Safe RPMs in 5.3 '03 Yukon XL

[KMan420]

Upgraded TT to JayFeather series ~ 5.5K lbs fully loaded. Towed from Memphis to Orlando/Disney area and back. Terrain varied but mostly had to run at 3K+ to hold 65mph on even or slight upgrades and 70 was only possible going down hill. While I don't like running the engine that high I wonder if that is within normal tolerances and especially for a 15-hour session. For a long trip, what is the upper level of RPMs for the sake of the engine and/or the transmission?

[steved]

Upgraded TT to JayFeather series ~ 5.5K lbs fully loaded. Towed from Memphis to Orlando/Disney area and back. Terrain varied but mostly had to run at 3K+ to hold 65mph on even or slight upgrades and 70 was only possible going down hill. While I don't like running the engine that high I wonder if that is within normal tolerances and especially for a 15-hour session. For a long trip, what is the upper level of RPMs for the sake of the engine and/or the transmission?

I had about 6500#s behind my 2012 2500HD...it wanted to hold 5500RPM on the bigger hills to maintain 50mph, regardless of what I did. Coming from a low revving Cummins, this was a little unnerving to say the least. I was told for short durations, the higher RPMs are not detrimental. As long as your not at red line, it should be "within tolerance".

I would make sure your oil is fresh and coolant are topped off, if its going to be spinning that fast and towing hard; being up on the maintenance is mandatory.

[aloxdaddy99]

Did you see what your tranny temp was running? I think that is where I would be more worried. I think the only issue of running a higher RPM like that is the reduction in MPG's. X2 on what @steved said about fluid maint. if you work it harder than "normal usage" you should adjust your maint schedule

[ChevyHD]

The key to towing with your rig is watching your gauges granted they are all accurate. If you are going to spend any significant time towing, i would swap in a deep tranny oil pan and an after market tranny oil cooler. I would not be worried so much about your engine as much. I don't think you should be at 3k+ your entire trip though either. When in 4th and your tc locked, you should be able to cruise 65 without your engine wound out.