8-3/4 diff with 4x5 stud bolt pattern

[Leeroy]

Hey guys , doing the brakes on the 75 Duster . Ordered parts and as per usual you never end up with what you thought you bought.
Turns out the diff has been changed out , I have 5 x 4-1/4 on the fronts so the new disc fit the wheels . Rear is a different thing . Ended up with drums and shoes too wide and a stud pattern larger than what's on the car.
The rears are 5 x 4 , what years did the A body 8-3/4 have smaller stud bolt pattern?

 

[NC Engine Builder]

All stock a body 8 3/4s are small bolt pattern

 

[daredevil]

sounds like have the 4.5 bolt circle 73 and up n front and the 4 1/4 inch 72 and down in the rear. Abodies had 1.5 inch pads so if you have wider pads someome mismatched backing plates and drums from original.

 

[Leeroy]

So looks like the diff has been changed out , thanks guys.
Now I need to find out if the axles I can get with 5x4-1/4 hubs will fit this diff.?
Would like to eventually end up with the same bolt pattern front and rear.

 

[forphorty]

Contact Dr Diff. He can set you up with 4.5 bc (bolt circle) axles that use common B body brake drums , shoes and backing plates. The brakes off of a A or B body 8.25 rear will also work.

 

[forphorty]

http://www.doctordiff.com/

 

[Marcohotrod]

check the vin, 5th digit, 6 cylinder cars had the 5 on 4", starting around 1973 the 8 3/4 was not available in a bodies and v8 cars had 5 on 4.5"

 

[AJ/FormS]

And there was never a 4.25 on any A-body. Period. Or vintage Mopar for that matter.

 

[Leeroy]

My apologies gentlemen , I referred to 5 x 4.25 when I should have been talking about 5 x 4.5 on the front of this car.
Front brakes went on no problem , rears today after getting proper shoes and cylinders late yesterday.