04gt 3650 Oil Change

LouisianaZJ · May 29, 2005

I'm getting close to 10k miles, so it is probably past time to drain the trans fluid.

Castrol/valvoline/penzoil, etc Dex/Mercon III fluid ok?

and how much do i need? 4 quarts?

Pearl02 · May 29, 2005

Read your owners manual. You shouldn't have to change the tranny fluid for awhile. It's synthetic. Pearl02.

Give Me TP · May 29, 2005

3L (3.2 Quarts) of Dexron III

bdcardinal · May 29, 2005

mobil 1 ATF, thats all my 5 speed ever sees.

Mustang5L5 · May 29, 2005

you should be able to get a lot more than 10K miles between trans fluid changes

bdcardinal · May 29, 2005

ya i think its about 30k according to the manual. i usually do mine once a year though.

LouisianaZJ · May 29, 2005

yeah, probably

it has 1 yr but it is like 90% city driving

StangPro · May 29, 2005

Factory fill is Mobil1.

Unless you use Royal Purple, Amsoil or Red Line you can almost expect to have shift problems or noise as the 3650 has some issues.

Fluid swap procedure here:

http://www.stangpro.com/html/tutorials/other/transfluid.htm

Mustang5L5 · May 29, 2005

StangPro said:
Factory fill is Mobil1.

Unless you use Royal Purple, Amsoil or Red Line you can almost expect to have shift problems or noise as the 3650 has some issues.

Fluid swap procedure here:

http://www.stangpro.com/html/tutorials/other/transfluid.htm

That's why i kinda say "If it ain't broke, don't fix it"

Some guys actually make their shifting problems worse by changing the fluid depending on what type they use.

I beleive '04 was the first year ford put Mobil 1 in there fromn the factory.

I should really do a fluid change myself...but you know what they say. "If it aint' broke....."

StangPro · May 29, 2005

All 3650's had Mobil1 and they all have issues.

Sticking with Mobile 1 isn't a bad choice, but there are better options.

SilverGTV8 · May 30, 2005

I used royal purple ATF and have had no issues.

hotrodnut · May 31, 2005

I'm having good luck with Motorcraft MERCON ATF #XT-2-QDX at 3.7L.

2k2fourpointsix · May 31, 2005

SilverGTV8 said:
I used royal purple ATF and have had no issues.

Ive been dealing with the notch 1-2 shift since my car was new, just last nite at 34k on the odo I finally swapped out the fluid and put in some royal purple, 4 qts. I know they changed the fill level to 3.2 but I think that was a band aid fix and would prefer to have it full. I was reluctannt to swap the fluid b/c I didnt think it woul actually improve the shift quality that much, well i was wrong. I never thought it would work so well. The tranny is much much quieter now, and the 1-2 shift quality is great. I didn't realize how loud my tranny was untill after the RP fluid. My recomendation is RP all the way well worth the cost and 40 mins to change it.

trinity_gt · May 31, 2005

2k2fourpointsix said:
Ive been dealing with the notch 1-2 shift since my car was new, just last nite at 34k on the odo I finally swapped out the fluid and put in some royal purple, 4 qts. ...

You're talking about Royal Purple Synchromax, right?

2k2fourpointsix · May 31, 2005

trinity_gt said:
You're talking about Royal Purple Synchromax, right?

Yup its the only stuff I will use from now on.

05SonicBlueGT · Jun 6, 2005

I have the 05 GT and I'am looking to improve the car all I can, has anyone tried the Amsoil for the Manual trans. or rearend?

hotmustang331 · Jun 6, 2005

I have 22890 on my 04 and havnt changed it...but i will throw in some RP when i change it...have RP in my rear axle and it works great.

trinity_gt · Jun 7, 2005

Been doing more research. Everything I've read or seen on the 3650 indicates that one is to use ATF in it: e.g.

- 2002 GT shop manual states Mercon Synth ATF
- this http://www.fcsdchemicalsandlubricants.com/fad/quickref/mantrans.pdf
- TSB 04-15-6

and so on. And people are putting synchromesh gear oils in (e.g. Royal Purple Syncro Max versus Royal Purple Max ATF) and getting better results??

Does anyone know Tremec's position on what fluid to run?

hotrodnut · Jun 7, 2005

trinity_gt said:
Does anyone know Tremec's position on what fluid to run?

I called Tremec and talked to John, he said do not use GM Syncromesh (he did not mention RP Synco Max) because it swells the fiber material used in making the Synconizers in the 3650 transmission. He said use Mercon III / Dexron III at a quanity of 3.0 to 3.2 ltr. I now use Motorcraft MERCON ATF #XT-2-QDX but I could not bring myself to lower the fluid level from the specified 3.8L of the '03 owners manual to what he suggested. I did fill it to the 3.7L as specified in the '04 owners manual though.

He said the specified fluid of Mercon Synthetic or any synthetic, is too slippery and there is not enough friction for the syncronizers riding against the dog rings to get them up to speed to match gear engagement. That is why the TSB and the new '05 Manual states using Motorcraft MERCON ATF #XT-2-QDX fluid.

2013 Geee T · Jun 7, 2005

I had tried Redline in mine and it acutally made it a little worse. Then I went to Dexron III and it helped it out.

04gt 3650 Oil Change

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