I have a 87 F150. 4.9 with a 4 speed.
My clutch has started slipping in 3rd and 4th, so being pretty sure that there is no adjustment on the clutch, I'm planning to replace it.

Problem is, I start looking at parts and see that there are 2 different clutches, an 11" and a 10". Due to this being my daily driver, I can't take the clutch out and then order it.

How do I know which one to get without taking the clutch out?

Thanks,
Gary

 

Doesn't matter. Buy the 11" set. The flywheel is drilled & tapped for both, and the 10" wasn't used much after ~'82. This is probably the same set you need:



Read this caption & the NEXT 4.

 

Thanks Steve. Thought they might both fit, but wasn't sure.