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I currently own a 2003 ram 1500 slt 4x4. I love the truck but I want to get something newer in the next few months so I've been looking around.
Do you guys have an opinion on the newer 8 speed trans over the 6 speed the 2013 models have? I found a real nice 2013 bighorn 4x4 with 64000 on it.
Has the 6 speed trans with the 355 axle ratio. Its a little older than I wanted to go, I was thinking 2015 to 2017 maybe, but I really like the truck and the price is good for my area. Should I spend a few grand more for a newer model? Also my 2003 has the 392 axle ratio and I love it for towing my dirtbikes to the mountains, whats your opinion on the 321 axle ratio with the 8 speed trans? Seems to be a lot of those trucks out there. I like that this 2013 I'm looking at has the 355 gears.
Thanks for your help.
Joe
 

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The 8 speed trans is much better than the 6 speed.
I have the 8 sp. w/3.92's but the 3.21's would tow fine. Where the 3.21's do fall short is if you want to go to really tall tires, if you are staying with stock size tires they are a decent choice.
One thing to note with the 8 speed is 7th gear w/3.21's = 8th gear w/3.92's and 6th w/3.21 = 7th w/3.92's. So you can just just run one gear lower with the 3.21's to equal (on the upper gears) the same overall final ratio as the 3.92's.

The 3.21's have a much lower tow rating than the 3.92's if you are pulling a lot of weight, but I think both are more than the 3.55's w/6 speed.

@ 70 mph 3.92's = 1900 rpm, 3.21's=1400-1500 rpm
 

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I agree with the above comments and will add the 14 and newer ones also have 100,000 mile plugs changes up from 30,000 on the older ones. Because you are looking used, you will be able to drive the exact truck you are buying so put a fair number of miles on it and check Carfax.
My 14 Sport with 3:21's tows the largest U-haul trailer fully loaded with furniture great but the larger tire and heavier loads comment is dead on. Because I won't be towing anything larger than the U-haul I was specific in wanting 3:21's on my 19 Laramie as my driving is some city, rural and a fair amount of highway.
 

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Thanks guys, great info. I'm going to look for a newer model with the 8 speed trans.
joeyjrc, good luck with your choice. I happened to find a 2013 Ram 1500 Sport while on a trip to the west side of our state earlier this year. It had 64K miles and was a very clean transplant from B.C., Canada. I decided to purchase it because the price was finally in my price range. It had the 8-speed automatic and plug change at 100K miles, changes which were apparently made during the 2013 manufacturing run. Those two items alone are worth finding; mine has run flawlessly since I bought it in April of this year. Also, the 3.92 differential ratio is worth having; we consistently get 20+ mpg on unloaded trips with ours.
 

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I did the exact thing as you said I went from a 2003 with the 3.92 to a 2013 6 spd with 3.55. The mistake I made was I didn't order the 3.92 gear, I tried to change my order but I was to late my truck was already in the system. The 3.55 isn't bad but I did notice a small drop in mpg when I put the 35's on but then again I didn't buy it to get real great mpg.
 
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