Viperpoker wrote:
CumminsDriver wrote:
I haven't seen it mentioned yet, but transmission gear ratios along with only having the 3.73 gears hurts the GM for the big tow ratings. The Allison has a 3.23 first gear compared to the Aisin with 3.72 I believe and the Fords 3.93 first gear. Throw in the 4.10 gears for the Ram and Ford and you have much better take off capability compared to the GM.
Rich
i think this answers my question as to why gm tow ratings are so much lower. combination of no 4:10 and the allison trans. that all makes sense.
It seams very reasonable Intel you think about the numbers. In 2016 the GM HD3500 dually was rated for pulling up to 23200 lb with an engine that made 765 lb ft of torque. In 2017 they increased the torque to 910 lb ft and yet the new 3500HD is still only rated for pulling 23300 lbs. You'd think if the limiting factor was putting torque to the rear wheels in low gear the new engine would have made an improvement in the tow rating. 910/765 x 23200 = 27600.
