Posted By: EdPruss Disc brakes for front axle. - Fri Jun 04 2021 12:33 PM
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.


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Posted By: 9% grade Re: Disc brakes for front axle. - Wed Jun 09 2021 04:20 AM
Ed just so ya know thats a workhorse chassis shown in photo,and yes very common
Posted By: EdPruss Re: Disc brakes for front axle. - Thu Jun 10 2021 02:49 AM

Do you know of one for parts?


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