Not a Firebird, but have a new Strange Engineering Dana 60 in my '67 GTO street car. Quoted as 60 pounds heavier that their Ford 9", but the trade-off for the 9.75" ring gear and extra beef is worth it. I've seen two Ford rearends spit the pinion out and that was part of the reason for going the 60 route.
I purchased mine this time last year because of their big sale, and I received an email a few days ago saying that their yearend sale is again on.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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