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  #21  
Old 10-23-2013, 10:15 PM
TJC.geotech TJC.geotech is offline
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Actual effective final ratio with the 8 speed;

3.21; 15.07 10.05 6.75 5.35 4.12 3.21 2.69 2.14
3.55; 16.67 11.11 7.47 5.92 4.56 3.55 2.98 2.37
3.92; 18.41 12.27 8.25 6.53 5.04 3.92 3.29 2.61

Again, the splits are so small they are insignificant. Actually first gear with the 3.92's is virtually unusable.
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  #22  
Old 10-23-2013, 10:41 PM
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Dreyton Dreyton is offline
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I picked up my 2013 5.7 Laramie in May and took it from here in Alberta down through the Rockies to Idaho. I ordered 3.55 gears and got 3.21's but im pleasantly surprised to say that it pulled my 7300 lb trailer with no problem either in accelaration or power up hills. In fact the 8 speed more than compensated for the higher gearing and unlike my buddy with his screaming and lugging Ford 6.2 F-250 who eventually started shifting his tranny manually I had a quiet and very smooth ride. Bounus is I only pull trailers about 12 times a year the rest is no load driving so I even see the better gas millage. I don't want the 3.55's any more :-)
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  #23  
Old 10-23-2013, 11:36 PM
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[QUOTE=Otterdriver;1227996]
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Originally Posted by Thunderhorse View Post
Yes you should get what you're promised, but y'all need to realize that the final drive ratio on an 8 speed ram with 3.21 diff in 1st gear is 15.12:1. With a 4.10 and the 6 speed tranny its 12.3:1. I think a lot of the hate for the 3.21s is fed by those with the 6 speed where the 3.92 diff made a big difference, but the bottom line is that if a 6 speed truck with 3.92s was good enough for you, an 8 speed with 3.21s will actually be an improvement. Now you do get an 18.46:1 1st gear final drive ratio with an 8 speed and 3.92s, but the point of the post is to demonstrate the adequacy of the 3.21 with the 8 speed.[/QUO
Without straying too far off topic, how could an 8speed with 3:21's be an improvement over a 6 speed with 3:92's? Granted the 8 speed splits the power up more on the way up shifting, but you are still ending up with a taller final drive gear. You can't pull the same weight with the 3:21's........ unless I'm not understanding something.
Despite the fact that the differential is geared lower on a 6 speed with the 3.92, the first 2 gears (4.71:1 and 3.14:1 respectively) in the 8 speed transmission are both lower than the first gear in the 6 speed (3.0:1). The 8 speed has a greater overall range (4.04 vs 2.33 in the 6 speed), so you have a greater multiplication in lower ranges.

The 2nd gear of the 6 speed is the same as the 4th gear in the 8 speed (1.67:1); The 4th gear in the 6 speed is the same as the 6th gear in the 8 speed (1.0:1); and the top gear in both transmissions is the same (0.67:1). Because of this, a Ram with the 3.21 has a final drive ratio of 2.15:1 in its top gear vs the 2.63 ratio of the 3.92, while still having a lower ratio in first gear than the 3.92 with the 6 speed due to the greater range of the gearing in the transmission that having 8 gears affords. Despite this, the gears are still spaced closer on the 8 than the 6 which means you don't get the infamous "dead spot" that the older transmission was known for.

I have to agree with TJC.geotech as well. My 8 speed with 3.21 shifts out of first gear at around 5-7 MPH so I don't think the 3.92 would provide too much benefit. Maybe if you plan on lifting, or you like shifting into 2nd at 3MPH.

As far as towing is concerned, it can be a variety of things that limit capacity. For example, it turned out that the V6 trucks with the 8 speeds needed the parking pawl strengthened. Also, while it may be true that you have a taller top final drive ratio with the 3.21 than the 3.92 (2.15:1 vs 2.63:1), if you were to be towing in 7th with the 3.21 puts you at 2.69:1 which is negligibly different to the ratio with the 3.92. There has been some discussion on this forum (I think in the 2014 GD section) that they may be increasing the ratings for V8 8 speed trucks for 2014+ and retroactively for the 2013s similar to what they did with the 2010+ Ram 1500s (retroactively for the 2009s). As far as I know its just hearsay though.

ETA: Don't get me wrong, if you ordered a truck with a specific diff you absolutely should get a truck with that ratio. But in my opinion those who dog the 3.21 8 speed without driving one need to test drive one and see if they still feel the same. A lot of what you may feel is a tall diff may actually be the traction control nannies killing your power, so try turning that off too.
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Last edited by Thunderhorse; 10-23-2013 at 11:41 PM.
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  #24  
Old 10-24-2013, 11:36 AM
kxlexus kxlexus is offline
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Love my 3.92 8 speed. Wouldn't have it any other way. I drove a Ram with the 3.21 gears. It was a dog compared to my truck. You really should drive one before you dismiss the 3.92 gears.
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  #25  
Old 10-24-2013, 12:41 PM
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I drove one and have to admit it does scoot better than mine. The 3.21 is not bad but you can tell the difference between the 3.21 and 3.55. Seems to stop the delay felt at times going up and down hills. I have driven all three and there is a difference between them.
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  #26  
Old 10-24-2013, 03:31 PM
TJC.geotech TJC.geotech is offline
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In real testing, the trucks are virtually dead even in acceleration. Looking at the gear splits, you can see why. I'm sure in the first ten feet the 3.92 rigs just about rip your head off, but after that... no difference.

In the days of 3 speeds and 4 speeds, obviously there was a huge benefit going deep in the diff gears. They have moved all that gear multiplication to the tranny now, just like on a real truck... My over the road rig has 4.10's in it and pulls 50,000 lbs. I guess the engineers messed that up too.
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  #27  
Old 10-24-2013, 04:33 PM
kxlexus kxlexus is offline
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There is a reason Ram rates the trucks with 3.92 gears much much higher for towing
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  #28  
Old 10-24-2013, 06:17 PM
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Sometimes that first 10 feet of jerk is what matters coming out of a 3.92! I had the 3.92 in my 2011 and still regret going with the 3.55. Yes, I know overall not that big a deal the 3.55 will allow me to tow more than what I need. But sometimes I miss that short leap the 3.92 rear end had. At least I hope I have a 3.55 the build sheet says I do but the label was missing off the rear. In fact I checked several at the dealer lot and the labels were missing. Sounds like a conspiracy! Maybe Dodge got smart and started taking off the labels.
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  #29  
Old 10-25-2013, 06:51 AM
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Quote:
Originally Posted by kxlexus View Post
There is a reason Ram rates the trucks with 3.92 gears much much higher for towing
Marketing, competitive marketing.
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