im not sure which one it is, its been 30 degrees in louisiana for the past week and i am not getting under that damn truck right now to check but ill have to look into it, ok so here are the side effects, when i have the front drive shaft in and i try to put it in 4 high, the light just blinks but when i put it in 4 low then go from drive to park, i hear something grind then goes into 4low but i dont think its actually locking up the front wheels because i when up to a parking spot and tried easing over the curb and the back tires just started to spin but its defidently in 4low gear ratio because it sits at a crawl......any ideas?