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I know this MAY seem overly simple, but with the engine running, spray the belt and the pulley surfaces with WD40. Sometimes the grooves on the pulleys get some surface rust in between them and the lube from the WD40 may take it away. The reason it does it under a load, is due to more strain on the belt, which in turn may make it slip and cause the squeal. The WD40 will not cause it slip out of control, but it provides just enough lube to make the sound go away.
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1991 FORMULA 350-GONE BUT NOT FORGOTTEN
1 of 1,197 with L98 Option/13.79@100 mph
1994 25th ANNIVERSARY TRANS AM GT -1 of ONLY 2,000 made/ Only 128 made with a HURST 6-Speed Manual and 91 with T-Tops and Compact Disc/ K & N Filtercharger/Magnaflow Performance Muffler/Air Foil- ORIGINAL MINT Arctic White Ultra Rare SURVIVOR. DAYTONA 500 PACE CAR Decal Kit!
SOLD: 1989 Turbo T/A in 1991 it ran 12:18@115 mph
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