MIne used to do it a lot I couldn't find anything wrong with the pulleys either and eventually it was replacing the belt that fixed it. Seems it was just a bit too worn to grip well enough at high revs with the wheels turned
Oh well, single belt setup fixed it better lol
Proud TQE Operator and President of SEFAG - the Society for the Elimination of Ford Automatic Gearboxes
Pacemaker headers + 2.5" exhaust
EF Fairmont interior
Lowered King springs
5 speed manual
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