will this work on our 5.0s?

with the pedal to the floor its WOT... isn't that the way it should be?? ... just take the air tube off the throttle body and have someone floor it (with the car not running, of course) should be wide open

Throttle cables can stretch and just get worn out over time. If you put the pedal on the floor and it isn't at WOT, then get a cable.

You could cut out the floor pan and lower it so the pedal goes down furter making the car faster, I'm just being a smartass.

I can see a throttle cable wearing out, but not stretching, at least not with the small force applied by the throttle return. Anyway, I agree with making sure you actually have a problem before trying to fix one. Mine opens all the way even with a 177k original cable.

On a side note, I know of an '01 V6 manual Mustang that wasnt a slouch. It was a coworker's wife's showroom stock car. He took it to the drags with only 3000 miles on it and ran it like he meant it down to a 14.6. Thats 5.0 territory.

just tug on the darn cable fron the throttle body and if it opens 100% then your good.......

Theres a link in here... http://mywebpages.comcast.net/jfclague/Mustang_Mods.htm
Click on 'Accelerator Pedal'