I've had the Healey 1.28:1 ratio and the TR A-type apart and they appear
identical in every way with the exception of the accumulator piston which was
full dimension on the TR and sleeved down on the Healey. All materials the
same all internal parts the same and the TR ran well on GL4 (per the service
manual) as long as I had it. The Bentley manual for the TR6 shows GL4 as the
recommended lube. If there was a change near the beginning of production it
seems like it would have made it into the manual at some point...
Bill Lawrence
> Date: Sat, 14 Nov 2009 19:56:28 -0800
> From: sjnnock@sbcglobal.net
> To: healeys@autox.team.net
> Subject: Re: [Healeys] Dave Dougan's overdrive part 2
>
> TR6 overdrive is not the same as Austin Healey , oil for all British car
trans, is as per the manufacture, see your owners manual .. Norman Nock
>
> --- On Sat, 11/14/09, WILLIAM B LAWRENCE <ynotink@msn.com> wrote:
>
> From: WILLIAM B LAWRENCE <ynotink@msn.com>
> Subject: Re: [Healeys] Dave Dougan's overdrive part 2
> To: coudesluijs@chello.nl, lapierrem@sbcglobal.net
> Cc: healeys@autox.team.net
> Date: Saturday, November 14, 2009, 6:36 PM
>
> You can use heavier oils in the overdrive. As a matter of fact Triumph
> specified 90 weight GL4 in their trannies, and therefore must have
considered
> it safe for their overdrives which up to about 1973 were identical to ours.
> Because Hypoid, or EP oils contain additives to protect gears which have a
> slipping or rubbing action, such as hypoid form gears, I was taught that
using
> a Hypoid or EP oil in an assembly that requires friction to function, such
as
> a synchronizer or wet a clutch would cause them to malfunction because the
EP
> additives would eliminate the required friction. Triumph must not have
gotten
> that message because their specification for the TR6 calls for a Hypoid or
EP
> oil and their trannies and ODs seem to function normally.
> Bill Lawrence
>
> > Date: Sat, 14 Nov 2009 15:57:34 +0100
> > From: coudesluijs@chello.nl
> > To: lapierrem@sbcglobal.net
> > CC: healeys@Autox.Team.Net
> > Subject: Re: [Healeys] Dave Dougan's overdrive part 2
> >
> > Redline MT90 can be used but is not easily available, at least not in
> > the NL. There are other similar oils (GL-4), some synthetic others
> > mineral: Quaker state HP or Synquest, Millers EP, Shell Spirax GX,
> > Texaco Multigear MTF and others. Practically all are hard to find and do
> > not add much if anything at all in normal applications to simple 20W50.
> > These oils do not contain S or Cl containing compounds to do damage to
> > brass baulk rings or other Cu containing metal parts.
> > Kees Oudesluijs
> > NL
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