I have the two buttons on the low right side of my dash that say 4x4 and Low Range. When I put it in 4x4 it engages and works also when I shift to N and engage the low range it engages. When I put it in OD, D, 1, R, with the low range engaged it pulls itself forward or when in R it pulls itself backwards. I have to ride the brake to stop it and when it stops I have to hold it down to keep it from moving. Is this how its supposed to be? It only does it in 4x4 when low range is engaged. Sorry if this is a dumb question.