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Got my new truck all rigged for the trailer, now have a question please. It is recommended not to exceed 50mph for the first 500 miles when towing to continue breaking in the rear end with a load. I understand that they get pretty hot until wore in a bit. I have good intensions, but am short on patience, so expect to go from 50 (for awhile)) to 55 to 60 to 65 and then my usual 70 mph, probably in the first 100 miles. Anyway, what is the minimum RPM while towing 9,000 Lbs ? Stay in 4th or lug in 5th I guess is the question. Thank you and have a GREAT holiday season !
 

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Crash,

The rear end gets REALLY hot when it's new and being worked. Get it too hot and you will SUBSTANTIALLY reduce its life. It gets hotter the harder (faster) its works. I would STRONGLY recommend that you keep your shirt tucked in and keep the speed down. It's only 500 miles and only one day in the life of your truck. Your load is moderate and you don't mention if you're towing in the mountains but I wouldn't go over 60 and I would work up to that. Change the rear end fluid at 500 miles of towing and charge on. If you have a Mag-Hytek cover and a guage you can monitor the heat and adjust the speed accordingly.

I would put the truck in tow/haul mode and let the transmission work as it is designed. It will find the RPMS that are right for the load.

Good luck,
BobEdited by: Son of a gun
 
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