+1 The pictures indicate to me some sort of dust plug for the transmission. I know I had a similar piece on my torque convertor (auto tranny). It could also be a seal for a manual tranny, as Leon suggested. Let us know what kind of transmission you have.
FLASH = 98 V6, chrome yellow, black & blue accents, 146k daily driver POWER
: divorced exhaust with glasspacks; BBK CAI, TB, UDPs; (shift kit in the garage) STYLE
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