When we did the mechanical rebuild on Little Red a couple years ago, I installed a Quaife ATB limited slip. The car was factory equipped with a 4.56:1 gear set, which I kept. This required a spacer for the ring gear, which was readily available from Billy Bellinger. I contacted Quaife about oil, and they said that, while not necessary because the ATB is all gears and no clutches, the LSD additive increases lubricity and lowers temperature. I went with Redline 75W90 GL-5.
I used the same Redline 75W90 GL-5, which includes friction modifier, for my BTR cone type LSD axle. A lot easier than messing around with additives to old oil. It cured the clicking I got when maneovering on full lock with factory supplied oil. That was 25,000 miles ago. Recall having to buy another bottle as axle took more than volume quoted in handbook.
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