With our Ford dually we found out that Ford beefs up the 350 SRW rear suspension with one stronger leaf spring, and it is not the same with the 350 DRW, in order to have same load capacity for both trucks, and as a result we had rear end drop with the DRW that changed the alignment of the two part drive shaft resulting in a slight shudder at start. Air bags became necessary, and stopped both the drop and shudder.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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