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  #1  
Old 03-27-2013, 11:08 PM
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Default Towing with 3.21 gears

I have a 2010 1500 quad cab with the 5.7 2wd and I think 3.21 gears, not 100% sure about the gears as I bought the truck used. My understanding is that if I do have 3.21 I can only tow 6,750lbs and if thats the case can I just regear to 3.55 or a bigger ratio and that will allow me to tow more. I don't tow that often but when I do the numbers I pull according to the scales are going to be with in about 600lbs of that number, I haven't checked the numbers with my WD Hitch. Any info would be very helpful.
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Old 03-27-2013, 11:21 PM
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I not sure in it upping the tow rating but it would be a major help. Skip 3.55 and go either 4.10 or 4.56.

4.56 gears would have you at 2300 rpm at 70 mph.
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Old 03-28-2013, 11:25 AM
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If you dont tow alot, and want to keep any kind of fuel mileage, 3.55s will do fine. They will up the tow capacity. To what, Im not 100% about.

If you were towing every day, or not concerned with mileage, 4.10s would be great.
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Old 03-28-2013, 11:31 AM
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If you are going to go to the expense and trouble of re-gearing, I would think you would be better served to skip the 3:55 and go to at least 3.92. As mentioned before consider 4:10 if towing often and heavy and/or not concerned with mpg loss. The 3:55 in most cases should do fine, but again may not be the best choice if going through the effort of swapping gears. Not sure on your year, but on my 2012 I have 3:55 and it is rated to tow up to 8400 lbs., if I had the 3:92 the rating jumps to 10,000.
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Old 03-28-2013, 11:39 AM
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Well said Bruce. And I'm planning on dropping in 4.56 soon.
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Old 03-28-2013, 12:16 PM
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I have 3:55 and tow a 6.500 lbs travel trailer about 6 - 8 times per year. For me it works fine, yes it does some gear hunting with that ratio, but I drop it in 4th in the tow haul mode and trans temp stays cool.

If you were towing more than that, then I agree with the others and skip the 3:55 and go 3:92 or 4:10. If your not, why waste the gas mileage, unless you are looking for a performance truck.

According to Dodge, http://www.dodge.com/bodybuilder/201...ammlup1500.pdf you can tow 6,750lbs with 3:21, 8,750 lbs with 3:55 and 10,250 with 3:92. Get your dealer to check your VIN for your gear ratio.
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Old 03-28-2013, 06:48 PM
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Thanks Guys, in my Tundra it did not have a gear option, but I think it had 4.10 and pulled whatever I wanted it to. The Ram has options and the dealer is looking into this matter for me, I'm just nervous that there is more to do than a simple regear to truly increase "towing capacity" hopefully it will be a simple fix. I just don't want to tow and be nervous the whole time about if it will hold up or not. Also I crawled under my truck and noticed that the hitch is only the small bolt up bracket piece not the full frame to frame kind. The dealer said it is the factory installed hitch on all 1500 so it can handle the 10,000 towing capacity, but all I can find are the aftermarket ones that are rated for 6000 lbs trailer capacity. Does anybody know more about that, it too would be helpful.
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Old 04-06-2013, 03:50 AM
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I had the horrible 3.21's in my 09 2wd. 1st thing I did after buying it was off to the local 4x4 shop for a set of 3.92's. was like night and day difference. Also I got much better mileage. The truck it to heavy for the 3.21's. also forget 3.55's I have them in my 13 and I hate them. I though they would be better on gas. Nope and the truck feels so much slower it makes me miss my 09. Oh well live and learn. It's getting new gears soon as the lift and 35's go one.
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Old 04-08-2013, 06:11 PM
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Default Re gear

Just out of curiosity, how much are guys spending getting your trucks geared. I only ask because I'm being quoted 800$- 1450$ and I'm 2wd so it's only the rear axle. I know you get what you pay for but wow. I'm trying to get itemized quotes to see if some are rebuilding with new bearings and all or just replacing the ring and pinion. The trucks only got 22,000 miles so I don't think I would need a rebuild but I also know that sometimes you have to replace certain parts in order to get a quality product at the end. Also I'm in San Antonio Tx so if anybody know of a good shop to do the regear please let me know.
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Old 04-09-2013, 11:47 AM
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changing gears will defintiely effect towing capacity. Maybe not "officially", but it will make it easier to pull the weight. If you get stopped by a cop and are over your vehicles rating, I don't know that they will care that you changed gears.

I have 3.55 with a 4.7L and tow 4000ish lbs now and again and it's no sweat. I'd imagine a hemi with 3.55's would pull 6000 lb no sweat.

Honestly the weight isn't a big deal, it's the damn drag from the trailer that gets me.
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