Tranfer case fluid

[ivrodriguezfx4]

Hi guys i have a 2006 screw 4x4 with a 5.4 engine and with 36000 miles. My problem that i am having is I repared my trasmision twice already, the last time the mechanics replaced the fluid of the tranfer case 4x4 and now when i reach about 50 miles to 60 the truck star making a weird sound like a wining sound, i ask the mechanics what oil he used and he told me Do3 something like that. I went to the manual and it say Motorcraft MERCON ATF, i went to the dealer and they told me to use MERCON V as it is on the trasmission. I dont know what to do? If i should use the MERCON V or MERCON any imputs guys will apreciated.

[Bindernut]

MerconV is the current Ford spec. Have the shop that did your tranny work drain and fill it with the proper fluid.
They didn't put a heavy gear oil (as used in the differentials) in it did they?

[ivrodriguezfx4]

Bindernut is not on the tranny that they put a different oil.It is on the tranfer case(4x4) thats my dilema? what kind of oil is it, like i said on the manual say it should be MERCON ATF but the dealer told me to use MERCON V. you know how it is dealers sometimes full around.

[Bindernut]

Yup...the transfer case also uses ATF. The latest Ford spec call for MerconV to be used in both the transfer case as well as in the transmission.

[glc]

Any ATF that meets Mercon specs is fine for the transfer case. Mercon, Mercon V, whatever. If anything else was used, get it changed. Have the shop show you a bottle of the stuff they used and read the label. If it's ATF and says Mercon on it anywhere, it's fine.