51_Meadowbrook Posted September 16, 2022 Report Share Posted September 16, 2022 I don’t have an interchange book and it’s leading to my downfall. I thought I was just adjusting the brakes but I saw the front shoes full of brake fluid. So I took the front drums off and decided to have them turned. Since I was doing the front cylinders I decided to go to the back and rebuild them. I took the rear drums off and brought all four to get turned. The guy said did the front drums and said I need new bearings and races but wouldn’t do the rear. He said they were so out of round he couldn’t get them to come back. So now I’m stuck with $450 per drum unless I can find some used drums. My issue is I don’t know which cars used 11” drums with the hub attached to it. They are 11x2.25. It’s my understanding that Plymouth had this type but used 10” drums. Any ideas on which cars used that style brake drums and where I might find some used ones? Quote Link to comment Share on other sites More sharing options...
Frank Gooz Posted September 16, 2022 Report Share Posted September 16, 2022 Looking in my 1954 and prior parts book shows 1949 - 1952 being the same parts numbers. 1316 714 right side and 1316 715 left side. Passenger cars. I do not have a parts book for trucks yet. Maybe the same part numbers in the same vintage or years. Good luck. Quote Link to comment Share on other sites More sharing options...
Sniper Posted September 16, 2022 Report Share Posted September 16, 2022 My 51 Plymouth does not use a one piece hub and drum setup, front or rear. Quote Link to comment Share on other sites More sharing options...
capt den Posted September 16, 2022 Report Share Posted September 16, 2022 there are many junkyards t5hat have alot of old mopars. not sure what they would charge for a drum, but call to find out. you will still have to pay shipping and maybe turning, so the 450 for a new one may not be out of line.try browns in texas, 940 393 2469. t5here are many more. capt den Quote Link to comment Share on other sites More sharing options...
Los_Control Posted September 16, 2022 Report Share Posted September 16, 2022 My first project was a 1949 B1C 3/4 ton truck. It had 11" drums while 1/2 ton have 10" If you use Facebook, there is a group https://www.facebook.com/groups/pilothouse Douglas Crozier is a member there and he has been buying trucks & selling parts for some time now .... just possible he may have them. No idea if they would work on your car .... I just assume mopar kept things simple & 11" drums would be the same between the car & trucks ... same with 10" Good luck in your search. Quote Link to comment Share on other sites More sharing options...
kencombs Posted September 16, 2022 Report Share Posted September 16, 2022 9 hours ago, Sniper said: My 51 Plymouth does not use a one piece hub and drum setup, front or rear. Not one piece but riveted together?? Quote Link to comment Share on other sites More sharing options...
51_Meadowbrook Posted September 17, 2022 Author Report Share Posted September 17, 2022 16 hours ago, Frank Gooz said: Looking in my 1954 and prior parts book shows 1949 - 1952 being the same parts numbers. 1316 714 right side and 1316 715 left side. Passenger cars. I do not have a parts book for trucks yet. Maybe the same part numbers in the same vintage or years. Good luck. Why are the left and right different part numbers? Wouldn’t they be the same drum? What’s different about them? Quote Link to comment Share on other sites More sharing options...
51_Meadowbrook Posted September 17, 2022 Author Report Share Posted September 17, 2022 The ones I took off are riveted as well. I thought about removing the rivets and attaching a new standard 11” drum on it but the drum turned said he wasn’t sure they would sit right since the original drums are recessed from the riveted section. Quote Link to comment Share on other sites More sharing options...
51_Meadowbrook Posted September 17, 2022 Author Report Share Posted September 17, 2022 Upon closer look it looks like it might just be held together by the studs. Quote Link to comment Share on other sites More sharing options...
51_Meadowbrook Posted September 17, 2022 Author Report Share Posted September 17, 2022 Quote Link to comment Share on other sites More sharing options...
51_Meadowbrook Posted September 17, 2022 Author Report Share Posted September 17, 2022 Quote Link to comment Share on other sites More sharing options...
Sniper Posted September 17, 2022 Report Share Posted September 17, 2022 3 hours ago, kencombs said: Not one piece but riveted together?? Yes Quote Link to comment Share on other sites More sharing options...
Sniper Posted September 17, 2022 Report Share Posted September 17, 2022 1 hour ago, 51_Meadowbrook said: Why are the left and right different part numbers? Wouldn’t they be the same drum? What’s different about them? Left hand thread lug bolts and right hand thread lug bolts Quote Link to comment Share on other sites More sharing options...
