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1987-93 Fox Body Mustang Under-drive Pulleys Installation Instructions

Check out our step by step guide to unleash hidden HP in your 1987-93 Fox Body Mustang!

Tools Needed:

  • Common Tool Box Tools
  • Impact

Install Time:

Approximately 1 Hour 30 Mins

Difficulty:

3 out of 5
Step 1:
Disconnect the negative battery terminal.
Step 2:
Loosen the bolts on the water pump and crank pulleys
How To Install Fox Body Underdrive Pulleys - How To Install Fox Body Underdrive Pulleys
Step 3:
Remove the serpentine belt by shifting the adjuster to the passenger side.
Step 4:
Remove the bolts from the water pump and crank pulleys the rest of the way and remove the stock pulleys.
Step 5:
Install the BBK under-drive pulleys to the water pump and vibration dampener using the stock bolts.
How To Install Fox Body Underdrive Pulleys - How To Install Fox Body Underdrive Pulleys
How To Install Fox Body Underdrive Pulleys - How To Install Fox Body Underdrive Pulleys
Step 6:
Remove the alternator mounting bolts, lift the alternator out of its cradle to access the pulley. Using an impact, remove the stock pulley and install the BBK Pulley. Re-use the stock nut and/or washer.
How To Install Fox Body Underdrive Pulleys - How To Install Fox Body Underdrive Pulleys
Step 7:
Re-install the alternator and mounting bolts then tighten.
Step 8:
Inspect the serpentine belt for wear. Unless recently replaced, BBK highly recommends the purchase of a new serpentine belt to compliment the new pulleys, and install.
Step 9:
With the serpentine belt on, tighten the water pump and crank pulley bolts.
Step 10:
Check that the serpentine belt is properly seated on all the pulleys, Insure the tensioner arrow is within the indicator marks on the tensioner. If adjustment is required, relax the tensioner from the belt, loosen the upper 9/16” hex alternator mounting bolt, shift the alternator towards the air cleaner or allow it to move in as required within the clearance of the diameters. Tighten while holding the alternator.

The Under-drive Pulley Kit is designed to increase power by reducing the overall speed of the serpentine system and should in no way create a charging or cooling problem. However, an inspection of the fan clutch, thermostat, and radiator should be performed to insure proper operation.
Vehicles equipped with high amperage drawing stereo systems should check charging effectiveness before installation of the Underdrive Pulleys.

Installation Instructions Provided By BBK Performance