Took the plunge - Cummins to Hemi 6.4
After reading posts, reviews, specs, watching videos, and a few test drives, I finally decided to take the plunge. I sold my 2003 Ram 2500 QC LB 4x4 Standard output 5.9 Cummins 5 speed and bought a ne...
Forum Discussion
blderman wrote:
Here is a brief example based on trans/rear end gear ratios. I know this isn't proof of anything but it shows the design flaw, in my opinion.
Ram 6.4 (420ft lbs @ 4000 rpm)
1st Gear 3.23= 1,356 ft.lbs x 4.10 rear= 5,559 ft.lbs
2nd Gear 1.84= 772 ft.lbs x 4.10 rear= 3,165 ft.lbs
Chevy 6.0 (380ft.lbs @ 4200rpm)
1st Gear 4.03= 1,531 ft.lbs x 4.10 rear= 6,277 ft.lbs
2nd Gear 2.36= 896 ft.lbs x 4.10 rear= 3,673 ft.lbs
So mathematically speaking the Chevy has 718 ft.lbs more in 1st gear and 508 ft.lbs more in 2nd gear. If my math is correct that is a substantial difference in torque to the rear wheels. If the Ram had the same gear ratios as the Chevy it would have walked away easily.
LOL! So how do you explain the Chevy going up the Ike in second gear? It only shifted into first just before the top of the mountain.
Face it, the Ram 6.4 is all paper #'s and was beat by a engine trans combo that was put into these trucks back in 07.
