>
>Tell you what, Graham, you run 90 weight in your tranny for a year and
>tell us what happens. That should resolve the dispute.
>
I'm aware of the differences of opinion on the net regarding this (how could
I not?). Well recognized lbc specialists such as John Twist insist upon
avoiding 80/90W. Some experienced owners, such as A.B., do too. At the
same time, I can point to other experienced lbc specialists and owners who
say the opposite. Experts aside, annecdotal evidence is not the strongest.
I wonder if for every destroyed tranny attributed to the use of 80/90W,
someone couldn't find a strong runner of tens of thousands of miles
attributed to 80/90W. The evidence to convict would seem inconclusive.
What I can add to the discussion is (sadly, more anecdotal evidence): I have
talked to a few local lbc mechanics regarding the issue of 80/90W gear lube
vrs. 30W engine oil in the tranny (I've talked to Twist, too). Both of the
mechanics I've spoken to on this issue have ample (20+ yrs) experience with
lbcs and trannys and both use 80/90W oil in their own cars as well as
customer cars (i.e. cars they put their labor guarantee on). Moreover: both
have *over* 70,000 miles on their own lbc trannys using 80/90W oil (one an
MGB box, the other a Triumph). They don't object to using 30W, they just
happen to use the 80/90W.
On that recommendation I put it in my '63 B (these guys have never steered
me wrong. Who knows, this might be the first time). Granted, its only been
a year (sic) for my car, but I have NO problems with bearing noise, slowness
of shifting, loss of synchro function or any other problem. I also use
80/90W in the diff.
Will Zehring
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