9 Speed manual with a Cummins ISX15 450HP

Personally I would never choose a 9 speed with a 15L anything. Depending on the gear ratio to get good mileage on the top end......the low side is just not low enough with a load. Always feels like you have to slip the clutch to get er rolling.

10 speed minimum I say. If the 9 is a killer deal that's proly why? Convertable to a 13 would be your best chance at a good deal?

 

You can convert it to a 13 easy enough.

Depending on what you plan on doing with it. If it's your first truck and the price is right, just baby it until you get some money coming in.

 

What rear end ratio?

 

Black pete 579..
Ain't that how tmc specs there fleet.?

& I'll take a 9 over a 10 anyday of the week. My truck can get rolling in 2nd or 3rd with no throttle 90% of time unless I'm on a grade.. The 9 should have a deeper overdrive @.73 vs .74 for most 10's..

 

Yeah but you've only got half a truck

 

LoL 10-4.
But..., don't you think an isx, even fleet spec is around 1650tq..? Its gotta have more tq at idle vs. my 1250tq detroit.. Right..?

The thing should get rolling fine, even if he has to use 1st. And if all else fails, put'er in the granny.

 

That's an east and west truck. If you're gonna roam around my neck of the woods, convert it to a 13.