How much differential lock?

Peter, the 40% locker is the most common with two friction discs per side. The 70% locker has three discs per side and depending on how the suspension is set up, it can cause understeer. Can be corrected with proper anti-sway bars, but the friction from a 70% locker also causes more heating of the ZF lube. So if you invest in a 70% and running the 'Ring in your Pantera's future, consider investing in a diff cooler. With a 40%, just driving 400 miles on superhighways at speeds of 120mph or less warms the lube in my car to no more than 180 degrees F. Higher avg speeds causes more heating.

Thats why when pro racers ran Panteras in the 70s & 80s, they used the earlier ZF sprag-lock diff from the GT-40 (and a few Mangustas & early Panteras). But those wear rapidly and I'm told there are no more ZF spare parts for these diffs. You have to make them yourself. And even then, some racers used diff coolers.
In the 5DS- 25/dash-zero and -dash-1 ZF manual (which is mostly a picture book, not a real overhaul manual), there's some illustrations. The diff case that also holds the ring gear inside looks different than the later one with friction discs, as only one end is removable rather than both ends unbolting.

But as I said, the tilting sprags (they look a little like steel beans) begin to wear instantly upon running the car and after a time, they no longer tilt correctly and provide locking. And there are practically no spares- the GT-40 guys all snatched them up. Indeed, most GT-40s today run the later clutch type LSD just because of no availability of the sprags and other parts.

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