Changing my front and rear fluid diff.
Using mobile 1 synthetic gear lube LS 75w-140 for rear. Can I use 75w-140 in front as well or should I go to 75w-90 in front.
I drive 2004 f150 fx4 with 6inch lift and 35inch wheels.
Thanks for your help.

 

I would not recommend using the LS for the front diff.

 

Tech, can I use 75w-140 in front or should I go with 75w-90

 

I believe it's 75-90 for the front... 2 quarts if I remember right.