Re: laycock volvo overdrive oil
I have the "J" type in My Lancia Lambda (out of a Volvo)
In many cars with this overdrive installed, it shared the gearbox oil.
So this should indicate what type of oil they were originally intended to work with.
Also, if the overdrive is remote from the gearbox as in Most Model A installations, there should be some thought given to fitting a reservoir as the amount of oil contained solely by the overdrive is limited.
The gentleman who recently overhauled the overdrive suggested a 80-90 grade oil with a non slip additive?
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