Hydraulic Fluid in automatics

L Peterson6261 · 10-19-2018, 04:55 PM

Would someone who has used hydraulic fluid in their automatic transmissions be willing to share the advantages and/or disadvantages to using it over regular ATF. - Thanks!!

Ed Wright · 10-19-2018, 05:17 PM

I can not imagine what the advantage would be. Sure be interesting to hear.

Mike Graham · 10-19-2018, 05:33 PM

It is more consistent from run to run. We use John Deere 303

Tim H · 10-19-2018, 05:59 PM

I recall reading numerous posts about this on YB many years ago.

Dragsinger · 10-19-2018, 06:22 PM

a respected/experienced converter builder tells me it "tightens" the converter 200 RPM. After some experimentation, I have settled on name brand Dexron/Mercon III. [that is to say, not a house brand] Valvoline, Pennzoil, Castrol, etc. The house brands, while OK for basic passenger car service, do not have the premium additive package to resist heat over time.

jmantle · 10-19-2018, 09:47 PM

The specific gravity of the fluid will have more influence on the stall speed than the viscosity. Synthetic fluids change viscosity less with temperature than dyno fluids so will be more consistent, look for a fluid built with group 4 base stock.
Confusing, yes, I do this stuff for a living.

Jim Mantle V/SA 6632

FLOYD RUSSO JR · 10-20-2018, 01:39 AM

A friend of mine here in gonzales la been running that !!! Keith hunter w powertrain specialist !!!! Works gd !!! Js

Kenny Bomar · 10-20-2018, 04:56 AM

I long time friend and serious bracket racer who owns a trans shop told me it does run a little more consistAnt but if you get into close back to back runs it doesn't stay as cool as regular trans fluid

ALMACK · 10-26-2018, 08:45 AM

I run the John Deere Hygard fluid in mine ( $ 17 a gallon)

Jeff Stout · 10-26-2018, 09:46 AM

I understood in using it to tighten a N/A converter that gets nitrous applied to it. With nitrous a converter becomes way to loose and with the hydraulic oil it will bring it back 3-400 rpm's

10-19-2018, 04:55 PM	#1
L Peterson6261 Junior Member Join Date: Jul 2009 Location: Eugene, Oregon Posts: 66 Likes: 128 Liked 38 Times in 13 Posts	Hydraulic Fluid in automatics Would someone who has used hydraulic fluid in their automatic transmissions be willing to share the advantages and/or disadvantages to using it over regular ATF. - Thanks!! __________________ Larry Peterson Stk: 6261 B/SA

10-19-2018, 05:17 PM	#2
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: Hydraulic Fluid in automatics I can not imagine what the advantage would be. Sure be interesting to hear. __________________ Ed Wright 4156 SS/JA

10-19-2018, 05:33 PM	#3
Mike Graham Member Join Date: Jul 2002 Posts: 410 Likes: 1 Liked 341 Times in 67 Posts	Re: Hydraulic Fluid in automatics It is more consistent from run to run. We use John Deere 303

10-19-2018, 05:59 PM	#4
Tim H VIP Member Join Date: Jan 2007 Posts: 1,039 Likes: 1,062 Liked 481 Times in 158 Posts	Re: Hydraulic Fluid in automatics I recall reading numerous posts about this on YB many years ago.

10-19-2018, 06:22 PM	#5
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,760 Likes: 5 Liked 99 Times in 60 Posts	Re: Hydraulic Fluid in automatics a respected/experienced converter builder tells me it "tightens" the converter 200 RPM. After some experimentation, I have settled on name brand Dexron/Mercon III. [that is to say, not a house brand] Valvoline, Pennzoil, Castrol, etc. The house brands, while OK for basic passenger car service, do not have the premium additive package to resist heat over time. __________________ Larry Woodfin 471W

10-19-2018, 09:47 PM	#6
jmantle Member Join Date: Feb 2008 Location: Black Creek, BC Canada Posts: 329 Likes: 74 Liked 169 Times in 80 Posts	Re: Hydraulic Fluid in automatics The specific gravity of the fluid will have more influence on the stall speed than the viscosity. Synthetic fluids change viscosity less with temperature than dyno fluids so will be more consistent, look for a fluid built with group 4 base stock. Confusing, yes, I do this stuff for a living. Jim Mantle V/SA 6632

10-20-2018, 01:39 AM	#7
FLOYD RUSSO JR Member Join Date: Jul 2004 Location: GONZALES,LA Posts: 247 Likes: 2 Liked 1 Time in 1 Post	Re: Hydraulic Fluid in automatics A friend of mine here in gonzales la been running that !!! Keith hunter w powertrain specialist !!!! Works gd !!! Js

10-20-2018, 04:56 AM	#8
Kenny Bomar Member Join Date: Nov 2002 Location: mphs tn Posts: 223 Likes: 3 Liked 424 Times in 50 Posts	Re: Hydraulic Fluid in automatics I long time friend and serious bracket racer who owns a trans shop told me it does run a little more consistAnt but if you get into close back to back runs it doesn't stay as cool as regular trans fluid

10-26-2018, 08:45 AM	#9
ALMACK VIP Member Join Date: Jan 2009 Location: Bardstown, KY Posts: 1,935 Likes: 129 Liked 369 Times in 127 Posts	Re: Hydraulic Fluid in automatics I run the John Deere Hygard fluid in mine ( $ 17 a gallon) __________________ Alan Mackin Stock 3777/ SS 3377 P/SA & SS/PA Fox Thunderbird I/PS '95 Mustang GT

10-26-2018, 09:46 AM	#10
Jeff Stout VIP Member Join Date: Dec 2001 Location: phoenix Posts: 1,484 Likes: 65 Liked 704 Times in 281 Posts	Re: Hydraulic Fluid in automatics I understood in using it to tighten a N/A converter that gets nitrous applied to it. With nitrous a converter becomes way to loose and with the hydraulic oil it will bring it back 3-400 rpm's