Well, I am replacing my front hubs because the passenger side has failed. But Looking up the part it asked if I have 2 wheel abs or four wheel abs. I know I have abs in front but what about the rear. All I see is my sensor on the rear end

 

All Super Duties have rear ABS. The difference is some don't have the front ABS. The VSS sensor on top of the rear axle housing is part of the rear ABS.

 

how do you tell if you have 4 wheel abs? I'd like to know too because my abs acts more like power brakes, meaning when it breaks loose the pedal gets a little more squishy and goes down a bit more and the wheels don't lock up but instead the truck brakes hard enough to stop but without breaking traction on concrete.

 

Look for a bundle of three heading down towards your hub.. 1 will be the brake line, 1 will be the vacuum line, the last is the electrical for the anti lock brake system.

 

Well then mine will have 2 because I don't have auto hubs (Thank god!). Thanks for that info, I'll look at it and thanks for the post, this is good FYI.

 

Caption says it all.
I don't have vacuum hubs.
You can see the lead going into the hub for the ABS sensor.