doing rear diff what fluid do i need to use door code is 42 2001 sport trac

[dinks07]

doing rear diff what fluid do i need to use door code is 42 on my 2001 sport trac 2wd also do i need friction modifier

 

[dinks07]

no one knows

 

[drdoom]

Code 42 is conventional, so no friction additive. Look in your owner's manual for the proper viscosity.