I currently have a 98 Ram 2 wheel drive with 391 posi, this truck has reached the end of its life and I would like to swap the 391 rear axle housing into a 99 Ram with 355 rear gear. Will the speed sensor on the axle housing tell the computer what it needs to know for the speedometer to read correct or is there something else I need to do? I'd appreciate any input on this, thanks.