Hey Guys, I was looking up replacement drive belts and pulleys and a upgrade came up. TSB Auto Zone says TSB 07-01-008 recommends changing from a 90mm idler pulley to a 76mm pulley and changing the belt from 88.75 to 88.00. I cant pull up Find the SIB to read it. Anyone ever heard of this. I'm not sure what originally drove dodge too have 2 different size pulleys but, originally it came standard with a 76mm pulley and my 4.7 had some option that required the bigger belt and pulley.

Thanks in advance.

 

Dodge uses a different format than what you are showing there...... Are there any alternate numbers on it?