Allison 4060HD Good Enough?

I would Google the transmission specs and look at the many chats that are related to that transmission.

I would post something in the chat but the admin may not like other chats from other places that are not the truckers report.

Grrrr.. on the auto correct on this phone.

 

I've been thinking of putting an Allison 4700 RDS in my next truck to haul 140,000 super b. Some off road, mostly highway. The 4700 has an extra low gear for start ability, but the rest may be similar to yours.
The only challenge I see is the jump from 4th to 5th in the 30-50 mph range. I tried it out with my 18 spd by skipping gears to match what the Allison would be doing. I have a 560 hp 1,850 tq DD15, it actually pulls it off just fine on a level road, I can see it could be a challenge on an incline with a cross wind.
RR Plett trucking in British Columbia has switched a lot of their fleet to Allison pulling tandems and tri-axles through the mountains. The one driver I talked to was pleased with it.
I suppose it depends on what rear ratio that truck has. A lot of them have something in the 5.06 plus range. I figured a 4.63 or 4.83 would work for me.

 

Not sure what model of Allison it is in this setup, but the video is neat......

https://www.youtube.com/watch?v=5svkrWrl-RM

 

It will do you just fine. Check out the rest of the videos on their youtube channel, plenty of companies with tractor trailers running the Allison with smaller power plants.

 

I had the opportunity to drive one across the country at 80,000 lbs. That truck had a 650 hp ISX 07 EPA engine with a 6 speed Allison behind it. The truck did good. They tend to run higher RPMs while crusing at interstate speeds which will in turn lower your fuel mileage. I was running 70mph with it so I will refrain from commenting on the mpg I got with it. The only thing I have an issue with is the engine brakes. The truck will downshift when ever you let off the throttle with the engine brakes on.