Posted by AAA on Friday, March 26, 2004 at 3:48PM :
In Reply to: Re: Fred - posted by Fred Coldwell on Friday, March 26, 2004 at 3:27PM :
Hi Fred -
my#s show :
9.00 x 16 (36"):
60 mph and 80% OD = 2188
65 mph and 80% OD = 2370
11.00 x 16 (38.5")
60 mph and 80% OD = 2046
65 mph and 80% OD = 2216
My personal experience - 98 Ram 2500 4x4 3.55s 32-33" tires is turning 2100 rpms at 70 mph / avg 19 mpg.
Perkins W300CC with 4.88s 11.00 x 16 and 4th direct is pushing the rpms to 2600-2700 at 62 mph. Feels fine at 60mph, I have run it for hours at 60 mph, noisy, but not horrible / avg 17 mpg.
I would be comfortable with installing a Cummins in a W300 with 4.88s, as long as an od trans is used, and preferably 38" tires.