Anthi4078 Posted September 23, 2022 Share Posted September 23, 2022 Hey I’m about to buy a new belt for my 1987 4.0 without AC. There is a belt listed for no AC and it’s 73.03” and the belt with AC is 102.56. I’m wondering what is the proper belt since there is a idler where the AC compressor would go so I don’t see why the length would change. Thanks Link to comment Share on other sites More sharing options...
cruiser54 Posted September 23, 2022 Share Posted September 23, 2022 Run a string around the pulleys and measure it. Good starting point. Link to comment Share on other sites More sharing options...
velco Posted September 23, 2022 Share Posted September 23, 2022 102.56 with the idler is the proper length. Link to comment Share on other sites More sharing options...
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