2013 Kenworth T660

[Waterloo]

(02-09-2019 )Explosia Wrote:  

(02-08-2019 )flatbed94kid Wrote:  is the liner fretting bc he has that low of a gear ratio where all the gears would be turning even faster then say 3.90 rears?
What is your ratio on your truck Rawze?

Also my oil pressure gets lower when I idle and then goes up when I am driving or I rev the engine.

He’s saying running in the top gear at 60-65 will turn too low of an rpm, lugging the engine, causing vibration, thus fretting liners. I have read up in this because I have one of those spec’d to abuse the engine in the lower RPM range trucks he’s talking about. I always run in a lower gear, keeping me in the 1400 and up range. I’ll put it in overdrive sometimes if I’m light and out west on flat ground. If this were my old early 90’s outlaw days I have have a bad ass triple digit truck the way this is geared. I could put it in the big hole at 80+ mph lol.

Like JMBT says, a truck with 3.55 rears is the the ratio you want if your a 65 mph guy.

You do need to know how to drive it. I love my 18 speed, because I can split those gears to find the right RPM to match the conditions. But, I have to agree with Rawze, the 18 and combined with the 3:42's will tear up the liners if you get lazy on the shifts or ride around in top gear at 55 mph.

And when I do my boxes, I am doing a gear swap. The 3:42's are going bye bye.