I got the rear diff rebuild 3000 miles ago . The builder running some OREILLY 80w90 . I want to flush it and change to synthetic . I think the factory call for 75w90 . But dint ford switch over to 75w140 on all their 8.8 diff ? Thanks
My fluid choice either Mobil 1 or valvoline . Just need to know which weight.
My fluid choice either Mobil 1 or valvoline . Just need to know which weight.