3.73 or 4.10 gears what to get??
Champion
Joined: Feb 2005
Posts: 3,710
Likes: 2
From: Skagit County, WA
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. 
Professional
Joined: May 2006
Posts: 197
Likes: 3
From:
Here's a ratio calculator. Use the "Find new gear ratio with new tire size"
http://www.snoman.com/HTML/axlecalc_5a.html
Sorry, not exactly an answer to your question hiperf. Didn't realize this until I punched some numbers in. I guess this just tells you what ratio you would need to make it closer to your original with new larger tires.
http://www.snoman.com/HTML/axlecalc_5a.html
Sorry, not exactly an answer to your question hiperf. Didn't realize this until I punched some numbers in. I guess this just tells you what ratio you would need to make it closer to your original with new larger tires.
Sorry if it's only a senior moment.
Registered User
Joined: Dec 2008
Posts: 11
Likes: 0
From: Aspers, PA
3.73 or 4.10
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
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
Registered User
Joined: Dec 2008
Posts: 11
Likes: 0
From: Aspers, PA
3.73 or 4.10
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
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