Tow/haul mode

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caw_86

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I have a 1998 k1500 and was wondering if I could add the tow/haul mode that gmt800 trucks have? If someone has done it, has it been beneficial?
You need to 411 swap to do it i believe, but you have no indication if its on or not
 

99xcss4

92g-94c frank'n (truburban) K-2500
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