I'm interested in buying an 07 ram 2500 qc 4x4 with 35 inch tires and 3.73 diff gears. What is the the gas mileage estimate with the 3.73 vs. 4.10? Should I switch to the 4.10 gears? I do 70/30 city/hwy driving.

 

I forgot to mention it has the 5.9L

 

there is more than enough torque to get you going. mpg will suffer some but is it a good justification for a gear swap? That wyould be up to you to determine. if your towing then yes, it'll pay for itself quicker.

I have 33's with the 3.73's and it's fine. mpg suffered approx 3 mpg when I put them on... mainly for 2 reasons, height & weight. rotational mass was increased significantly from stock.

The gear swap $ would be approx $1600 bux (that was my estimate when I inquired).

 

That is the set up that I have on my truck. Performance wise I noticed no substantial differance. I may have lost a little mileage but it's a work truck. By the way I tow 14,000 lbs fairly regularly and I have never considered a gear swap It works fine.

 

I was told for my 2nd gen 500-800 per axle.

 

I have an 06 with 35's and 3.73 tow anywhere from 2ton - 8 ton, drive 70 to 100 mi a day and am averaging 15-20 mpg (hand calculated)

 

While the increased size and weight may negatively affect mileage, at the same time, your effectively raising the gear ratio (say from a 3.73 to a 3.64 as an example, JUST an example) so you may or may not notice as large a loss as 3mpg. Id say around 1-1.5, depending on alot of different factors.

But the visual more than makes up for it, in my opinion. Im so tired of rolling on stockers for the last 2 years. But performance is first on the list, so 35s on 20s wont happen for awhile

 

Is there an mpg thread on here?

 

I have one based on my own testing... look in my sig for the link