i recently toasted the np231 out of my 90 yj and replaced it with an np242 that i found (posted in a prior thread). the 231 tc had the vacuum controller on it where as the 242 has an electronic one. so now my front axle doesn't really help me out too much as far wheelin is concerned. thought about replacing the front axle with an axle that i have that has manually locking hubs, but i'm curious about other avenues of approach. is there a way to modify/switchout the vacuum actuator with and electronic one? also, does anyone know how to manually get this type of front axle to engage and disengage? thanks