Riffraff Diesel Technical Knowledge Center

Top 10 4R100 Problems 7.3 Owners Should Fix Before Towing Season

Top 10 4R100 Problems 7.3 Owners Should Fix Before Towing Season

Posted by Adam Blattenberg on Jun 17th 2026

The 7.3L Powerstroke will usually drag the trailer wherever you point it. The 4R100 however, needs a little more respect. It is not a bad transmission by any means, but heat, old fluid, weak cooler ca … read more