I have an 08 f150 supercrew king ranch diesel. I need to remove the bed to replace the bed rails. Any advice?

 

Hmm according to alldata.com the 2008 F-150 was only available with..
4.2 V6
4.6 V8
5.4 V8
All 3 Are gasoline engines !
What exactly are you replacing ?
You have me a little confused with your post.

 

I meant 250, it was late and I had a little buzz lol

 

Unfortunately, this is a 150 forum. To try and answer your question, are you referring to the bed rails/bed frame under the bed? Or are you referring to aftermarket rails that run the length of the top of the bed? If you mean the ones attached to the frame, all it takes is a few fasteners and you and a buddy should be able to lift it right of and weld in replacements.