Yes these rear disc brackets, as well as the other 2 for the 5x5 wheel stud pattern, will work with your '77 truck 12 bolt. The '64-'82 truck 12 bolts and the '80-'87 truck 10 bolts all have the same backing plate flange as well as the same brake offset.
Quote:
Originally Posted by Dobok
Hey Captainfab; I have a 94 Gmc ext.with the usual 10 bolt. We talked earlier(thro e-mails) and you told me that there is nothing yet fabbed for us (88-98) trucks. Well I am staring at my 1977 12 bolt rear diff. now and am guessing that this mod will now fit my new rear diff. setup once I install it !!! AmI correct now !!! I will be one happy guy if its true as I always wanted disca all way around on my truck !!! Thanks for responding and what are my choices if it does fit now !!! (Price too)
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