51_Meadowbrook Posted September 17, 2022 Author Report Share Posted September 17, 2022 Oh I didn’t even think of the threads. The drums and hubs are identical though, correct? Quote Link to comment Share on other sites More sharing options...
Doug&Deb Posted September 17, 2022 Report Share Posted September 17, 2022 They should be but I’m not certain. I feel your pain. I did a disc brake conversion because it was less expensive than a decent drum. Dodge was the only Mopar with studs and nuts. Try Moore’s. They’re a Mopar specific salvage yard. Quote Link to comment Share on other sites More sharing options...
Frank Gooz Posted September 17, 2022 Report Share Posted September 17, 2022 Good morning, Mopar also used 11 x 21/2 brakes later. My 1970 charger has them on the rear end. Could you adapt? Quote Link to comment Share on other sites More sharing options...
Sniper Posted September 17, 2022 Report Share Posted September 17, 2022 4 minutes ago, Frank Gooz said: Good morning, Mopar also used 11 x 21/2 brakes later. My 1970 charger has them on the rear end. Could you adapt? I've wondered about the 10" drums on my 51, lots of later Mopar have used 10" drums too. What I really need to do is pull my drums, measure them out and see how they match up to the dimensions I see online for the later drums, then buy a cheap one for fitment checks if it looks like it'll work. Quote Link to comment Share on other sites More sharing options...
Frank Gooz Posted September 17, 2022 Report Share Posted September 17, 2022 I have not checked any dimensions but i have some rear drum that are 11 x 2 1/2 and 10 x 2 1/2. Is there anyone that has taken the hub off an old drum? The face thickness may be of concern also by look at the pictures the overall depth. I will try to measure the drums i have later today and post them for comparing. Quote Link to comment Share on other sites More sharing options...
Frank Gooz Posted September 17, 2022 Report Share Posted September 17, 2022 I did not mention that the part numbers i gave earlier were for six-cylinder cars only. Quote Link to comment Share on other sites More sharing options...
nonstop Posted September 17, 2022 Report Share Posted September 17, 2022 (edited) I have done a whole conversion, adapting 10x2 1/2 rear Bendix brakes to the original rear end and it works well, but I have not tried using just the drum with the current Lockheed set up. Edited September 17, 2022 by nonstop Quote Link to comment Share on other sites More sharing options...
andyd Posted September 18, 2022 Report Share Posted September 18, 2022 I have an Auto Interchange Systems 1950-65 Chrysler Products Interchange Manual dated 1979.....for Dodge rear hub or rear drum & hub it lists 1949-1955 6 cylinder (not Station Wagon or V8 models)........dunno if this helps........andyd. Quote Link to comment Share on other sites More sharing options...
Frank Gooz Posted September 18, 2022 Report Share Posted September 18, 2022 Here are the dimensions for the brake drums i have. Mopar 11 x 2 1/2 4.480 overall height. this can be shortened by a lip that is .620 long. The outside diameter is 13 5/8. The thickness of the face is .105. the flat face on the inside mates to the axel face about 6 1/8. Center hole is 2.840 and the stud holes are already.655 Mopar 10 x 2 1/2 3.680 overall height. The outside diameter is 11 9/16. The thickness of the face is .100. The flat face that mates to the axel face is the same as above 6 1/8. The center hole is the same at 2.840 and the stud holes are already .655. Hope this helps. Good luck Quote Link to comment Share on other sites More sharing options...
51_Meadowbrook Posted September 20, 2022 Author Report Share Posted September 20, 2022 Removing the studs revealed two pieces. Can I use a standard drum and the wheel studs into this hub or will the new drum be too shallow due to the indentations the older drum had which seem to push the drum back further? Do not use this picture as reference to the indentation, use the original one. Since I didn’t care about this drum since it couldn’t be turned I did not make sure to keep its structural shape when I was removing the studs. Quote Link to comment Share on other sites More sharing options...
Sniper Posted September 20, 2022 Report Share Posted September 20, 2022 I had an 87 Diplomat, upgraded to cop spec 11" rear drums, they look close on dimensions. Remember, use the cop/taxi drums for comparison. https://www.rockauto.com/en/catalog/dodge,1987,diplomat,5.2l+318cid+v8,1090820,brake+&+wheel+hub,drum,1744 Quote Link to comment Share on other sites More sharing options...
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