Will later model ( say 77 or 79 ) wheel cylinders fit on my 1972 9" rear backing plates ?

Thanks for any help,

 

Everything I can find right off hand basically says all F100 rear wheel cylinders are the same from 60-74, maybe 75, then they change. I guess that would be a no.

 

If I may ask, "Why would you want to be doing that?" The internal size of the wheel cylinders is matched to the internal size of the master cylinder. Any other required variances are taken care of by the proportioning valve, etc. I would think you might upset the balance of things by doing such. Not sure what result you are trying to obtain. Certainly, it can't be cost as full retail on rebuilt wheel cylinders is only about $10 a piece.......for the right ones! So???

 

Thanks Ford_Six, I have a 66 F-100 with a 72 9" rear end.
I also have a 79 power disk setup and I wanted the correct rear wheel cyl.
Any advice?

 

If you are running a 72 rear end with 72 brakes, and are going to install the disc brake assemblies from a 79 on the front, then, you should be good to go. The 79 disc assemblies are the most used to accomplish this changeover. Be sure to get the proportioning valve from the 79 and install it also. No one I have heard from, including myself, have had any problems using this set up. I changed a 72 F-100 with a 9 inch rear end to disc front brakes and used the parts from a 79 donor truck. Everthing worked Great! You shouldn't have any trouble whatsoever with this setup. There isn't any reason to change anything on the rear brakes unless you want to install new shoes. The disc brakes on a 72 work with the standard drum or power drum rears fine. Enjoy having good brakes!

 

I went to a 75 front disk brake setup and master cylinder in my 72 F250, and left the 72 rear wheels cylinders with no problems. I think the difference is actually the wheel cylinder to shoe interface, IIRC the earlier trucks used a pin in between the shoe and wheel cylinder, and the later ones had the pin as part of the shoe web stamping. The diameters should be the same.

 

Thank you both,
That makes things easy.