3rd Gen Engine and Drivetrain -> 2003-2007 5.9 liter Engine and drivetrain discussion only. PLEASE, NO HIGH PERFORMANCE DISCUSSION!

performance box??

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Old Mar 16, 2007 | 05:13 PM
  #1  
3500eh's Avatar
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From: medicine hat, alberta
performance box??

i raed some where in here that a good performance box will help a truck from being so hesistant. my 03 has no passing gear when doing 110km (80 miles i think). in town i have to floor her to get her a passing gear. tranny is best its been. rebuilt twice. any suggestions?
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Old Mar 16, 2007 | 06:55 PM
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From: Where hell freezes over.
At 80 MPH the transmission will not shift down because it's already at redline for 3rd gear.
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Old Mar 16, 2007 | 07:37 PM
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From: Ila georgia
You need a gear splitter o/d unit if you want a passing gear at 80.In the $4k range ought to get you a higher speed passing gear.
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Old Mar 16, 2007 | 08:43 PM
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From: medicine hat, alberta
thanks. what about in town? really have to stomp on her. i have 3500 with 250 low output. thats probably the prob, eh?
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