Quote:
Originally Posted by Thanos
Tow/haul causes the trans to not shift into 4th and allows for the engine to rev higher before shifts, you NEVER tow in OD. I have 2500 HD with a allison they say DO NOT TOW IN OD. My suburban with a 4l80e would never shift into 4th when tow/haul mode is on.
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I have towed using 10+ vehicles with 4L80e's, and not one of them prevents the shift into overdrive with tow/haul mode activated. Every one of them dropped temp vs staying in 3rd.
Also towed with several different d-max's with both the 5 and 6 speed alison, and again they all shift into overdrive even with the tow/haul mode activated.
Also towed with a couple 2015 dodge cummins with their new 6 speed, and they both go straight into OD with tow/haul mode activated.
The old 95 dodge cummins my brother has is the only one that doesn't shift into OD with tow/haul activated.