Transmission Fluid

Topic: Transmission Fluid (Read 1079 times) previous topic - next topic

Transmission Fluid

November 29, 2008, 10:12:37 AM

I couln't find a previous thread about the different transmission fluids availible. What do you guys use? My tranny (to my knowledge) has not been rebuilt, altered, or anything. The users manual cals for Mercon, and I know Dextron III/Mercon is what common parts stores sell, and I can also get the universal for Dextron III/ Mercon and for Allison transmissons.

What do you guys use?

Transmission Fluid

Reply #1 – November 29, 2008, 11:49:42 AM

type F= slightly less lube= less slip = firm shift = less clutch pack wear

DexIII/II = slightly more lube= slightly more slip = softer shift = slightly more clutch pack wear

Transmission Fluid

Reply #2 – November 29, 2008, 04:18:48 PM

There guys running john deer tractor fluid in them with no filter.

tractor fluid?

Reply #3 – November 30, 2008, 04:26:21 AM

Quote from: Haystack;245346

There guys running john deer tractor fluid in them with no filter.

Isn't it called Hydraguard or something like that? Does anyone know the part # and price to try some of that stuff? The Dextron VI doesn't seem to be working as good as Type F imho. Then again that valve body was different and set up for hard shifts.
GM is using Dex VI in all of their new transmissions as replacement for Dex III. Dex VI is backwards compatible with Dex III. and has better lube properties, a higher friction coefficent, longer service life and a higher price tag. Some are using Mercon V as well.
It would be cool to see if that tractor stuff shifts harder than type F

Transmission Fluid

Reply #4 – November 30, 2008, 04:44:02 AM

#21 TRANSMISSION FLUID

Type F - sticky, low lubricity, recomended for KEVLAR clutches in racing applications where it is serviced often.

Mercon/Dex III - Blend ATF with higher breakdown temp, more lubricative than F, recommended for all street and racing applications with all clutches.

Mercon V - Synthetic, highest breakdown temp, more lubricative than Mercon/Dex III, recommended in all street and racing applications with all clutches. Specially formulated for electronic transmissions with TCC.

Hydrostatic Tractor Fluids - Hygurad for example available through John Deere. Chemicaly resembles Type F, but has chemical properties that allow it to resist slippage and take the heat better. It is NOT highly lubricity and should be checked often. It is CLEARISH fluid and makes for a great diagnosis of transmission issues.

http://www.clickclickracing.com/forums/showthread.php?p=32777

Its harder then type f, spools higher and stick better. It also has better heat properties then type f or mercron.