Correct painted black rear deferential.
That's differential, not deferential. Deferential is an adjective meaning 'respectful.'
Differential is a noun name for the set of gears that allows a vehicle's drive wheels to turn at different speeds going around a corner.
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[URL=https://forums.fordthunderbirdforum.com/thunderbird-photos/photos/deferential.2739/]Deferential[/URL] by [URL=https://forums.fordthunderbirdforum.com/thunderbird-photos/authors/icon-56.10892/]ICON 56[/URL] on Ford Thunderbird forum covering all models 1955-2005