess i'm just asking if there is something i'm doing wrong for the low