I found the Austin 7 book I was thinking of but alas no reference. It will occure to me at some point where I got the tip from...
Just had a little google and came up with this link from which I've pulled two quotes out below:-
http://www.film.queensu.ca/cj3b/Tech/Lube.htmlDavid
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"The consensus, as expressed on many Jeep mailing lists, seems to be that whatever lubricant the manufacturer referred to in the early manuals, it is no longer available. The reference to 140 wt gear oil is interesting, as it seems to be a later one. 'Knuckle pudding' is a concoction many are using -- a 50/50 mixture of bearing grease and 90wt gear oil. (The 'pudding' comes from the fact that to make this stuff, one has to slowly heat the gear oil, while stirring in the grease.)"
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"I have run 90 wt gear oil in mine for years (and years). I think Willys put plugs where gear oil goes and grease fittings where grease goes. The only exception I've made to this is the steering box and it is for the same reason I have reservations about pure grease in the knuckles. When it has room to do so, grease pushes away from the moving parts and tends to stay there, not having the viscosity of oil. Of course it lubricates some, but the parts are not in a "bath" as I think the knuckles were intended to be. Reed's 'pudding' is probably the best compromise if you have leaks you can't deal with right now. Butre-sealing these knuckles is fairly easy and inexpensive. I replaced mine near six years ago and have no leaks as of yet."