Originally Posted By: lawman1909
Off topic I know, but you should try MC synthetic blend 5w-20 in the CV. We use that exclusively in our squads and change every 4K. That 4k could be 6-7k if the cars weren't idled as much and weren't doing near redline runs every day for calls.
Thanks for the tip! Everything I have read about Motorcraft oils here on BITOG is nothing but positive. It is really a great oil for a great price.
In the CVLX its about 1800RPM with 2.73s and larger 255/45R18 tires.
Its going to get 4.10s here in a month or so. It would bring it up to about 2600RPM.
The CVPI also has 3.27s as your '09 so it is the same 2000RPM.
'13 F150 3.73 gears, six speed auto and 265/70R17 GY Duratracs - 1800 RPM @ 60 MPH.
'08 F150 3.73 gears, four speed auto and 265/70R17 GY Duratracs - 2000 RPM @ 60 MPH. Most of the RPM difference is because of the Detroit Locker (loose backlash).