hi guys i have a sierra p100 im converting to a 4x4 2.8 i have all the running gear minus the rear lsd diff and they seem to be quite pricey. ive been told i can use a standard 3.62 diff and weld the planet gears together to get constant drive on both rear axles is this ok to do and will it be road legal and how reliable any help would be much apreciated cheers