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Old 10-31-2013, 10:27 AM   #21
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Originally Posted by kwbybee View Post
great advice everyone. so maybe I'll go for the 3.92 ratio as that is as low as I can go. There is only like $10.00 difference in price between the 3.55 and the 3.92.
If your truck is 4x4 there will be a BIG diff.in Price! Youroo!!
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Old 10-31-2013, 10:36 AM   #22
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I run at 55 mph, and get even better mileage! I know that probably ticks some people off, but that's what 4 lanes are for. On 2 lanes when traffic builds up behind me I pull over and let the traffic pass! Last summer on our way to Branson and back I was getting 14 + mpg with the wind in my back. 10 to 12 with no wind conditions. Safe travels all!
Nothing wrong with that, I try to tow in a place that suits the current gear selection. There is a window for each gear, I don't like to sit on the fence of at say 55. When 5 mph more or less is easier on the system. I say system because I am a transmission guy I watch my trans temp closely. You need for the converter to be locked for the trans to cool down. ( when a trans goes into hot mode it applies the TCC. To help it cool down)Whatever makes it stable is what I do. The new diesel I have has much much wider windows of operation. And that is simply because of more torque. The Allison transmission is a beast compared to what I was using. The rear axle and brakes are much more stout as well. Happy truck = happy trip.
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Old 10-31-2013, 10:48 AM   #23
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If your truck is 4x4 there will be a BIG diff.in Price! Youroo!!
Why? Price within a ratio or two is usually pretty close. Unless you jump so far you have to change carriers. Say from.2.73-4.10. Then a thicker Gera or new carrier is required.
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Old 10-31-2013, 11:30 AM   #24
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Why? Price within a ratio or two is usually pretty close. Unless you jump so far you have to change carriers. Say from.2.73-4.10. Then a thicker Gera or new carrier is required.
4X4 is more expensive because you have a set of gears in the front axle also (twice as much??). My F250 has 3.73, this gearing came standard with the tow prep package. I’m of the opinion that towing a TT is towing a TT regardless of what snake-oil/voodoo tricks you may try. The only thing that may work is lowering your speed (55mph), and lets face it, you’re camping, what’s the rush anyway
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Old 10-31-2013, 12:16 PM   #25
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Your shifter on that 09 Ram has a tow haul button that can eliminate both overdrives. Pressing it one time will illuminate the Tow Haul light on the dash this eliminates 5th gear and results in about a 250 RPM increase. If you press the button again the OD off light will illuminate and this locks out both 4th and 5th gears and keeps you in 3rd wich is a 1:1 ratio this would bump your RPM up quite a bit. I swapped the 3.73 out of my 2500 for a set of 4.56's and tow in 3rd gear. 60mph is about 2800 RPM's I stay between 55 and 60 my camper is large and asks alot of my truck but it does the job. Try seeing how the OD off does for you that would keep you in 3rd gear and eliminate any gear hunting for sure. This OD off feature was not available until 2006 on the gas Rams you could only eliminate 5th gear for the measley 250 rpms it was worth
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Old 10-31-2013, 12:33 PM   #26
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The statement has been made that “the lower your gear ratio, the greater the RPM's from your engine to maintain an equal driving speed.”* I am confused (not an infrequent occurrence).

Assume, for purposes of illustration, that the gear ratio is 2 to 1. As I understand it, that means the drive shaft rotates two turns for each one turn of the wheels. If the gear ratio is lowered to 1 to 1, the drive shaft must now only rotate one turn for each one turn of the wheels. Therefore, it seems to me that engine rpm's necessary to maintain an equal driving speed is lower when the gear ratio is lowered.

What is wrong with my understanding of this relationship?
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Old 10-31-2013, 12:42 PM   #27
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The statement has been made that “the lower your gear ratio, the greater the RPM's from your engine to maintain an equal driving speed.”* I am confused (not an infrequent occurrence). Assume, for purposes of illustration, that the gear ratio is 2 to 1. As I understand it, that means the drive shaft rotates two turns for each one turn of the wheels. If the gear ratio is lowered to 1 to 1, the drive shaft must now only rotate one turn for each one turn of the wheels. Therefore, it seems to me that engine rpm's necessary to maintain an equal driving speed is lower when the gear ratio is lowered. What is wrong with my understanding of this relationship?
Think of gears on a bicycle. The higher the gear, the easier it is for you to pedal, but you burn more calories due to you legs spinning faster. Opposite is true for the lower gears, sure you can get going faster without spinning your legs so fast but it's harder to maintain speed.
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Old 10-31-2013, 01:30 PM   #28
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I agree with everything you say. Indeed, a higher gear ratio does equate to more torque. Nonetheless, this does not explain (at least to me) why higher engine rpm's would be required to maintain the same driving speed if the gear ratio is lowered.
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Old 10-31-2013, 02:13 PM   #29
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Al when talking about rear end gears it is the relationship between the ring gear and pinion. Example a 3.73 gear mean the for every turn of the ring gear the pinion will turn 3.73 times. The pinion is driven by the driveshaft /transmission/engine. It all starts at the engine if it takes 3K rpms at the motor to turn the pinion wich is at the other end of the component ladder with a 3.73 to 55 mph then to keep the pinion at the same speed with a 4.56 it is impossible to do unless the engine all the way at the other end increases RPM. Tire diameter can also play a role in this
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Old 10-31-2013, 02:16 PM   #30
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Or easier comparison do 15 mph with a 10 speed bike in 1st gear and then 10mph in 10th gear there will surley be a difference in the pedaling RPM.
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