The Stovebolt Site Forums The Parking Lot Big Bolts Disc brakes for front axle.

It appears disc brakes for front axles are getting hard to find, at least in my part of the country.

I put P3500HD front and rear disc brake axles under my ‘37 GMC T-18 HD. In looking for disc brakes for my ‘55 GMC 373, I used a D-80 I had laying around for the rear. I found a Snap-On truck that was built on GMC P 3500 HD running gear, which, unfortunately I was unable to obtain.

However ‘91 to ‘01 Snap-On trucks like this would be another source like in the picture for adding disc brakes to an older GM front axle, tie rod behind the axle. I have another solution for 3500 HD (non P) front axle, tie rod in front of axle, when I have finished the job. Instead of making a steel bushing to adapt original king pin bushings to slightly larger P 3500 HD gear, I found a place in Detroit that makes bushings, for about $12.00 each I got new ones made to fit. GM changed grease fitting locations from side to end of king pins, so need to allow for proper lube, whichever locations one has.

I have never found a P-30 front axle, so have no info on that conversion.

Ed