so far i have not broken the d44 .. thanks god cause i dont have enough for a d60 yet..have abother project i have to get on road first.... i have not really wheeled it on the rocks yet since im still doing so much to it but i was out at ocitillo wells doing some testing last weekend and it handled the stuff i threw at it with big block power .. im running right around 400 hp .. it handled the sand with 5psi in my tires and full throttle runs .. i started to climb up some big rocks but i was limited to what i can do since i need hydro assist to move the meats around while im flexing it out .. its defintaly not a big enough axle but its doing its job so far .. its got warn premiums ,detroit,x over .. i bought it from a guy that way and havent even had to open it up yet.. so maybe the axles are upgraded to?? if it aint broke dont fix it