1998 dodge dakota 4x4 front end binding in snow while braking

Just took a recently bought 98 dakota out in some
snow, when I throw it in 4hi, and apply the brakes
relatively hard, it seems like the front end is binding
up, similar feeling to making a turn with 4x4 on on
dry pavement (yes I know this is a nono, that's why
I'm concerned.) I am driving in a straight line when
braking, and if I feather the brakes it's fine, only
when I press firmly does it do this binding, jerking
thing, and only in 4wd. Is this just abs working in
conjunction with the locked wheels? A traction
control thing? Seems really harsh on the truck,
again feels and sounds similar to a bind in 4x4
while turning, really jerky, so I have a hard time
believing it's just abs. My rotors and pads are fine,
seems like it only occurs in 4wd. Any input would
be appreciated thanks.