2003-2004 Cobra Supercharger Belt Chart

2003-2004 Cobra Supercharger Belt Chart

2003-2004 Cobra Supercharger Belt Chart

Posted 3/28/2017 by Tyler Rodriquez


Have you just installed a new supercharger or idler pulley on your 03-04 Cobra and need a new belt? Check out our belt guide for the right info!

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LMR has put together this guide to help you decide which belt you need for most of the popular combos using a stock Eaton blower and multiple pulley combinations. Here are the breakdowns below explaining most of the possible combinations for the 03-04 Ford Mustang Cobra.


While we have determined that these lengths are the most accurate lengths needed, these belt suggestions should be used as a guide. Each recommendation should be within 0.5" of less of the ideal length. With differences in tension strengths, manufacturers, and OEM tolerances, variances in length can differ.

2003-2004 Cobra Supercharger Belt Guide
Pulley Setup - With Factory Eaton Supercharger 3.65" Stock Upper Pulley 3.00" Upper Pulley 2.90" Upper Pulley 2.80" Upper Pulley 2.76" Upper Pulley 2.70" Upper Pulley
Stock Lower Pulley 7.375" 75.50" 74.50" 74" 73.50" 73.50" 73.50"
2 lb. 8.0" Lower Pulley 77" 76.50" 76" 75.50" 75.50" 75.50"
4 lb. 8.6" Lower Pulley 78" 77.50" 77" 76.50" 76.50" 76.50"
6 lb. 9.10" Lower Pulley 79" 78.50" 78" 77.50" 77.50" 77.50"
8 lb. 9.50" Lower Pulley 80" 79.50" 79" 78.50" 78.50" 78.50"
10 lb. 10.0" Lower Pulley 81.50" 81" 80" 79.50" 79.50" 78.50"
Stock w/ 4 Piece Idler Kit 77" 75.50" 75.50" 75.50" 75.1" "

For those who are running a larger alternator pulley, follow the guidelines outlined by Metco.

  • METCO Auxilary Idler - Add 1"
  • 3.20" Alternator Pulley - Add 1"
  • 3.50" Alternator Pulley - Add 1.5"
  • 3.70" Alternator Pulley - Add 2"
  • Changing From 90mm Idler To 100mm Idler - Add .5"

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