The 3.43 Rear end
I have a 07 Dodge and have a 3.73 rear end. I am thinking of trading it for a 2013/14 and have been told that I would get better gas mileage with the 3.43 rear end. I am towing a 14,000 lb 5th wheel...
Forum Discussion
bimbert84 wrote:4x4ord wrote:So 4x4ord worked out the numbers for this particular combination, and I agree the 3.42 looks ideal. At 70mph, you have 3 useful gears, 4th-6th. Drop your speed back to 60mph or so, and you pick up 3rd gear, which provides 34% more torque than 4th gear.The Aisin coupled to a 3.42 provides the following speeds at 1700 - 2900rpm:
3rd ...... 35 - 60 mph
4th ...... 47 - 80 mph
5th ...... 61 - 104 mph
6th gear at 1366 rpm will provide a cruising speed of 60 mph.
For comparison, 2900 RPM in 3rd gear with 3.73s would put you at about 55mph. With 4.10s, about 50mph.
-- Rob
I think I am about 2,900 in 3rd at 55mph with 3:42 gears. I pull 6% grades at that speed and rpm.
