11" Backing plates rubbing

4mulas said

This was an excellent super informative post. Thank you.

In your opinion, do you think the 11.75” disc up front and either 11x2 or 2.5 on the rear would be well balanced on a 69 B body. Yes larger tires out back. Probably 275/60r15. And heavy big block torsion bars up front.

I only referenced torsion bars as another poster referenced 6 cyl torsion bars allowing his car to lock up and become out of balance. I’m still trying to figure out why that would happen to him and was thinking perhaps you may be able to shed some light on that. I normally wouldn’t think that torsion bars would cause changes in braking..?

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That’s a great combination. I run 11.75” disks and 11x2.5” drums on my ‘72 Challenger and have for like 70k miles of street driving with 275/40/17’s on all 4 corners. I was really happy with how balanced the braking was on that car. That was with 1.12” torsion bars up front and XHD springs out back.

The torsion bars absolutely make a difference. As brian6pac said it’s a weight transfer thing, the softer the front suspension is the more weight transfer to the front you’ll get when the nose dives under braking. The B/E bodies do have more anti dive built into the front suspension geometry, but it’s still a factor. Larger torsion bars up front mean less dive. That means less weight transfer forward and more braking from the rear brakes than the same car with smaller torsion bars. Weight balance, suspension, tire sizes and compounds all have an effect on the front/rear brake bias.