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GDE Trans Tune Options for shift schedule  RSS feed
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GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 350
Location: Southeast Michigan
Below is a link showing the GDE Fuel Economy Trans Tune shift schedule.

http://www.keepandshare.com/doc/2813701/gde-fuel-economy-trans-tune-shift-schedule-pdf-may-17-2011-3-33-pm-19k?da=y


Here is a link showing the GDE Towing Trans Tune shift schedule.

http://www.keepandshare.com/doc/2813702/gde-towing-trans-tune-shift-schedule-pdf-may-17-2011-3-33-pm-19k?da=y

The primary difference is the towing tune will hold 4th gear until 70mph (2280 engine rpm) and then upshift to 5th gear. Using 4th gear between 50-70mph while towing loads over 2500lb. is beneficial for holding gear while traversing hills and it also keeps the engine rpm in the most efficient torque zone to reduce the tendency for gear hunting.

In extreme towing conditions it is still recommended to turn off the O/D and tow in 3rd gear. This will keep the engine rpm higher to maximize coolant flow through the radiator and spinning the mechanical fan faster to increase the air flow across the radiator.
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