One other other thing is that the additives used in some gear oil (and
aftermarket stuff like Slick-50) are incompatable with Laycock
overdrives.
Hmm. John, how do you then explain that Triumph specifies gear oil for
their gearboxes, including Laycock overdrives?
What *I* have come to understand is that the big difference in gear
oils is whether or not it has the EP (extreme pressure) additives.
These are high in sulfur and attack the brass synchros, so it's
important to put a non-EP oil into the gearbox. I've been very happy
with Chevron Delo Lube (which I buy in 5 gallon buckets) in both my
Laycock gearboxes and differentials (one of which has a Quaife limited
slip, but that's too new to report long term results).
RedLine; their engineers seem to actually know what a
Laycock overdrive is, at least...).
This is new, although I haven't talked to them for a couple of years.
Are you actually using a RedLine product in a Laycock box? Which one?
I'd love to hear about it, since the GT6 still has a problem with the
overdrive hydraulic pressure going away when it gets very warm.
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