Can I put an 18spd in place of my 10 spd on my paccar 13?

I believe they can’t raise the torque but can uprate to 485 hp same torque though. The 500 hp from those years use a bigger turbo. Seeing that your Canadian I’d talk to diesel spec out of Montreal about a non factory safe tune .

 

Turn the fuel rail pressure up to 16lbs, speed up,don’t know max torque on Paccar, I’d say you could go to 1600-1650
Most wont max them.

 

You're maxed out by the looks of it.

 

A 13 speed will be more drivable because you can split the gears. Since it’s out of warranty I’d just find a place and see if they’ll put the 510/1850 tune in it.

 

Check the torque rating on the trans.. most are 1,800. If so the max you can go is 1,750.

 

If they turn up to 1850 they'll probably just sign a waiver saying it's on him if something goes boom

 

To turn up through a dealership they have to send a request to another country who only goes by turbo and transmission specs . That’s why I recommended aftermarket through a known good company. 18 speed or 13 speed will only make a noticeable difference in top few gears. Being Canadian he probably hauls 100,000 lbs or 87000 lbs if a tandem.

 

Using a desktop computer. Had to reorient the picture.