It is 3 years younger than my '03.
(which happens to be a DRW Chassis/cab, with after market aluminum flat bed)
Since I only have about 150,000 miles on that it may be too early to tell.
I really like the Allison trans, maybe I should say I like its tow/haul algorithm.
I had a front wheel speed sensor go out, which caused some WEIRD symptoms.
To the ABS that represented a locked up brake, so it would divert all pressure FROM that wheel and pulse the pedal to let me know, although this only happened at just about walking speed. It ate out the other front brake.
Since I tow horses around I drive in a style that rarely requires braking - at all and just about never requires HARD braking.
Bottom line; RockAuto parts mail order, two whole hubs, disks, pads, etc. a simple enough DIY project with normal hand tools.
It is my understanding that it would have been a near $2K job if it had gone in the shop.
Other than that, driver side window regulator went out a month ago, again simple DIY about $100 at Autozone.
An aside on this; while I had the door apart I noticed that despite 8 years in New England and a lot of road salt there is NO RUST inside the door - LIKE NEW !!!
Yes, we DO drive horses around in the winter time, indoor shows, vet runs, etc.
BTW, I'm not totally convinced that this has made any HUGE difference, but in my new truck owner enthusiasm I fitted the trans with a bigger/deeper oil pan.
It was the "to do thing" on the truck forums at the time, the rationale being that more fluid takes longer to heat up on long climbs when loaded, so you have a better chance of reaching the downgrade and cooling it before it gets way too hot. Most of the extra capacity is lower, i.e. better exposed to the air stream under the truck.
Since I haul as many as 6 horses at a time it seemed like a good idea.
This is a standard GM steel pan that is used on the same trans in a different vehicle, so it was quite cheap and doesn't seem to reduce ground clearance "significantly".
I also switched to Synthetic trans oil.
What else ???
Mine has the DIC (driver info center) with independent displays of Trip Miles, Gallons, MPH Avg & MPG Avg for "Business" and "Pleasure". I use the "Business" set for towing.
After correcting for actual gallons used and miles traveled.
14.6 towing a 39 ft head to head horse trailer.
18.7 without the trailer.
In all fairness this truck rarely goes anywhere without horses, e.g. occasional couch moves, to the inspection station for its annual sticker, etc., not much else.
I am confident that this is a 20+ MPG truck when unhooked - - and on trips over 5 miles (-:
