I have a few questions

[64shortbed]

Ok i have been thinking about doing the front disc brakes set up on my 1964 gmc. I have a complete front have of the frame from a 85 chevy silverado. I has the 1 1/4" rotors on it. My plan is to remove just the control arms and spindles and rebuild them with new bushing and ball joints. Then new calipers etc...

Now i have been looking at the 6 lug rotors from cpp. You can buy the pair for $130 + shipping. I called and they use the same bearings as the factory 5 lug rotors. A5 national inner bearings and A3 national outter bearings.

Now for you guys that have done the set up using the lower control arm and spindles from the 89-93, 94 3/4 ton 2 wheel drive pickups so you can buy your 6 lug rotors over the counter i have a question for you. From what I've looked up they also use the A5 and A3 national bearings.

So why cant i use the rotors from the 89-93,94 3/4 ton 2wheel drive on the 85 spindles? Or can you? Are the rotors differant diamiters?

If you know please let me know.

Other plans are to use all the 85 truck parts i can to upgrade to power steering and power brakes.
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[Captainfab]

That is true that the '88-'98 LD2500 6 lug rotors use the same A3 and A5 bearings. And while they will actually slide on the '71-'87 spindles, they will not quite line up with the calipers. I have physically done this myself.

If you want to use the '88-'98 LD2500 rotors, you will have to use the '88-'98 1500/LD2500 spindles as well as the other necessary parts outlined in the "Disc Brake Upgrade Reference Thread" that can be found in the '60-'66 FAQ Index.

[64shortbed]

Ok thank you. The reason i asked is because i did not find were it said as to why a person could not do these. And now that i know some one has tryed and it did not work then i will just continue with my original plan on just using the parts i have then order the 6 lug rotors later. Thank you for the answer you have helped me out a lot on this subject.

thanks again.