Quote:
Originally Posted by firebird_1252
i'm sorry but a bit confused. so 2.64's above 60 would be good. 2.93 below?
these trucks have 10speeds in them.
i'm looking at single turbo c15's or isx's.
i thought this would be a good topic.
|
The lower the gear ratio the faster you can go and be in your sweet spot.
Yes, they are 10 speed direct drives. Check to be sure, but I'm almost positive.
You can operate a Cat engine at lower rpms and it will pull well. I have 3:55 rears, a double overdrive, with a final of .73. At 57 I am turning 1225 rpm. For most engines this is a little low, but my Cat will pull down to arround 1000 rpm. Just because it will doesn't mean I do regularly. My sweet spot is about 1350-1375, but my range is pretty broad, 1000 to 1500 rpms.
Can I assume this Cat is 2003 or earlier, a pre ACERT with a serial number of 6ZN? If so this is probably the best Cat out there. It will get the best fuel mileage of all Cats and being pre ACERT, relatively, maintenance free.