It will soon be snowing here and I will be doing considerable more driving on the highways and expressways.

So, I have a 150 302 e4od 4x4 with the twin I-beam axle up front, I have looked the manual inside out, and have searched posts to no avail. I'm sure it has probably been discussed on here somewhere, but I could not find the post.

So if anyone knows what is the speed recomended for 4x4 safely on highways, I would appreciate it.