My new HD OEM reman tranny requires Mercon V.

My transfer case uses Mercon III.

There is a gasket between the two when you split them.

Do they "exchange" fluid?

I don't want the Mercon III from the transfer case to get into the Mercon V in the transmission.

 

No, the transfer case and the tranny do not exchange fluids. They are independent of each other.

 

yeah there two seprate things but make sure you dont put the mercon v in the transfer case cant use it in there i was told when i just changed my tranny to oem hd one

 

Thanks for the info. I didn't think that it did, but I wanted to get confirmation.

 

There was never a Mercon III, only Mercon, and Mercon V. You can use Mercon V in the transfer case and the trans.

 

I used Mercon V in mine with no issues...