Ok... not a truck but still a ford:

1985 ford crown victoria... automatic ttranny with overdrive

Drives fine in all gears but overdrive. Overdrive works until everything warms up.

Then it acts like its in neutral when OD kicks in. Revvs and revvs... then eventually the OD kicks in and it goes fine until I slow down and it goes to a lower gear. Then the same thing again when going into OD. Only happens when its warmed up.

So... do you think that lucas transmission fixer fluid would help? Any "quick fix" to get OD to work when warm?

Thanks
Sal