|On Fri, 30 Apr 2004 11:00, Dave Thom wrote:|
> I'd understood the mix was to reduce the notchiness... What would give less
> notchiness and less noise/vibration? Is the losses in the gearbox
> noticeable through the oil differences or neglible enough to not matter?
Nope, the mix makes the oil thinner, therefore more vibration and harder to
get between gears, but less losses in the box (and therefore lower temps
Grease would reduce vibration and notchiness, but the gearbox would be, shall
we say, a little lossy ;)
> I've got 2l of Dexron III ATF and about 2 litres of 80w-90 manual gear oil
> left over from when I did my cosmo diff a couple of years ago so I can
> pretty much mix and match any combination...
Yep, those should be safe, I've used Dexron III and standard 80/90 gear oil in
my manual supra and 2 bike gearboxes with no problems.
Dexron III ATF is generally MASSIVLY more highly speced than manual type gear
oils (open up an auto one day and you will see why), therefore it is quite
probably better for the gears, having a much higher film strength, and better
cleaning properties, the cost is noise, vibration, and a notchy change,
although the W boxes are usualy real smooth anyway, it's the R154 that can be
a bit touchy.