Does anyone know of a rear 11" (with 5 0n 5.5 bp) backing plate that's pretty flat like the Lockheed (zero or very little offset) or close that is setup for the new large bearing "Torino style" flange. If there's nothing what rear drums have close to a zero offset and maybe I can re drill. On the banjo the spring hanger is right at the backing plate and I'm thinking about some Bendix style brakes since the fronts are going to be F100.
The problem with Ford brakes after the mid 50's is that for the same basic car or truck they can have three or four brake shoe combinations on a nine inch rear axle. Some Mid 60's trucks had 11 x 2 or so rear brakes with pretty flat backing plates and fairly flat drums. They may be off small bearing rear ends though.
I cut out a deeply recessed center and made my own flat center and welded it onto an existing plate for my avatar.
What is your measurement between the axle flange and the spring hangar? Does the backing plate need to be dead-flat?
I'm just thinking out loud, no real measurements yet. I was thinking of something like a F100 rear (11x1.75) would be a low offset. Exploring an idea for a different rear set up or at least just brakes. Here's the spring perches with a banjo rear and lockheed brakes.
Going from Lockheed to Bendix brakes with a top spring brings another wrinkle. With Lockheed brakes the wheel cylinder is near the edge of the backing plate. With Bendix brakes the anchor pin is there, and the wheel cylinder is underneath it. That makes the clearance issue with the spring hanger worse.
I was thinking of the anchor bolt also, from what I've been reading the T spring VS A spring length difference is about 1" (T being shorter). I could move the perches in a 1/2" and see if I still need to go further with a shorter main or modify the backing plates (which I would need to stay with in the confides of regular drum/shoe width). https://www.jalopyjournal.com/forum/threads/model-a-or-t-spring.202600/#post-2179943 I wasn't sure when the all bearing switch happened. So any smaller width shoes (under 2") wouldn't be a later "Torino" style big bearing.
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