dusterdragracer
Drag Racer
Type F with 2 qts 10 or 20 wt engine oil, to help lube. I run a transbrake, so I service twice a season. Never lost a tranny/converter in 10 years, always freshen every 3 years just for safety.They always look fine.
what type trans fluid is everyone using
- Thread starter 68cuda78
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mopardude318
Well-Known Member
from SSD:
The (objectively) best Torqueflite-compatible trans fluid on the market until recently was Chrysler Mopar ATF+4. It is misunderstood by some to be "too slippery". In fact, ATF+4 is a significantly better fluid in every way than Dexron -II, -III, or -IV and ATF+ (+2, +3), and it does not cause, promote, or aggravate slippage. It maintains the specified viscosity across a temperature range that's wider at both the hot and cold ends, its lubrication and antiwear properties are better, it's more resistant to oxidation, sludging and varnish formation, and it smells better. It might even taste better, I don't know. There's an extremely detailed Chrysler Engineering paper comparing every aspect (except taste) of ATF+4 vs. ATF+3, ATF+2, ATF+, and Dexron-III/IV.
Then along came GM's Dexron-VI, which is another extremely high performance fluid (where "performance" refers to all the things a trans fluid has to do...lubricate both metal-and-metal and metal-on-friction without screwing up the frictional elements' ability to grab and keep hold of the metal, remain stable when cold and when hot, resist foaming, resist oxidation, etc).
The RWD Torqueflites really don't need anything more exotic than a good-quality ordinary Dexron (present spec is the newest Dexron VI, though you might still find some older or off-brand Dexron IIIe or other previous Dexrons on the market). I do run ATF+4 in mine, and they all seem happy with it. But the main point here is you really don't need to sweat it. You don't need to spend unnecessary money on exotic-brand fluids or special "race" fluid.
Fact is, Type-F is an archaic fluid with seriously inferior performance by just about every measure. Torqueflites will hold up fine with Type-F, which is mostly an illustration of how rugged the Torqueflite is. There are much funner ways of demonstrating that a Torqueflite is robustly enough engineered to withstand abuse than to use an (objectively) inferior fluid.
As for the diff: The correct viscosity grade of a good brand of synthetic gear lube. 80w90 or 90w140 depending on how loose and sloppy your particular rear axle is. Make sure to use the correct anti-slip additive if you have Sure-Grip.
Needles to say. ive been using the mopar atf with stellar results.
The (objectively) best Torqueflite-compatible trans fluid on the market until recently was Chrysler Mopar ATF+4. It is misunderstood by some to be "too slippery". In fact, ATF+4 is a significantly better fluid in every way than Dexron -II, -III, or -IV and ATF+ (+2, +3), and it does not cause, promote, or aggravate slippage. It maintains the specified viscosity across a temperature range that's wider at both the hot and cold ends, its lubrication and antiwear properties are better, it's more resistant to oxidation, sludging and varnish formation, and it smells better. It might even taste better, I don't know. There's an extremely detailed Chrysler Engineering paper comparing every aspect (except taste) of ATF+4 vs. ATF+3, ATF+2, ATF+, and Dexron-III/IV.
Then along came GM's Dexron-VI, which is another extremely high performance fluid (where "performance" refers to all the things a trans fluid has to do...lubricate both metal-and-metal and metal-on-friction without screwing up the frictional elements' ability to grab and keep hold of the metal, remain stable when cold and when hot, resist foaming, resist oxidation, etc).
The RWD Torqueflites really don't need anything more exotic than a good-quality ordinary Dexron (present spec is the newest Dexron VI, though you might still find some older or off-brand Dexron IIIe or other previous Dexrons on the market). I do run ATF+4 in mine, and they all seem happy with it. But the main point here is you really don't need to sweat it. You don't need to spend unnecessary money on exotic-brand fluids or special "race" fluid.
Fact is, Type-F is an archaic fluid with seriously inferior performance by just about every measure. Torqueflites will hold up fine with Type-F, which is mostly an illustration of how rugged the Torqueflite is. There are much funner ways of demonstrating that a Torqueflite is robustly enough engineered to withstand abuse than to use an (objectively) inferior fluid.
As for the diff: The correct viscosity grade of a good brand of synthetic gear lube. 80w90 or 90w140 depending on how loose and sloppy your particular rear axle is. Make sure to use the correct anti-slip additive if you have Sure-Grip.
Needles to say. ive been using the mopar atf with stellar results.
gtxdude
Well-Known Member
My 65 Dart 904 slips a little from 2nd to 3rd, not to bad. My question is could I drain pan and replace fluid with Dexron would that add a little friction and help? Or would that just muck it up and be worse? I've had 904's rebuilt and they also had me use Dexron over ATF fluid saying it was to slippery. This is older and had sat for a few years, should I do it?
Lonewolf3165
Living the Dream!
There's no "I" in TEAM and no "T" in DEXRON!
gtxdude
Well-Known Member
oops, have to pay more attention to my sphelling!
Lonewolf3165
Living the Dream!
Changing the fluid, no matter what type you use, probably isn't going to help if there's slipping going on. These transmissions are simple enough in design that if there is a slipping problem it's most likely a friction material problem(wear) or leaking piston seal etc. Unfortunately changing the fluid now may make it worse. But if it does you come to the same conclusion anyway. Time to rebuild it.
If I were to go ahead & change it(who knows, you may get lucky) I'd use either Dexron or type F. You don't want to put a high dollar fluid in it just to drain it out & throw it away if it doesn't help.
If I were to go ahead & change it(who knows, you may get lucky) I'd use either Dexron or type F. You don't want to put a high dollar fluid in it just to drain it out & throw it away if it doesn't help.
Lonewolf3165
Living the Dream!
Nah, it's just one of those things. A lot of people seem to do it.
SRT_DSTRHOLC
Well-Known Member
Was told by cope racing to use dex/merc with their reverse valve body and internal parts.
type f Castrol just because that's all I can get the type f in I will check out walmart .
DexTron VI , put on lots of miles during the summer 5 - 10k , between traffic jams in 90+ heat and running the 1/4 mile I want the best , as in take the heat fluid . If I was just running the 1/4 mile(i'd be changing it more often ) or less than 2,000 miles a year probably run a cheaper fluid
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