Question

[MDFarms]

Good afternoon fellow GM Enthusiasts

I have a question, hope my explanation is clear enough below. My local parts store ordered me new rotors for my K10 Project a few months back. When I went to put them on today they slide about 1/2 way in and the outer part of hub is hitting the cast inside rotor. It appears that the rotor inside cutout is about 1/4 too small? Am I missing something obvious? Could be the rotors were stamped wrong? Not sure but has me wondering. Anyone tell me the outside diameter of the hub? Mine is mounted and I don’t have big enough calipers to measure. Anyone have a part number for rotors that will work?

The date stamps on axle housing and ring are late 1971 and it’s a Dana 44 front axle.

[68bowtie]

Humptey bumptey

[60case]

The rotors go on the inside of the hubs and the studs go through them into the hubs

[Richard]

Originally Posted by 60case

The rotors go on the inside of the hubs and the studs go through them into the hubs

On a K10 the hub is cast into the rotor. Most new rotors should have races for bearings already installed. Should only have to install the seal after rear bearing is installed. If rotor is hitting the knuckle/spindle something is not right. Did you install the bearing and seal on back side of rotor?

[72c20customcamper]

This is for my 85 yours should look similar the hub and rotor are serviced as one piece

[BASE]

I guess most all of my trucks have been K20's. Is that whole assy really cast as one piece? I know they tried to sell me the whole thing last year when I rebuilt my D44, but the rotor did come off by pressing out the studs.

[Richard]

The rotor pictured in post #5 is from a K20 (8 lug) Attached a pic of the rotor on the axle I removed from my 72 K10. The Rotors were the same on my 85 K10. Always sold as one piece afaik.

[BASE]

Ah, okay. Post #5 is what I have, except for I have the external hubs. Those come off pretty easy and I think they were the same rotors I used for the 14b rear axle disc brake conversion.

[72c20customcamper]

Originally Posted by Richard

The rotor pictured in post #5 is from a K20 (8 lug) Attached a pic of the rotor on the axle I removed from my 72 K10. The Rotors were the same on my 85 K10. Always sold as one piece afaik.

I just posted as I had it save . For reference as the rotor and hub are usually serviced as one unit wether it’s a 10 or 20

[kwmech]

I constantly get rotors separate all the time either 6 or 8 lug. Knock the studs out slide the rotor off and reverse the procedure. Not at all uncommon. As far as your fitment issue I would make sure the rotors match the ones that came off. May have gotten a wrong or mis-machined part

[Richard]

Originally Posted by kwmech

I constantly get rotors separate all the time either 6 or 8 lug. Knock the studs out slide the rotor off and reverse the procedure. Not at all uncommon. As far as your fitment issue I would make sure the rotors match the ones that came off. May have gotten a wrong or mis-machined part

Looking closely at my original 72 axle I think the rotor may come off the back side of hub. Never changed the rotors on the truck. Several brake/rotor changes on the 85 K10 and all came only with hubs. A current search reveals only the rotors available from sources for the 72. Apologize for any misinformation. Can take some measurements for OP this weekend if still wanted. The back mounted rotor is the main reason I did the 3500 Ram brake upgrade on my new Dana 60.