michael 13
Junior Member
- Joined
- May 6, 2013
- Posts
- 4
- Reaction score
- 2
- Ram Year
- 2013
- Engine
- Hemi 5.7
Ok, I am confused about the tow capability charts for the '13 1500 quad cab Long Horn 4x4. Looking at the one for iPhone/iPad.
It makes sense, up until you calculate the final ratios of the first few gears, which give the 8spd/3.21 combo, a significantly higher overall ratio down low than the 6 sod and 3.92s, at the time when I would figure for the torque requirement should be at its peak, and a lower overall/final ratio for better mpg.
Why is the max tow rating so poor for the 8spd/3.21 combo?
Is the axle ratio, really more important than the overall ratio, or am I missing something. Before looking it up, I figured that the 8spd/3.21 combo, would at least be the equivalent of the 6spd with 3.92s. The overall ratio starts significantly higher, than the 6spd 3.92 combo.
3.55 and 3.92 capacities are within 50# of each other for everything else being equal.
Makes me also wonder, why the axle ratio of those sets is so similar as well.
I would have figured the limiting factor would move on to something like breaks with the overall/final ratio being expanded. More torque available to get things moving, and I was expecting better mpg during towing from the lower 8th gear ratio.
It makes sense, up until you calculate the final ratios of the first few gears, which give the 8spd/3.21 combo, a significantly higher overall ratio down low than the 6 sod and 3.92s, at the time when I would figure for the torque requirement should be at its peak, and a lower overall/final ratio for better mpg.
Why is the max tow rating so poor for the 8spd/3.21 combo?
Is the axle ratio, really more important than the overall ratio, or am I missing something. Before looking it up, I figured that the 8spd/3.21 combo, would at least be the equivalent of the 6spd with 3.92s. The overall ratio starts significantly higher, than the 6spd 3.92 combo.
3.55 and 3.92 capacities are within 50# of each other for everything else being equal.
Makes me also wonder, why the axle ratio of those sets is so similar as well.
I would have figured the limiting factor would move on to something like breaks with the overall/final ratio being expanded. More torque available to get things moving, and I was expecting better mpg during towing from the lower 8th gear ratio.
