Jim :
My understanding is that Triumph changed their recommendation sometime
around 1960.
The original TR2/3 factory manuals definitely specified engine oil,
either 20, 30 or 50 weight depending on climate. There is even a
warning against using "hypoid gear oil" in cars fitted with OD, both in
the driver's manual and in the OD service manual.
However, there was a later factory publication covering TR 2/3/4 that
specified GL4 gear oil, even for cars with OD. According to an article
published by Ken Gillanders, he spoke with a "factory contact" who
confirmed that the recommendation had been changed, due to premature
gearbox wear on some units.
So, "you pays yer money and yer takes yer cherse". Personally, I use
Valvoline 20W50 Racing oil in my A-type OD tranny (on Ken's
recommendation), and I'm quite happy with it.
Randall
59 TR3A TS39781LO daily driver
Lakewood, CA
PS We might as well dive into this topic again, it sure beats trashing
TRF or Ken Shapiro. <g>
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