I would recommend a part synthetic to GL5, usually these are 75w-90. The
gear oil in an overdrive car is doing a huge amount of work and should be as
good as you can get.
John Kipping
----- Original Message -----
From: "Jerry Barr" <jerrybarr@charter.net>
To: <fot@autox.team.net>
Sent: Friday, March 18, 2005 10:40 AM
Subject: Transmission Oils
> Hello Group,
>
> I am installing a new transmission with a J type overdrive in my GT6 and
> am STILL confused about what type of lubricant to use in the
> transmission/overdrive unit. My Standard Triumph factory manual said I
> should use 80w-90 GL4 gear lube but I have heard lots of different
> recommendations. I use 40w oil in my TR3 and 20w- 50 in the non
> overdrive transmission now in the GT6 with good success. Does this
> esteemed group have any recommendations?
>
> Regards,
>
> Jerry Barr
>
>
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