X15

[tsolson]

(09-03-2023 )Rawze Wrote:  ...
Go ahead and try to find a newer model mid-tier truck with an X15 in it and a decent set of rears, 3.55's (or better yet, 3.79's maybe 3,90's) + a manual 13-speed (or 10-speed) tranny in it that has been well cared for those first half-million miles.
Here is he typical scenario: http://rawze.com/forums/showthread.php?t...2#pid37802

It’s definitely hard to find anything with proper rear diff ratios. The first truck I looked at had 2.60 rears and I had to ask twice cause I thought I heard him wrong. Lol

I have a couple 2018 Kenworth’s I’m going to look at tomorrow that have X15 and 3.91 rears, 18 speed manual trans. They have around 400,000 miles. From what I’m reading here, I’ll definitely need to replace the fuel pump or plan to asap if I buy one? I knew the previous models were bad, but I assumed they had hopefully fixed the issue with the newer engine. Anything else that I need to watch for ?