Question for the knowledge base. I have a 20 3500 longbed, HO Aisen, 3.73 rear end, my brother has a 2021 5500 w/ 4.44 rear end, only comes with std output and an Aisin, I think it is the only option in a 5500. Anyway, my trailer is about 13000lbs, his is closer to 20000lbs. Typically tow at 65mph, going up long hills my 3500 holds speed, his 5500 drops at least 10-15 mph Any ideas why his 5500 can’t keep up with my 3500? I understand he is heavier, but thought he could keep up.
Thanks
Thanks