4.0 SOHC head gaskets/timing chains

[85_Ranger4x4]

You don't want your flywheel bolts to break off, that's for sure.

I don't understand their fascination with TTY bolts either. Sure you probably only need to buy them once or twice in the life of a truck...but still... it's just one more thing. I don't like that things are designed to be too expensive to fix or impossible to find parts for when they need repairs. Planned obsolescence at its best.

It is probably to encourage techs to replace them every time they pull a flexplate since per warranty they are probably supposed to replace them anyway... but nobody ever did until they were made single use.