The 2013 was a great strong and good looking truck and I would have still had it today if it wasn't for the CP4 fuel pump. As long as I had it I kept it under warranty including an aftermarket GM one. While this would have covered a failure it just was another thing that drove the cost of ownership up.
Plus I specifically used this vehicle for towing my camper. A failure on the road while out with the family would have been catastropic and left me stranded. I opted to trade it off an pick up a 2019 L5P as I really wanted the tried and true real Allison and not the GM branded.
I really enjoy the improved updated look of the 2019. One of the best issues the that GM dumped that fricking exploding CP4 pump. I no long have to carry an extended warranty that I needed on the 2013.
My driving impressions between the 2013 and 2019 is that in its stock form the 2013 had better out of the hole performance but had a higher engine noise level. Apparently GM either added more sound deadening on the 2019 or that the L5P is generally less noisy. The Crew cab seems to ride a bit better then the 13's extended cab but its a bitch to park. I initially was going to buy a 2020 but couldn't get past the butt fugly front grill thus causing me to consider the Denali. The clincher was did I not want the GM 10 speed transmission and after much research I found I could not order the tried and true 6 speed Allison even though the dealer tried hard to talk me into it.
When it was all said and that was one thing to this day I thank god I didn't fall for was for that damn "Branded Allison/Ford" Transmission. Much like the old CP4 pump a thorn in so many's side now!
Whats in the future? When the new Allison 9 speed debuts in the new Dodge I will probably jump off the GM train and order a new Dodge. I have always thought that the Cummins was a better engine and for many years rated superior when it comes to towing. Teamed with aGenuine Allison 9 speed it's a winning combination that GM will see many brand loyal jump ship for me included.