Dyno with a Auto.
 

I have a 2001 dodge Cummins with a rebuilt Auto. transmission. I was wondering if you can dyno trucks with a Auto transmission in it. I have looked on youtube and all of the are 5 or 6 speeds. Thanks

Yes you can, itsdone quite often. A tc lockup switch will help as it will make it direct drive in. 3rd and keep OD off. With TC locked in 3rd it wont downshift in to second when you roll into it.

yes it can be done , it is done in the past quite many times , just find the right person and right equipments to get it done in better way.