I'm considering an upgrade from 10" to 11" rear drum brakes on my 1970 Challenger U-code R/T SE. The car came with factory front disc brakes along with both A36 and B41 on the fender tag for the 3.55 Performance Package and 10" rear drums.

Is the proportioning valve on the firewall the same for 10" and 11"?

Would the distribution block on the housing be the same or different?

Would the brake lines themselves be different?

This car was rode hard, put up wet, then was abandoned before being picked up and sold at a Detroit police auction. I purchased it in late '93 from the auction winner.

The bodywork is nearly finished so i'm readying the rear end assembly for cleanup and rebuild before the reinstall on this car that will see use as a long distance cruiser. On inspection there is a '741' center section instead of the correct '489' unit along with outward protruding lumps on the outside of the housing which leaked axle grease when turned bottom side down so i don't know if that can be repaired. Although i have neither the skills nor the tools to accomplish the repairs i'd definitely go that route if possible. I'm in uncharted territory here so all opinions are welcome.

Thanks in advance, Russ



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