That's a relay for the TCS system.
It's emissions stuff.
Sometimes it was mounted there,sometimes they mounted it in the engine bay on the firewall.
Most likely a P/O got rid of it a long time ago.
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71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension.
Petrolia,Ontario,Canada but working in Port Huron,MI.
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