Okay, here's my report. I drained the Hypoid 80/90 from both the gearbox and
the O/D, and replaced it with straight Valvoline 50w racing oil, supplied by
my transmission man. It took several seconds for the oil to work into the O/D
channels, but then it kicked in nice and solid. No more slippage under
acceleration. I haven't been on the freeway yet to really give it a good
workover, but the switch to the lighter viscosity gearbox oil seems to have
done the trick. At least, that's my preliminary assessment. I also notice
smoother shifting in the gearbox. I wouldn't have thought I'd feel much
difference there, but I do and I like the change.
Take care,
Jeff in San Diego
1968 Spitfire Mk3 aka "Mrs. Jones"
Back on the road 3/17/03...
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----- Original Message -----
From: ptegler@cablespeed
To: Jeff McNeal ; Mike Chmura
Cc: spitfires@autox.team.net
Sent: Wednesday, April 02, 2003 10:16 AM
Subject: Re: Funky D-type O/D, P. II
It's amazing the diversifications of opinions,
btdt's, spec sheet conflicts, etc etc
...as an example, the D type O/D is the same
on the MG as the early (read same model years)
and the Triumphs. MG spec'ed straight non-d
30wt motor oil while Triumph spec'ed 80-90wt hyd.
I use... 30 in my MG and Castrol 90 in my Triumph.
both (all thee) O/D's run fine and have never given me
a problem. Triumph did, in it's later days, suggest
30 was better. I've always used what was in the
oem handbooks for that year.
The real concern here is the additives in both (or
lack there of) and how they effect the brass and
copper parts and seals rubber used by the mfr.
Paul Tegler
ptegler@cablespeed.com
www.teglerizer.com
----- Original Message -----
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