ripping r
Old&Grumpy
first i have heard of this.Here's another thought....
My understanding is that from 18 on, there was an option on the rear differential. Some were heavier 6500 lb axles like mine....but other 2500s got the lighter 6000 lb rear axle.
Could be that trucks with the heavier axle get the damper? Probably is due to some other reason, but it's a thought anyway.