Just got back from picking up a load of 1/3/4 .083 CM tubing, to get ready for the ECTA , we are doing the bar to NHRA spec, will have a 1 3/4 hoop behind the driver with a 1 3/4 hoop behind the rear seat up to the window level . Talked to NHRA several times this week, and working out a few ways to do this.
In these trucks, or any car, if you installing a roll bar, the tubing shall be 1 ¾ .110, mild steel or .083 CM. With the exception of the bar behind the seat. If you chose to do a complete cage then you can use 1.5/8 tubing. I think you need to step up to the larger tubing in this heavy of a vehicle. In any case Project X Diesel is ready for the standing mile. We found out that we will have to run A/DT, because we have a turbo charger, this is requiring us to run two classes higher then the C/DT class a 5.9 Cummins is sized for