Ram 2500 6.4 Hemi. 3:73 or 4:10?
I just posted what I'm planning to buy, but would like some real world opinions on what gearing you have and how you like it. Right now, I'm looking for something to pull a 21" Ragen TH with a GVW of...
Forum Discussion
ib516 wrote:
The 4.10 are better in the Ram due to the fact that the ratios in the 66RFE trans are different than the competition. If you actually look at the overall ratios, 4.10 in the Ram is closer to the 3.73 in the Ford in first through third gears. Google the transmission ratios for each, you'll see what I mean.
Bingo.
Rear axle ratio must be matched with transmission internal ratios. The 66RE has I believe a 3.2:1 1st gear, compared to near 4.0:1 for GM/Ford. In this case, the steeper the rear axle the better.
On the other hand, I chose 3.21 on my 1500 because the ZF has a super deep 4.7:1 first gear.
I hate it when magazine talk about a 3.73 vs a 4.10 vs this and that without ever considering the transmission itself.
