I didn't buy the truck knew, but that's how I recall the options... I could very well be on the other side of the fence from correct...

 

Alldata has 3.73, 4.10, and (power wagon) 4.56 gears listed as options for '06. I'm fairly certain that Dodge has offered at least 2 different ratios for most years, but I haven't watched every year to make sure.

 

Perhaps I'm having a brain fart but I would like to see what my gears would be if I switched to a taller tire. Is the old and new tire reversed on this calculator? I put in 30" old and 33" new with 4.10 gears and came up with 4.51. Would the gear be closer to 3.73 as if you switched the numbers to 33" old and 30" new.

Sorry if it's only a senior moment.

 

Easiest way to remember is the taller tire the shorter the gear ie:
30" moving up to 33" = ratio 4.10 to 3.73
and visa versa
33" to 30" = 3.73 to 4.10
the numbers used are ONLY examples these are not the actual change "seen"
Back in the day an old racing trick to use descent gears on the street and have a descent ratio for leaving the line at the track was to put really short slicks on the car.
saved us from running around with 4.56 gear all the time and the engine SCREAMING to run 60 mph on the road.
Bob

 

This is what I thought. But with this calculator says the opposite. I want my 4.10 to act like 3.73. If I go with a taller tire, I could do this. Correct?

 

Yup, the taller the tire the larger the circumfrence the less number of times it has to go round and round to cover the same distance.
That's one reason why over the road truck tires last 150> 200K miles even though they carry huge amounts of weight. Less revs per mile =less heat=longer tire life.
If you know the circumfrence of any 2 tires it's relatively easy to figure out how many revs each tire will do per mile.
Tire "a" circumfrence 70" and there is 63,360" in a mile soooo
63,630/70=905.14 revs per mile
Tire "B" circumfrence 80" sooooo
63,360/80= 792 revs per mile
and so on.
If you REALLY want to get crazy
Tire "B" 792 x 3.73=2954.16 engine revs per mile assumming zero slippage @ 1to 1 final drive trans ratio
Tire "B" 792 x 4.10=3247.2 engine revs per mile assumming zero slippage @ 1to 1 final drive trans ratio
And I could keep going.
Bob