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How to Install SR Performance Underdrive Pulleys - Polished on your Mustang

Installation Time

2 hours

American Muscle
Shop Parts in this Guide

Installation Instructions for SR Performance Underdrive Pulley System (94-98 3.8L V6)


Note: This pulley system will require a new serpentine belt. The stock belt is 98.75” and will be too long after installing your underdrive pulleys. Purchase a 6 rib 96” belt before installation.


Step 1:
With the belt still installed on the engine, loosen the four crankshaft pulley attachment bolts, but do not remove the pulley. Using an air impact wrench, loosen the alternator pulley nut, but do not remove the pulley.


Step 2:
Release tension on the belt and remove it from the engine. With the belt removed, remove the four crankshaft pulley bolts and alternator pulley nut and remove both pulleys from the engine.


Step 3:
Install the new pulleys in place of the old, tightening the fasteners just enough to keep them from moving around.


Step 4:
Install your new belt following the factory routing diagram and tighten pulley fasteners to factory specifications.


Start the car and make sure the belt is tracking on the pulleys properly and that there is not excess slack in the belt. This completes the installation of your SR Performance Underdrive Pulley System.

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