Excuse me brflg, but doesn't the V6 '91 have 3 v-belts, rather than a serpentine?? Similar to that of the 4-cyl
You will need to have a 3/8 drive ratchet or breaker bar to place into the idler pulley slot that is rectangular. Apply pressure to the wrench in the direction to relieve the belt tension. Slip the belt off of one of the pulleys and gently release the idler tensioner. There should be a map that shows you the belt routing on the front cowl. If you do not see it remember the belt routing as you remove it so you can replace it correctly. If it is a serpentine belt make sure the ribs of the belt are seated in all the pulleys before starting the truck.
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