I installed the brake shoes backwards (primary shoe with less pad towards the rear of the vehicle). What is the worst case scenario if I leave the shoes installed this way? I would prefer not to swtich them.

 

Never tried that before, but my first impression is at the very least your shoe "life" is going to go south. IE - you will be changing them much sooner than you should. Other possibilities are that your fronts will wear a bit faster having to take up the slack of the mis-matched rears. Oh yea, and I wouldn't want to post the "worst case scenario".... if it came true I would feel bad.

 

I wouldn't even consider leaving them that way, fix it.