Transmission fluid

[R3DLT1]

Wat transmission fluid do you guys run?

Ive heard bad things about mixing synthetic fluid into a transmission...is this true?

[95ztrey]

Mobil1 Full syn

[YZF]

I think I put mobil 1 full syn in my 6 speed, my auto car probably just a merc dexIII but I'm not sure, haven't changed the fluid yet.

[mrbadlt1]

x2 on mobil 1 syn in my car

[R3DLT1]

You have a minimum of two frictions in the A4 that
you care about - or more. The planetary engagement
clutches, the band and the torque converter clutch.

Out of GM these were all selected / spec'd to be all
happy with common DexIII as you'd expect. When
all that was being worked, bet that synthetic ATFs
were not so commonly available, and perhaps not
part of the process.

In the name of fuel economy our 4L60E is controlled
with the bare minimum of presssure applied, based
on a stock motor assumption and backed up with
an adaptive learning for pressure w/ slip. Good thing,
right? Yeah, for your Aunt Mabel's unmodded Z28,
as if. The learning makes your pressure relax when
things are going smoothly and then gets surprised
and slips whilst playing catch-up every unusually
hot day, or event. Computers is stupid.

With adaptation constantly positioning you on the
edge of slip, no wonder you see it occasionally.
And every occasion stands the chance of adding
a little bit more glaze to your clutch surfaces. Or
popping the slip codes.

Anyway, factory frictions and stock output is one
thing. Increase the output, lessen the grab (by
slipperier fluid), maybe fool the airflow with a
voodoo mod or two, and your PCM will not have
the clue to command the -needed- line pressure.
Reduce the TCC clutch radius (one component of
torque), maybe use a set of clutch components
from an OE design that was smaller so as to fit
(but smaller, always comes from a smaller motor
and was designed for less breakaway torque), why
not throw in a non-OEM converter clutch material
system while you're at it (just for fun) and then
depend on adaptation to bring the pressure on up
to compensate for it all? Reliably? Yeh.

Friction modifiers are added to -raise- the friction
of clutch material against the steels. Super. Make
up for some of the problems from small components
and low line pressure per load. But down in the guts
the good ol' bronze bushings of yesteryear have
been replaced by plastic ones on account of it
saved GM a penny and a half per unit. Plastic
bushing on steel shaft looks not so unlike organic
clutch on steel plate, only bushings are not supposed
to have their friction increased. If you take and put
some old-school "super shift magic goo" in there,
formulated before people were so clever as to use
plastic in the powertrain, that's a roll of the dice.
Snake eyes being a chowed bushing that only can
be gotten to by a full teardown.

(site my sourse)
http://www.ls1tech.com/forums/automatic-transmission/589748-brand-tranny-fluid-u-using-2.html

[Spartan7]

If you have a stock tranny, I would stick with regular Dextron III.

[R3DLT1]

i ended up going with non synthetic fluid this time. Lets see how things work.

[popo8]

Dex in my 6 spd....

[93v8clone]

i use b-g products full syn in mine ,its stock internaled and a 4k converter "knock on air cause wood rots " its still ok

[jakesz28]

Case hydro-gaurd in my tranny.


What a hyd. tranny fluid for a tractor. Yep. If it is good enough for a combine it is good enough for me.





This is with a power glide though. If you have the stock tranny dexIII is what it takes and synthetic stuff is to hard to clean off of the track when it spills.

[jaysz2893]

i use Redline D4 ATF in my t-56. I got hooked on it when i had my 93 Eclipse and it had that crappy 2nd gear syncro problem that plauged all the 1st gen DSM 5 speeds.