New truck specs opinions

I would personally go with the X15, 10 speed and a 3.70 rear ratio. If I’m not mistaken you should do 24.5 tires to keep your 5th wheel height at 52”. Keeps the tankers more level.

 

Get rid of that 3.08 axle.........

if your doing city work at 80k you aren’t going to save fuel with it anyways....

You can raise the 5th wheel to get the height you need . Keep the 13L and 22.5 rubber to save tare weight.

The auto I could do without, but that’s your choice.....

 

I know you said you didn’t want to get into the new vs used debate but here’s my two cents.

With only 10 miles of highway driving a few times a day I can guarantee you’re going to have dpf system issues. That’s not enough time to burn off the dpf which is typical done at highway speed.

We used a road tractor with an emissions system to shuttle trailers from a holding yard to a plant 6-8 times a day one mile each way. We had to do parked Regens every single day.

 

Brand...get the one with the dealer that gives the best service in your area.
Engine....either a 13L or a 11L but do NOT get a 15L.
With the work you described,i would get a MX11.(i own one)

Might think about getting a pusher or tag axle instead off a twinscrew.
Will save weight and if you make it a lift,save tirewear.

Get the longest warranties you can.
@Belials can advise you on those.

 

Both Cummins & Paccar offer comparable warranties for similar prices.

If you have a great Peterbilt / Kenworth dealer in the area who can properly service a MX and that's what you are leaning towards - go for one. The warranties are great and Peterbilt is good at taking care of their customers.

If you don't have a great Peterbilt / Kenworth dealer who can service a MX, you may want to consider a Cummins. Again, the warranties are great but in my opinion their customer service isn't as great.

 

City work and limited highway. I’d go with the MX11 and an Allison TC10. Peterbilt has it as an option. For the amount of stop and go you’ll have, an Allison would beat an AMT by a long shot. I’d gear for a top gear cruising rpm at 60mph, 1350 rpm or so. A TC10 and 3.08 would give you 1369 at 60 mph. That truck won’t be at that speed much anyway.

 

I would reconsider a slightly higher number on the ring gear if you wont be doing much freeway speeds. And i would get the automatic.

I know... flame away my fellow truckers and tout the 13 and 18. My new 2019 12 speed auto... is a royal pain. It gets better fuel mileage out of the box than i was getting with my last truck, a 2015 gone at 560k.

Its not beating me and broken in old truck by a little... it is killing it out of the box by almost a mile per gallon.
It hits every gear loaded... and skip shifts empty to the perfect gear everytime.

It will likely save 17k annually in fuel.

 

I’d say just keep in mind if buying a new truck you might not do the same job with it forever. Try to aim for as much flexibility as possible.

Engine I’d go Cummins X15 100% and same with Endurant 12 speed auto. That combo works extremely good.