In my TR4 (which I've owned since 1974) I originally used 20/50 engine oil in the overdrive gearbox. Apparently ordinary multigrade engine oil can froth (detergent?) so people seem to use either a straight 40 oil (Penrite do one for gearboxes), or EP90 GL4 spec gear oil which is what I now use.

But in my LT77 I'm sure that I use ATF?


Malcolm T
1966 +4
1957 TR3
1963 TR4
1983 LR 110
1985 Robin Hood 2.0l