How heavy is TOO heavy? GVWR on a 2500
Alright guys I'd like your input on something I can't stop arguing both ways. Current rig is a lower mileage 2005 2500HD Duramax cew cab, motor has been gone through and added ARP studs, all new belts...
Forum Discussion
I towed an 11000 lb RV with an 03 tuned Duramax and felt it handled it fine.
Then I I towed the RV in my signature with the same 2003 Duramax. My GCVWR would have been very similar to yours. The truck had enough power. I was not concerned about being a little over the RAWR. I felt the truck was maxed out. The EGT reached 1400 on steep hills. On long down grades I would shift to low gear and the trailer would push the engine rpm up over 5000 rpm. I had over heating issues on long steep hills on hot days. I ended up burning out the transmission.
I upgraded my truck to a 2011 F350 SRW which isn't rated to tow any more than the GMC was. The difference in capability astounded me. The new truck handled the trailer absolutely fine.
I would say the limits of your truck are slightly exceeded and that the Allison is not up to the task of handling your trailer or a tuner on mountain grades.
Then I I towed the RV in my signature with the same 2003 Duramax. My GCVWR would have been very similar to yours. The truck had enough power. I was not concerned about being a little over the RAWR. I felt the truck was maxed out. The EGT reached 1400 on steep hills. On long down grades I would shift to low gear and the trailer would push the engine rpm up over 5000 rpm. I had over heating issues on long steep hills on hot days. I ended up burning out the transmission.
I upgraded my truck to a 2011 F350 SRW which isn't rated to tow any more than the GMC was. The difference in capability astounded me. The new truck handled the trailer absolutely fine.
I would say the limits of your truck are slightly exceeded and that the Allison is not up to the task of handling your trailer or a tuner on mountain grades.
