4WD engagement timing

[pscheers]

i know of some guys that had to switch there acuator m becasue when they were plowing , adn they would push snow banks back the snow would land on the acuator and disengage it , leaving them stuck , there is a kit that u can buy that converts it to a manual engage method , no acuator , just lever and pin i think.. but i do know there is a kit , becasuse i was going to install one on my 89 k1500 but i sold it