ol'skool Posted July 22, 2014 Report Share Posted July 22, 2014 Have a 41 Plymouth with 4 hole spindle. I'm in the process of disassembly for king pins. I want to install disc brakes. I have a conversion from Rusty Hope but it's for the 3 hole spindle. Can the 3 hole spindles be used on the earlier cars that used a 4 hole? I'm not finding anything saying either way. Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted July 22, 2014 Report Share Posted July 22, 2014 Did you contact Rusty Hope? Quote Link to comment Share on other sites More sharing options...
ol'skool Posted July 22, 2014 Author Report Share Posted July 22, 2014 No I didn't. I figured it would be quicker to ask on this forum. The knuckles are the same so I don't know why I can't use the spindles. King pins are the same, etc. The 3 hole spindles are from a 1948. The part numbers one the knuckles are the same so I don't know why. I'm asking if others have swapped before. Save time and money with shipping. Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted July 22, 2014 Report Share Posted July 22, 2014 I understand. Much better and quicker to ask the question here as opposed to making a phone call to the source who has the correct answer. 1 Quote Link to comment Share on other sites More sharing options...
Eneto-55 Posted July 22, 2014 Report Share Posted July 22, 2014 I can understand asking here. It is actually a parts interchangeability question, not really a question regarding the application of the custom "after-market" parts. Unfortunately, it appears that no one here knows, or that person has not yet seen your post. I do know that front-end parts from the 53 models will fit on the P15s, because that is something I have done. (Sorry I can also not answer the question. I am assuming that you do not have the later model parts to just try it with.) Neto Quote Link to comment Share on other sites More sharing options...
ol'skool Posted July 22, 2014 Author Report Share Posted July 22, 2014 I don't have his phone number. Only email. So, Don, if you have his phone number, please send it my way! Quote Link to comment Share on other sites More sharing options...
james curl Posted July 22, 2014 Report Share Posted July 22, 2014 No the earlier models used the same backing plate, four holes as the pick ups do unlike the 46 through 56 cars which used the three hole backing plates. The front suspension is the same through 56 except they put the shock inside the front springs. If someone has a 56 and could locate the top shock mounting hole then anyone could drill the correct size hole in the upper arm mounting box and use a 56 shock. My Motors manual shows the front brakes to be the same until 59 when they went to torsion bar suspension. Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted July 22, 2014 Report Share Posted July 22, 2014 call Fatman..they basically either resold Ply-do stuff or vice versa...Ply-do is defunct...Fatman is not surely so they have the answers.. Quote Link to comment Share on other sites More sharing options...
Solution Andydodge Posted July 22, 2014 Solution Report Share Posted July 22, 2014 YES you can.....I have a 1940 spindle on my 1940 Dodge with 1941-56 stub axles that have the 3 holes(actually from an Oz 1962 Chrysler Royal which was a 1954 Plymouth with 55 Plymouth fenders etc....but I digress....lol) .......I am running disc brake and this setup has been on my car since about 1976.........you can't use the 1940 brakes backing plate on the 1941-56 spindle tho'..........anyway see the attached pic..................andyd Quote Link to comment Share on other sites More sharing options...
David Strieb Posted July 23, 2014 Report Share Posted July 23, 2014 If you mean will the P15 era spindle will fit the P11, P12, yes they are a direct fit. I ran the dual wheel cly front brakes on my P10 before it got a fatman sub frame and a pinto / mustang ll suspension. The P15 spindles will also fit my '38 dodge pickup, but the '38 steering arms won't match the P15 spindle. Hope this helps. David Quote Link to comment Share on other sites More sharing options...
james curl Posted July 23, 2014 Report Share Posted July 23, 2014 (edited) I misread the original question as can you use Old Daddy's disc brake adapter plates for the later spindles which have three holes on a four bolt hole spindle. Yes you can change the spindle to a later year spindle as they all use basically the same up right that the spindle installs on. If I had read the title of the thread I would have known that he was asking if the three hole spindle would fit the earlier uprights. Just goes to show that you need to read what the subject is about before you answer. Edited July 23, 2014 by james curl Quote Link to comment Share on other sites More sharing options...
ol'skool Posted July 23, 2014 Author Report Share Posted July 23, 2014 Thanks for the replies. I didn't see why they would work so I am having the 3 hole spindles fitted with new bushings for king pins. I will use the conversion kit I have here. Glad I didn't have to exchange or return it. Saves a little money and time! Quote Link to comment Share on other sites More sharing options...
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