tim4daflow

im still deciding which DEX 6 fluid to swap to amsoil or redline they both seem like good fluids any input on these two would be appreciated i want to have the best possible fluid in the tranny if im gonna get drag radials. and also i couldnt find anything on why dex 3 is not good for our trannys, just curious on whats the difference in the two since my old gtp with the same tranny took dex 3 if we put in dex 3 in a ls4s tranny would it fail?

91parkave

iTrader: (4)

Shoot a email to tep about his recipe blemd

tim4daflow

cool dave making his own now

spawne32

iTrader: (2)

been using redline for years, ill never use anything else

91parkave

iTrader: (4)

From the other high hp cars Dave doesn't use a fluid like dex6 due to it being to thin to him, don't quote me on this but tend is like 70 30 dex 3 and cat hydraulic oil mixed together.

superglide9375

use redline in bike trans,and tried royal puple thisd time seems ok

08 pimpala ss

I use a 50/50 mix of dex3 and cat 30 transmission drive oil it's awesome

spawne32

iTrader: (2)

id feel safer using a synthetic type F rather then cat 30 drive oil lol do you have a PN for what your using?

tim4daflow

What is cat 30 oil? And how long have you been using the mixture?

spawne32

iTrader: (2)

there are various grades of transmission fluids you can get that do not have friction modifiers, similar to the way you can get compressor oil (oil without additives) or SAE straight weight oils for car engines. john deer hy-gard is a very common one used in racing applications that the old timers use to tighten up converters and allow the clutches to bite harder, but id be hesitant using any of these oils in a modern trans. The synthetic modern day type-f compatible fluids are far superior then the original standard so you can get the same effect with the risk of damaging internal components. I have redline D4 and racing ATF (sythetic type-f) sitting waiting in the wind to be swapped into mine, 4 quarts of each which should in theory provide the efficiency bump im looking for.

tim4daflow

So what is the specific reason gm says to put dex 6 in these trannys, I mean could I just use all type f racing fluid? May sound dumb but I don't know jack about the "whys" of trannys

08 pimpala ss

The part number for the 5 gal is 8t-9570 and it's Dave's mixture I ran it for 6 months straight with no issues before the motor let go and I'm using now. It's really thick compared to dex 3 my Trans holds 16 quarts with my pan and spacer setup well 15 plus the quart I put in the converter

tim4daflow

So you add roughly 7.5 gallons of dex 3 and then 7.5 gallons of the cat oil

spawne32

iTrader: (2)

Two big reasons they revised the dex3 spec to dex6, one being that a thinner fluid increases MPG through efficiency in the trans (which causes the backwards side effect of increasing stall speed), and two being that the improved additive package and improvements in sythetic blending make for a longer lasting fluid that reduces warranty returns due to premature fluid failure.

As far as dex itself needing to be required, its merely the addition of friction modifiers that interact with the clutches in the type of transmission your using that determines what type of fluid you use. Would I recommend running straight type-f? No probably not, because it doesnt have friction modifier at all. But blending usually serves people quite well in whatever application they have to use it for. Dave's blend as well as others in here are merely just shots at improving clutch grabbing power, firming up shifts, and increasing efficiency through the converter using a higher viscosity fluid mixed in. We know that Type-F IS compatible in use with the 4t65 as well as others like the 4l60 etc, but when you start goofing around with brand specific fluids, especially stuff designed for allison transmissions or large construction and demolition equipment, or fluid that wasnt even designed to go into a trans, you run the risk of finding out the hard way that it doesnt let your trans live very long.

91parkave

iTrader: (4)

I don't know, I mean Dave does it for a living and the fluid he uses has held together the majority of the 500+whp 4t65es. I don't think this was just some shot in the dark for tep.

spawne32

iTrader: (2)

ok ill be fair, an "educated guess". Problem is the lack of 500+whp 4t65e's in general, and the fact that they rarely last long enough to say whether or not the fluid has any long term issues.

tim4daflow

I don't know where my hp/tq numbers are but I would bet I'm between 450whp - 500whp when on nitrous and I keep losing 3rd gear I just wanna get the best fluid I can to help this tranny last

spawne32

iTrader: (2)

Trans fluid might not be the saving grace for your trans, you have to analyze what exactly is failing. What keeps breaking that's causing you to lose third?

tim4daflow

3rd sprag is what breaks on mine which is a part dave said rarely breaks and I've broken 1 chain

08 pimpala ss

It's 2 gal of each 4qts is a gallon