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Custom Dodge Ram Performance Mods - Engine - 4.7 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 4.7-liter V8 engine - 310 horsepower, 330 lb-ft of torque.


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  #1  
Old 08-12-2013, 09:32 AM
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Lightbulb What gears work best??

I have a '12 Ram 1500 and am looking into changing the gears in the rear end based on advice from this forum it seems like this will help me with acceleration and overall low end torque. I currently have the 3.55 gears and want to know what gearing I should look into for my application? I dont do alot of towing but do occasionally once a month tow a 20 ft. boat but my main driving is around town and highway miles.
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Old 08-12-2013, 09:59 AM
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if you don't tow or run big tires I see no reason to spend the money on a gear change. I don't think the results will outweigh the costs.

main reasons for changing gears are guys who run big heavy tires to help turn them better or guys that are modding their truck to be fast at the track.
daily driving I don't think you'd be satisfied with a gear change. that's just my opinion and something to think about. plus if you are 4wd then you have to change front and rear gears and I think a gear swap in a 2012 is a bit complicated and more expensive because of the carrier.
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Old 08-12-2013, 10:51 AM
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Originally Posted by gonefishin776 View Post
if you don't tow or run big tires I see no reason to spend the money on a gear change. I don't think the results will outweigh the costs.

main reasons for changing gears are guys who run big heavy tires to help turn them better or guys that are modding their truck to be fast at the track.
daily driving I don't think you'd be satisfied with a gear change. that's just my opinion and something to think about. plus if you are 4wd then you have to change front and rear gears and I think a gear swap in a 2012 is a bit complicated and more expensive because of the carrier.
Thanks for the quick response! I see what you mean about maybe not being worth it now within the next 3 months I will be towing @ a 10ft enclosed trailer on a regular basis with tools so I'm trying to get ideas for the future on what might make that an easier job for my truck besides swapping a HEMI in it!
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Old 08-12-2013, 12:24 PM
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Originally Posted by FloridaRam View Post
Thanks for the quick response! I see what you mean about maybe not being worth it now within the next 3 months I will be towing @ a 10ft enclosed trailer on a regular basis with tools so I'm trying to get ideas for the future on what might make that an easier job for my truck besides swapping a HEMI in it!
Ohh okay. well I suggest 4.10 from your current 3.55. I'm not familiar with looking at gears with respect to towing, but I'd imagine you want the taller gears for stop/go pulling that thing. I don't think a jump to 4.56 would be necessary. i've heard 3.55 to 3.92 is not a noticeable difference so go to 4.10
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Old 08-12-2013, 08:57 PM
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Gears always help with towing and acceleration; the downside is the loss of fuel economy on the highway.
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Old 08-15-2013, 09:22 AM
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the downside is the loss of fuel economy on the highway.
can you explain this to me im not that smart.
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Old 08-15-2013, 10:27 AM
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can you explain this to me im not that smart.
"It's the ratio of how many times the drive shaft turns to how many times the axle turns and is set up by choosing how many teeth are on the ring and pinion gears.

Bottom line, the higher the ratio, the more power (Torque actually) at the rear wheels, also the higher your engine runs (RPM's) and the poorer your gas mileage.

btw - higher ratio is reffered to as lower gearing (geared down) and lower ratio is reffered to as higher gearing ... nice and confusing eh?

example, with a 4.10 gear set, the ratio is 4.10 to 1 so for every 4.1turns of the driveshaft, the rear axle will be turned one time and you will have a torque advantage of 4.1x
On the flip side for every say 10 turns of the wheels, your drive shaft will turn 41 times & your engine has to turn 41 times in high gear (not overdrive).
With a 3.70 gear, your Torque advantage is 3.7 times but now if your wheels turn 10 times, your drive shaft and engine will only turn 37 times. As with everything auto, always a trade off."

-disclaimer, not my words. explanation from someone else
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Old 08-15-2013, 12:50 PM
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Quote:
Originally Posted by gonefishin776 View Post
"It's the ratio of how many times the drive shaft turns to how many times the axle turns and is set up by choosing how many teeth are on the ring and pinion gears.

Bottom line, the higher the ratio, the more power (Torque actually) at the rear wheels, also the higher your engine runs (RPM's) and the poorer your gas mileage.

btw - higher ratio is reffered to as lower gearing (geared down) and lower ratio is reffered to as higher gearing ... nice and confusing eh?

example, with a 4.10 gear set, the ratio is 4.10 to 1 so for every 4.1turns of the driveshaft, the rear axle will be turned one time and you will have a torque advantage of 4.1x
On the flip side for every say 10 turns of the wheels, your drive shaft will turn 41 times & your engine has to turn 41 times in high gear (not overdrive).
With a 3.70 gear, your Torque advantage is 3.7 times but now if your wheels turn 10 times, your drive shaft and engine will only turn 37 times. As with everything auto, always a trade off."

-disclaimer, not my words. explanation from someone else
Holy crap thats confusing
BTW: thanks for trying lol
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Old 08-15-2013, 01:25 PM
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Quote:
Originally Posted by izzy View Post
Holy crap thats confusing
BTW: thanks for trying lol
It's really not...but okay.

here is another good explanation.

http://www.carcraft.com/techarticles...s/viewall.html
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Old 08-20-2013, 10:45 AM
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Quote:
Originally Posted by gonefishin776 View Post
It's really not...but okay.

here is another good explanation.

http://www.carcraft.com/techarticles...s/viewall.html
thanks man this actually helped alot

Quote:
Gearing Lingo
Lower gears are higher numerically; they provide more of a mechanical advantage and cause the engine to spin more rpm per mph than higher gears. Higher gears are lower numerically; they provide less mechanical advantage and cause the engine to turn less rpm per mph than lower gears. Hence, 3.50:1 gears are higher than 4.10:1 gears, but lower than 3.08:1 gears.
especially that part
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