Tow/haul mode on a 04.5-05 doesn’t allow you to stay locked into 3rd gear. I had to wire up the BD overdrive lockout which gave me this feature. It’s worth the investment, plus a kick up switch.
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Nick J
'14 Silverado LTZ 5.3 4wd
'05 Cummins QCSB 4wd 48re
'91 Cummins w350 5spd
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