Cm871 vs 2250/2350

[Rawze]

(01-31-2017 )Rockycoon75 Wrote:  I'm truck shopping and have a few options. I'm really after a 09 kw with a cm871 with fresh cummins overhaul. It has 600 miles but it may already be sold. Next to options are a 2010 with a cm871 with 420k still a Virgin. The 3rd option is a 12 with a 2250/2350 (don't know enough about them to know the difference) with 550k on it. Not sure which motor is a better one. Going to be pulling hopper 80k+ in the mid west and south east. Pretty similar specs otherwise. Thanks.

As important as the engine, you should be looking real close at rear end ratios. pulling a constant 80k all day long really sucks with 3.36's, worse with 2.79's, etc. You need 3.79's or higher or a minimum of 3.55's.

Too high rear ratios and all your going to do is work the engine to death, complain you need more power, and wonder why you need an inframe sooner than expected.