KRB

Now that warm weather is on the way I'm ready to install an aftermarket remote tranny cooler. The Valvoline synthetic fluid I was using is no longer available. What synthetic tranny fluid do you all like?

Also, I'm planning on a Derale cooler with fan. For you guys with a Derale, is the 18500 the one to get? 30,000lb & 1/2" ports.

Thanks for your opinions.

Ace

I've been trynig to locate some of new Dex VI for the 727 in my old Chrysler, but no luck so far...

Mcmopar

Why not use ATF +4? Fully synthetic and from NAPA, Valvoline part number VV-346.

Ace

You might want to re-read this thread:

https://www.dieseltruckresource.com/...&highlight=TSB

Mcmopar

Interesting reading, I've had no problems with my 727 crew cab?? Have you?

Ace

I think you may be able to get away with it. Some people have reported running it with no problem. But I think if you work the truck hard it will cause problems. The + fluids have very different friction characteristics than the earlier fluids. They are made with a proprietary Lubrizol add pack specifically designed for the newer friction materials in the later model transmissions. It was released for licensing by 3rd party blenders only last year. That is why the stuff was so expensive and available only from the dealers until recently.

DBF

I prefer AN fittings (fewer leaks) so I went with the AN -8 size Derale 15850 (30,000#) and used a Derale AN -8 switch 15721. I put the switch in the output of the cooler so anytime temp out goes over 180, the switch turns the fan on. Also have a switch in the cab that turns the fan on.

I use ATF+4.

Regards, DBF

KRB

Thats whats got me messed up in the first place. I searched the forum a few days back to find out what the preferred fluid was and came away more confused than when I started. Basically what I determined the concensus to be was that its best to run what was originally made for the tranny and not what is made for the new ones even if it says its backwards compatable.

But now DBF says that he uses +4 and from reading his earlier posts on cooling, he does a lot of towing and should know if +4 is a problem or not.

By the way DBF, "I prefer AN fittings (fewer leaks) so I went with the AN -8 size Derale 15850 (30,000#) and used a Derale AN -8 switch 15721. I put the switch in the output of the cooler so anytime temp out goes over 180, the switch turns the fan on. Also have a switch in the cab that turns the fan on.", thats EXACTLY what I was looking for. I'll order it ASAP. How long have you been using the +4 now?

Ace

DBF is also running an aftermarket torque converter and valve body. That makes his tranny a whole different animal.

GasganoFJ60

I run an AMSOil 100% Synthetic ATF in my 93 and its worked out perfectly. Shifts smooth and the extended drain life helps save lots of cash. Try AMSOil.com or locate a dealer in your area.

KRB

Which type?

GasganoFJ60

The standard Synthetic ATF. Its universal. They do offer a high-torque oil for heavier aplications but the ATF works just fine for my stock engine and trans. My parents also run it in their 02' Duramax w/Allison and its run like a charm, even with a 100hp chip and my heavy foot.

here is some site info on the Universal ATF
https://www.amsoil.com/storefront/atf.aspx
From that page you can read up on all of its different ATF products and other synthetic products.

ccab85

Aerospace lubricants ATF in mine with Lube Gard for a friction modifier. I have extensive mods and a Suncoast converter with aprox 10000 miles so far.

KRB

Hmmmm, now even more confused. I have never heard anything bad about Amsoil products and figured that would be the route to take. Only thing is, how can one product "do it all"? Everything from Dexron III to ATF+ & ATF+4 and even hydraulics?

How long/many miles have you guys been running it?

Thanks

Ace

Yep, Amsoil does it all. That's all you ever need to know about any kind of oil or lubricant - Scamsoil !