Trucks & Trailers - Chevy w/auto/manual transmission
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eddy2419
01-18-2010, 06:57 PM
I just got an 09 1/2 ton crew with 5.3 liter. It has the manual shift option. I have yet to tow with it. I read the manual but how is this feature best used towing my 6000# boat? Get to speed in auto then manage shifts on hills with the manual mode?
mike343
01-18-2010, 07:40 PM
Just what you said, but after gettingup to speed I'd keep it out of overdrive. You haven't said what the diff ratio is but most of the new GM's are pretty low--even 3.24. I would not tow at highway speeds under 2000 rpm. Too much chance of lugging up small hills. I have an older Tahoe (4sp) that runs fine at 2400 rpm at 60 mph (12.5 mpg towing 5700 lbs) Goes up 3% grades w/o downshifting. Without driving one of the new six speeds with low ratio rear ends I don't have much knowledge. But if I had to tow in fourth--first gear below direct drive--I'm not sure I'd be happy.
eddy2419
01-18-2010, 08:29 PM
Thanks for the reply! I will see what it takes o keep over 2000RPM's. I don't know what the differential is, didn't know enough to ask. It did come with an electric brake controller so it was set up for towing.