I have a 1965 Dart with a Slant 6. I have found an 8 1/4 rear differential that I would like to put in and get rid of the stock (whinny)
7 1/4. Will the 8 1/4 fit? Do the drum break backing plates match up and bolt onto the 8 1/4? Any help and input would be appreciated. Thank you in advance.

Depends on what model vehicle the 8 1/4 was in No the 7 1/4 rear barkes will not swap over. The 8 1/4 will be large bolt pattern where the 7 1/4 was small bolt pattern.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Thank you Charrlie.

what vehicle was the 8 1/4" axle originally from? That will be the big factor here.

realistically only A or F/J/M Bodied donor cars axles will work, but with the flat rear wheel arch openings the F/J/M Axle will require a high positive offset / nonstock wheel.

I run a '69 Road Runner in my '64 Dart - it's is a bit too wide - I will be switching it to a '67 Satellite Rear axle someday.

Good luck,

Greg

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http://www.youtube.com/hyperpack

I installed an 8 1/4 assembly in my 1972 Valiant. Not sure what it came out of. It's a bit wider.