What Transmision Fluid For My Tremec T-5?

[Mustang5L5]

I wouldnt use motor oil or anything else when there are quality synthetic ATF's out there.

+1, the WC T-5 cannot run motor oil or gear oil. It's just too thick. It needs the thinner ATF to lubricate the inner bearings. The trans may shift fine, but you are hurting the bearings on the mainshaft (which is expensive)

Early non-WC t-5's could run the thicker gear or motor oil...82-mid 84

 

[Mustang5L5]

EDIT: Mike posted while I was typing.
Good luck.

I feel better when someone agrees with me

 

[85_SS_302_Coupe]

Dex III, and stay away from Syncromesh unless it's a 3550 or TKO.

 

[Joey5.0]

Ok im good to go then. I just got done under the car and (2) bolts were not tight AT ALL and was leaking from those two bolts. I also had way to much fluid in there.

 

[Mustang5L5]

What two bolts? You said that it was leaking from the front of the trans so if you tightened the bolts attaching the trans to the bell housing all you did was seal the fluid inside the bell. You'll still have a leak

 

[Joey5.0]

it was leaking from a couple of bolts that connect to the Bellhousing. None was in the bellhousing.

 

[Mustang5L5]

Well then you still have a leak. It's leaking down from the input shaft which is INSIDE the bellhousing. You'll need to take the t-5 out to fix that.

The tailhousing to the main case holds fluid, but the tranny to the bellhousing is a dry connection. No fluid should leak there at all. If it is it's coming from the input.

 

[STANGateURlilSS]

WHen is it full? Right when it starts pooring out of the fill or right when it stops pooring out of the fill?

And can someone please confirm that i am using the right Tranny fluid?

yes the later t5s run atf.. and yes your t5 calls for atf

 

[Joey5.0]

Well then you still have a leak. It's leaking down from the input shaft which is INSIDE the bellhousing. You'll need to take the t-5 out to fix that.

The tailhousing to the main case holds fluid, but the tranny to the bellhousing is a dry connection. No fluid should leak there at all. If it is it's coming from the input.

Its hard to describe but there is no fluid in the bellhousing. It is impossible to leak into there from where the actual leak is/was.

 

[tunedin302]

Its hard to describe but there is no fluid in the bellhousing. It is impossible to leak into there from where the actual leak is/was.

 

[Joey5.0]

These two bolts are what i am talking about. They were not tight at all and were leaking.
View attachment 449633

 

[tunedin302]

This is the bellhousing:

View attachment 449609

 

[Mustang5L5]

So then that's the tailhousing to main case seal.

 

[Joey5.0]

This is the bellhousing:

View attachment 449545

No S*** Lol