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Valleyant
EFI Slant 6
Joined: 13 Jul 2007
Posts: 441
Location: Cincinnati
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Post subject:
10" rear drum brakes
(Mon Jun 06, 2011 9:10 am)
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| I have the chance to get rear 10" brakes off of a 1973 LBP 7 1/4 . Will these bolt/work on my Valiants 1972 SBP 7 1/4 rear end? I will get new SBP 10" drums but need to know about the backing plate etc. Thanks, nick
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Joshua Skinner
Supercharged
Joined: 27 Jan 2005
Posts: 6478
Location: Portland, Oregon
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Post subject:
(Mon Jun 06, 2011 10:44 am)
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| No, the big bolt pattern axle housing is narrower to accommodate the wider brakes. You need the whole axle assembly to change from small to big bolt pattern.
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Joshua Skinner
car nut, telecom tech, tool using mammal
'72 Dart Swinger
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Valleyant
EFI Slant 6
Joined: 13 Jul 2007
Posts: 441
Location: Cincinnati
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Post subject:
(Thu Jun 16, 2011 4:22 pm)
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| Ok, thanks Josh, I want to keep the small bolt pattern rear end for now and will concentrate on finding 10" drum brake package from a small bolt rear.
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Joshua Skinner
Supercharged
Joined: 27 Jan 2005
Posts: 6478
Location: Portland, Oregon
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Post subject:
(Thu Jun 16, 2011 5:13 pm)
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| Ah, looks like I misunderstood the original question. Yes, if you want 10" drum brakes on a small bolt pattern 7 1/4 they have to come from another small bolt pattern 7 1/4. I'd still try to find a complete axle assembly though.
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Joshua Skinner
car nut, telecom tech, tool using mammal
'72 Dart Swinger
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slantzilla
Board Sponsor & Moderator
Joined: 17 Oct 2002
Posts: 9415
Location: Park Forest, Illinoisy
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Post subject:
(Fri Jun 17, 2011 3:35 pm)
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The late BBP brakes have a completely different pattern on the backing plates. The SBP 7-1/4 brakes are 4 hole mount, the BBP are 5 hole. The BBP will also fit on an 8-3/4 or 8-1/4 though.
The BBP 7-1/4 got different housing ends, bearings, and axles. 
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Proud supporter of Mike Jeffrey Racing Engines since 1999.
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Ed Mullen
EFI Slant 6
Joined: 18 Jun 2008
Posts: 276
Location: Highland Park, NJ
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Post subject:
(Tue Feb 07, 2012 9:02 pm)
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| Quote: | | if you want 10" drum brakes on a small bolt pattern 7 1/4 they have to come from another small bolt pattern 7 1/4 |
Thats not good. I stupidly assumed I could get backing plates from an 80's D50 or B150, bolt to my 7-1/4" rear' and install all new 10" drum brake stuff. (similarly, I was kicking myself for having thrown away my van's rear brakes when I had swapped rears, upgrading brakes in the process.)
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87 B150 /6
70 Valiant 4 door 225
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WagonsRcool
EFI Slant 6
Joined: 02 Apr 2011
Posts: 343
Location: New Jersey USA
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Post subject:
(Fri Feb 10, 2012 11:47 am)
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| I only recall seeing 10" rear drums on A-bodies that had disc brakes. (My 10" drum cars still had 9" rear drums.) They seemed fairly "common" on '73-up LBP 7 1/4 rears, but I can't say that I've ever seen a SBP disc car with 7 1/4 axle ( always 8 3/4 rear with those silly skinny 10" shoes )
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63 Valiant Wagon
225 - 4 bbl
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Joshua Skinner
Supercharged
Joined: 27 Jan 2005
Posts: 6478
Location: Portland, Oregon
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Post subject:
(Fri Feb 10, 2012 12:27 pm)
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I see we've revived a dead thread. I'll pump some more life into it now.
Had a disc brake '72 Duster with 10" rear drums on the 7 1/4" axle. Those drums had large bells. I imagine for improved cooling. My '66 Barracuda had 10" drums front and rear. Also with a 7 1/4" rear axle.
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Joshua Skinner
car nut, telecom tech, tool using mammal
'72 Dart Swinger
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Ed Mullen
EFI Slant 6
Joined: 18 Jun 2008
Posts: 276
Location: Highland Park, NJ
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Post subject:
(Tue Feb 14, 2012 9:39 am)
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| Anybody know a Dorman or Mopar # for the 10" backing plate for SBP 7-1/4" rear?
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87 B150 /6
70 Valiant 4 door 225
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Doc
Guru
Joined: 14 Oct 2002
Posts: 5004
Location: Working in Silicon Valley, USA
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Post subject:
(Tue Feb 14, 2012 10:31 am)
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I have a number of good used 64-72 SBP 10 rear backing plates for the 7 1/4. (4 retaining holes)
Send me a PM.
DD
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