Forum Discussion
ggardne2
Apr 17, 2018Explorer
A 1988 5.0L is most likely not a C6 ... the C6 (which is a 3 speed automatic) was not commonly used on the 5.0L as it is a larger, higher torque capacity transmission that was more commonly used on the 5.8L, 7.5L, 6.9L and 7.3L diesels, and on the 4.9L I6. I suspect your van has an AOD which is a 4 speed automatic overdrive transmission. Regardless of a C6 or an AOD I would usee Mercon V fluid in your transmission.
The AOD never used type F and the C6 did not use type F after 1977 so do not use Type F in your van.
The AOD never used type F and the C6 did not use type F after 1977 so do not use Type F in your van.
About Motorhome Group
38,766 PostsLatest Activity: Jan 10, 2026