2014 isx vibration

[in2trux]

(03-06-2016 )race7820000 Wrote:  carrier bearing is good. going to cummins tomm and going to have them mess with the timing and ecm to see if that helps

I'd go back and double check that carrier bearing. I had a similar problem. I always check it when I grease the truck and it got past me. If it is even slightly cocked it can give you that kind of vibration.
Once I changed the carrier bearing it went away. If the shafts aren't indexed right you can also get vibration by it being a couple of teeth out. Check that bearing is at right angle an not pitched forward or backwards. Mine was still tight but the rubber bushing was torqued about 5 degrees. Pinion nut is one time use only. Also might check that any balancing weights haven't been thrown .

I would still follow the other suggestions on timing.