10" drum brake swap for BP change

dartnfish said

did the 10 x 2 and the 10 x 2.5 use the same backing plate? if so you would think a guy could use 2.5" shoes and hardware then get a 10 x 2.5 drum with the bbp (as you already have) and bolt everything up using the axles set up for the b-body offset. it all boils down to the offset of the baking plates.

Click to expand...

No, the 10x2 and 10x2.5" do not use the same backing plate.

All BBP axles use the same axle flange offset (and that offset is different than SBP axles). That means the wheel mounting surface is in the same place for all of them, regardless of the brake width. Which means that the backing plates must be matched to the drums. If you have 10x2.5" drums, you need 10x2.5" backing plates. If you have 11x2.5" drums, you need 11x2.5" backing plates. Same for 11x2" drums, 11x3" drums, etc.

By doing it that way you can use the same axles for all of the different BBP brake combinations. If the backing plates were all the same, the axles would have to be different for each of the different brake drum widths.