ZF5 trans. fluid replacement ?

[7.3 on 40s]

Had my 97 F350 for about a month now and cant see myself ever getting rid of the truck so i thought i would make sure things are up to par. From the research i have done it looks like a 97 F350 7.3 with a ZF5 trans. takes 3.5 quarts of a motorcraft fluid # XT-2-QSM. Which seems to be a fully synthetic ATF. I was wondering your alls thoughts on manual trans. fluid in these trucks. It seems like royal purple fluid is the Syncromax. Amsoil has a fully synthetic ATF. Mobil 1 seems to have a fully synthetic mercon V ATF. I called my local parts place that sells motorcraft fluids and after running the XT part number he said the number supercedes to a new number and i had him order in 4 quarts from his warehouse for me to go check out tom. says they are 7.75 a quart. Does it sound like I am on the right track????

[gaspipe]

I'm running Redline MTL in mine since rebuilding it. I fill it from the shifter, and use a whole gallon.

[atvrider93]

Originally Posted by gaspipe

I'm running Redline MTL in mine since rebuilding it. I fill it from the shifter, and use a whole gallon.

You fill from inside the truck? Why a whole gallon?

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[sgg93]

Filling from the shifter hole allows you to effectively over-fill the transmission, which quiets down the gear rollover that comes with a SMF swap.

[95Strokeee]

Yes, but overfill will cause overheat. So don't overfill too much


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[madpogue]

We had Mobil 1 Synth ATF in both trucks for a while, and TBH, I'm not impressed with the winter performance. Notchy shifting. Switched the ECLB to a Fleetguard (?) product that the local International shop _claims_ is every bit as good as Castrol Transynd, which is another highly recommended synth ATF, frequently used in Allison trannies and supposedly very similar to Amsoil TorqueDrive. We'll see how it performs this winter.... Otherwise, I'd start checking the local truck stops for that Transynd.

[Diesel_brad]

The Ford fluid was actually Castrol synthetic ATF. An easy way to tell is if it is GREEN. The MTL is a common "help" to bad syncros. The best thing for them is NOT speed shifting

[7.3 on 40s]

Ok so i went by the parts store today to pickup the fluid they ordered me based on the part number XT-2-QSM which is the fluid the Ford manual calls for. They said it supercedes to XT-5-QSM. What the 5 ends up being is motorcraft mercon V synthetic blend ATF. I called 1 ford dealer and they said all they know is mercon V ATF is what the ZF5 takes. Called another dealer and they said from my vin number the trans. takes XT-5-QSM which is the new XT-2-QSM. Im sure some other ATFs will work as in mobil 1 and amsoil but for those of you who want a factory fluid for your powerstroke ask your ford dealer or motorcraft dist. for 4 quarts of XT-5-QSM. Since the parts store was a motorcraft dist. i picked up 15 quarts of the motorcraft 15-40w super duty oil and a motorcraft filter. Everything was a total of 100 bucks. Not to bad. Cant wait to get the new fluid in and haul some s**t.

[jesilvas]

Ford "says" MercV replaced MercIII, but I'd still use MercIII

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