JB04Mach1

I had to drain the fluid out of my transmission in my mach 1. its a5- speed and i was just wonderin what kind to to put back in it? [sm=feedback.gif]

5speedstang

i had switched mine to ams oil and i thought it smoothed it out but when i just did my clutch i had put mobil one back in it and wow. 100 percent better.

jmac72187

Tremec told me to put in 3.17 quarts of Dex III. The original specs were for more fluid, but that is what causes the hard shifts into 2nd and third for some people.

Crofts123

The Tremec TR-3650 5 spd transmissiontakes regular Mercon. Fill it until it comes out the top hole.

jmac72187

If you mean to the brim... Call Tremec and ask. They have changed the spec to 3.17.

MACH5IVE

http://www.americanmuscle.com/royal-...ion-fluid.html

This is what i use! Works fine and i have real smooth shifts, no problems at all!

OzzDOA

Don't use a synthetic in the 3650, over time it will eat the syncro materials. TTC (Tremec) specs 3.17 (3.0 liters) quarts of Dexron III/Mercon non-synthetic ATF. Dexron V will also work since Dex III is being phased out.

MACH5IVE

In the years that i've owned my mach and several oil changes, i've never had problems with RP synthetic.. I take it you have..

OzzDOA

Nope, never had a problem with the RP stuff. I have their synthetic gear oil in my rear. What lead me to research this issue so much is the TSBs and 2nd and 3rd gear shift problems the pre-2004 3650s had. I emailed Tremec about synthetics and on of their master techs explained that because of the alloy that the syncros are made out of synthetics aren't suggested since they will cause pitting and softening of the syncro gears thus shortening their life. I figured I'd stick to what the service manual and the master techs said.