Hi Jerry and David,
My experience with synthetic in a gearbox is based on my Datsun 5 speed in my
daily driver. Admittedly, we are not talking about the same viscosity oil as
mine takes gear oil and the smooth case take motor oil. There is significant
difference here in the lubricants.
I went to synthetics as cold weather made this box really difficult to shift,
synthetics cured that. However, in hot weather, traveling at highway speeds for
long distances, my synchro action almost disappears when I get off the freeways
and start driving on city streets. It improves if I run on city streets for 20
minutes or so as the oil temp goes down and the oil starts to get a bit thicker.
So, I'll still stick with the fact that in my case at least, the tendency of
synthetics to reduce the effectiveness of the synchronizer baulk rings in my
type
of situation. Baulk rings are a better way to synchronize the trans gears than
are the synchronizer cones in a smooth case. Smooth cases can be improved a bit
by fresh springs under the detent balls, but it can't overcome an ancient
design,
synthetic or mineral oils can't help that!!!
Regards, Paul A
dmeadow@juno.com wrote:
> Jerry,
>
> I have a '61 E-Type with the original Moss box that also suffers from
> slow synchros. I haven't tried this myself, but at least a couple of
> people on the E-Type list have put Redline MTL (a synthetic) into their
> gearboxes and have experienced noticable improvement. It is not
> immediate, they say, but comes after driving some time with the MTL.
>
> I don't know why this is, but it seems to contradict Paul's notion that
> the synchros get slower with synthetics. I'm guessing that it might have
> something to do with the fact that synthetic oils don't tend to be as
> thick at lower temperatures. You'll know what I mean if you've ever
> dumped a quart of Mobil 1 into a valve cover versus a quart of Castrol
> 20w-50. The Mobil 1 will literally fall out of the bottle while the
> Castrol will glug slowly.
>
> David Littlefield
> 1962 MGA MkII
> 1974 MG Midget vintage racecar
> 1951 MGTD
> 1961 Jaguar E-Type OTS
>
> On Tue, 8 Apr 2003 19:27:52 EDT GMGoodman@aol.com writes:
> > I currently have a smoothcase in my "59 Bugeye....Read something the
> > other
> > day and this idea came to mind....looking of experienced
> > opinions....
> > The Smoothcase has slow syncros...and is pretty easy to beat
> > shifting...here's the idea....I have heard that Slick 50 makes a
> > transmission
> > lubricant that makes shifting very smooth and quiets
> > transmissions.....has
> > anyone ever tried this product? It is supposed to be a SUPER
> > Lubridcant...
> > Could it make things more quiet...but more importantly speed up the
> > syncros??????
>
> __
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