briwill70
Well-Known Member
I've got a 65 Dart that has a post '73 7.25 rear end. I found a 8.25 rear axle from a 72 scamp that has a better rear gear ratio. How hard is it to convert that to the big bolt pattern? Is it hard to find axles?
Change 8.25 rear axle to big bolt pattern
- Thread starter briwill70
- Start date
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The 8.25 should already have the big bolt pattern axles
Yes if it is a 8.25, it will be BBP.
No 8.25 rears until 1973. 8.75 in 1972, so this axle (which would be SBP). Now if this is a whole 8 3/4 rear and and you swap it for the 7.25, that would be worth your while... there are several sources for big bolt axles for 8 3/4 rear ends. Would it come with the brakes shock plates, brackets? All different from 7.25 to 8.75, and you would get better rear brakes to boot if you made this swap.
McMopar1
New Member
What are the sources?
33IMP
Well-Known Member
An 8 3/4 would be a dropout center section, an 8 1/4 has a bolt-on rear cover. First thing to do is decide what you are looking at. (An a-body 8 3/4 is worth three times what an 8 1/4 is worth).
volunteer
Well-Known Member
So what are the primary options to 'upgrade' (8.75) to BBP? I can think of redrilling original flanges or - aftermarket axles. Pros and cons to each of these? Sources or suppliers? Costs? 
Yukon are great for a typical high performance street cars. Moser are the best but more expensive. Build for your dream engine if you are going to keep this car around, it's most expensive if you buy them twice...
Dr Diff has what you need (after you figure out what you have)
briwill70
Well-Known Member
It was a 8.25 with sbp but it sold. The search continues.
No such thing as a factory 8 1/4” with SBP.
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