Syn. tranny fluid

[99 7.3]

Going to put my 6.0 tranny cooler in this monday and wondering what kind is everyone running? Amsoil Torque Drive, Amsoil Universal ATF, Mobil 1 or Royal Purple (whatever kind they say to use). just reading amsoil ad. and it says mercon and mercon5 ok for 4r100. i thought that mercon 5 was a no no. now what about torque drive - thats mercon 3. just need a little help thats all. any info would be great!! thanks!!

[Performance Oil Products]

Amsoil Universal

[99 7.3]

is that what u are running in ur ride?

[fleastang]

I used Amsoil for years and sell it now. Amsoil Universal has never let my Powerstroke down. It is good stuff; won't break down under the temps or pressure that the regular stuff will do and your tranny will probably run a little cooler temps too.

[Performance Oil Products]

Yeah I run amsoil front to back on both of my PSD. Even the uni is SP rated for the 5r100. I'm a dealer but just didn't jump into it. I used amsoil for over 6 years b4 I became a dealer. I love every product they have.

You can sign up for a dealership or preferred customer program and get wholesale pricing. I know myself and anyother dealer would be glad to help you out get started.

If you decide not to go with amsoil, then for your tranny an diffs I would use Royal Purple

Shawn