The conservative answer is keep it in 4th. The real world answer is you can watch the trany temp gauge and if it doesn't go up you are OK. BTW wave as you go by and don't speed around the Wilcox Road Exit (#53) in AL.
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Hard to say, but from someone who tows 90% of the time with my titan with weights from 4K to 9K heres how I judge use of 5th when towing.
If in 5th you can pick up speed without downshifting then I would say you will likely be ok.
In other words if your rig can easily pull the load then you'll be ok, but youll have to downshift at the first thought -whiff of a hill. If you cant pick up rpm in 5th then just stick to 4th, your transmission will be a lot happier.
Once the temp starts climbing you are taking life off your oil and transmission.
I do a simple drain and fill of the trans every 7500-10K.
Uncle Dave
If in 5th you can pick up speed without downshifting then I would say you will likely be ok.
In other words if your rig can easily pull the load then you'll be ok, but youll have to downshift at the first thought -whiff of a hill. If you cant pick up rpm in 5th then just stick to 4th, your transmission will be a lot happier.
Once the temp starts climbing you are taking life off your oil and transmission.
I do a simple drain and fill of the trans every 7500-10K.
Uncle Dave
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