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!!

Re: Hydraulic Fluid in automatics
 

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

Re: Hydraulic Fluid in automatics
 

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

Re: Hydraulic Fluid in automatics
 

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

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.

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

Re: Hydraulic Fluid in automatics
 

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

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

Re: Hydraulic Fluid in automatics
 

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

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

Re: Hydraulic Fluid in automatics
 

We ran it in the Nova and it worked fine. Supposedly more consistent. I don't have data to back that up. I don't like the smell of it or the feel so probably wouldn't use it again. I have it in my Chevelle bracket car but will most likely put ATF back in it when I change it.

Re: Hydraulic Fluid in automatics
 

I run Amsoil screw compressor oil in our super comp cars as it seems to be more consistent while on the stop. Now that we are jumping into stock as well I have not decided if we will run it in the car.

Brian

Re: Hydraulic Fluid in automatics
 

Interested in this..
Anyone else with a similar experience in a small engine Stocker?
Best place to buy?

Re: Hydraulic Fluid in automatics
 

Just remember if you use TDH in a trans make sure you use the winter blend ---it is clear whereas the summer blend is "Orangish" in color---you can buy JD TDH at most farm supply stores , some Walmarts sell it also Autozone Napa etc& other auto parts stores can get it for you too--- stuff works great in rear ends too---race only not on the street rears

Re: Hydraulic Fluid in automatics
 

I was told by a great super stock racer that's no longer with us to use John Deere TY22000. He said with atf fluid he changed it every 50 passes and the John Deere he put it in and ran it 150 passes when he would pull trans to freshen it. I ran it in a bracket car with a ford C4 with great luck and that's what he ran also. I just built a fresh C4 for a street truck put it in it but hasn't been long enough to tell how it will workout on the street. Around a 1000 miles so far so good.
Terry