I try to follow OEM recommendations but do stray on some lubrication
issues. Some times the OEMs have no clue. The LT77 5-speed is one such
example. Started as SAE 75 gearbox oil, then they recommended engine
oil, then ATF. I also believe MGs started with gearbox oil then changed
their recommendation to engine oil to improve shift action.
In most of my manual boxes, I use Pennzoil Sychromesh Transmission
fluid. Its a synthetic low viscosity (slightly thicker than AFT,
Almost the same as 10weight oils, designed to solve some heat and
bearing related failures in GM Fiero transmissions made by Getrag (or so
I've heard). Its very popular with the T5 Mustang crowd. Seems to keep
smooth shifts in a box that well known for balky upshifts (fiber sychros
are not too strong).
On 4/28/2012 7:39 AM, Charley & Peggy Robinson wrote:
> Actually, it sounds like there was something bad about the design of
> the gearbox and the ATF was a patch on the problem. Glad it worked
> out for you, though.
>
>
>> I am an engineer from good old Blighty and I know that engineers can
>> be wrong. I bought a new Maserati Biturbo and found that 2nd gear
>> sucked. I heard Alfa Romeos had the same problem but had solved it by
>> using ATF so I tried it. Worked beautifully and my gearbox worked
>> like a Swiss sewing machine for years. So the engineers were wrong
>> and recommend the wrong oil. One consideration is that modern
>> machinery means closer tolerances which effects any reconditioned
>> engine that has had the bores, pistons, and piston rings done.
>> Another consideration is that oil, petrol, and grease have changed
>> since MGBs were pups.
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