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  #11  
Old 10-03-2013, 10:55 PM
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Trail Whale Trail Whale is offline
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Quote:
Originally Posted by battlerattle View Post
Google AAM 10.5 5.13 gears. Remember the axle is AAM not Chrysler. Most are listed as GM gears, but a good shop will know which are compatible. Sierra Gear for example makes a comparable ring and pinion.
Thanks for the heads-up! I don't see them listed on their site though, I'll have to contact them tomorrow then, if that's the case (that they do make them) I am VERY happy. I have spent a good bit of time Googling AAM 10.5 gearing choices (and yes, the ubiquitous 10.5" ring gear 14BFF GM axle comes up constantly!!! ) and had no luck. On "other forums" I have repeatedly been told or seen it said that no such thing exists as lower gears than 4.56 gears for the AAM 10.5. I was actually originally contemplating 40s for my truck and went 37s instead to keep tire size friendlier for the 4.56 gears. If they make the lower gears, this opens up new horizons for future tire size! (but my truck is gonna be on the 37s for a while, since I already bought them, and tires are $$$!)

Sorry for the thread hi-jack, vinoaddict!!!

Last edited by Trail Whale; 10-03-2013 at 11:01 PM.
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  #12  
Old 10-04-2013, 10:24 AM
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Quote:
Originally Posted by Trail Whale View Post
Thanks for the heads-up! I don't see them listed on their site though, I'll have to contact them tomorrow then, if that's the case (that they do make them) I am VERY happy. I have spent a good bit of time Googling AAM 10.5 gearing choices (and yes, the ubiquitous 10.5" ring gear 14BFF GM axle comes up constantly!!! ) and had no luck. On "other forums" I have repeatedly been told or seen it said that no such thing exists as lower gears than 4.56 gears for the AAM 10.5. I was actually originally contemplating 40s for my truck and went 37s instead to keep tire size friendlier for the 4.56 gears. If they make the lower gears, this opens up new horizons for future tire size! (but my truck is gonna be on the 37s for a while, since I already bought them, and tires are $$$!)

Sorry for the thread hi-jack, vinoaddict!!!

Make no mistake, no one will tell you they have them. But a good shop will look at the dimensions and be able to tell you which ones are compatable. There are some differences between the Chrysler and GM 10.5, but many similarities as well.
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  #13  
Old 10-14-2013, 06:21 PM
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I think I've got the 4.10 Vs. 4.56 issue figured out finally. I saw online that the 6.4 would have the 66rfe or the optional Aisin. Due to the significantly lower first (3.75 vs 3.23) and somewhat lower (2.0 vs 1.84) second gears on the Aisin you would actually have lower gearing down low and mostly identical up high. In my mind this is how they are expecting to boost mileage and still have a mudder/rock crawler that can rightfully keep the Power Wagon name.

So you're paying about $700-800 for the motor upgrade and about $700-800 for the tranny upgrade of the ~$1500 premium the 6.4 is gonna command.


My $.02

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Old 10-30-2013, 02:16 PM
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Lil Black 4x4 Hemi:

I haven't heard that the 2014 will get the optional Aisin transmission, but that could be a great addition. First gear would actually be 3.75 vs 3.0. Correct me if I'm wrong, but the 68rfe has a first gear of 3.23, which the Power Wagon doesn't have, correct? Also, below is something I posted a while back concerning the axle ratio changes, and how the new Power Wagon will actually have less torque at the wheels than previous models. That calculation would change if the Aisin transmission is used in that the Aisin would allow slightly greater torque for the first two gears (especially 1st gear), but the 66rfe would allow greater torque for gears three through six. Read what I have below, and seriously consider buying a 2013 Power Wagon...they might be the last "real" Power Wagon.

"By performing a simple calculation, I've discovered that the 2014 Power Wagon, although with a more powerful engine, will still have less torque at the wheels compared to a '13 model or older. The reason it will have less torque is that it is losing torque multiplication from the new 4.10 axle ratio. Even with the additional 29 torque at the engine, the 4.10 gears just can't compare to the 4.56 gears. Below is theoretical calculation I've created based off the pickup's weight in tons, that demonstrates the max torque at the wheels per transmission gear ratio. **This calculation doesn't factor in mechanical slippage, wind, and other environmental factors. Max torque at wheels per transmission gear= (transmission gear ratio)x(axle gear ratio)x(max engine torque)/(vehicle weight in lbs./2000)
Transmission gear ratios are 3, 1.67, 1.5, 1, 0.75, 0.67
Vehicle weight is 6350 lbs (approximately)
2013 and older max torque is 400
2014 max torque is 429
2013 and older axle gear ratio is 4.56
2014 axle gear ratio is 4.10
Here are the values per transmission gear for 2013 and older models, and 2014 models (expressed in torque at wheels per vehicle weight in tons)
2013 and older, 2014
1st 1723.46, 1661.95
2nd 959.4, 925.15
3rd 861.73, 830.98
4th 574.49, 553.98
5th 430.87, 415.49
6th 384.91, 371.17"
Here is more to think about:

Other factors like cylinder deactivation, although good when working, may be troublesome and might not even get better MPG. Lastly, some may like coil springs, but I know a lot of people who don't. Look at any late '60s GM 3/4 pickups, those coil springs (GMC model I believe) never lasted the test of time. I know technology has came a long way since then, but physics have stayed the same. The physics behind a leaf spring are unbeatable.
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  #15  
Old 11-13-2013, 06:37 PM
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Wildcard85 Wildcard85 is offline
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The numbers on other first post are slightly off.

Transmission gear ratios should be 3.23, 1.84, 1.41, 1, 0.816, 0.625 (66RFE) instead of
3, 1.67, 1.5, 1, 0.75, 0.67. I pulled them off of Wikipedia at the time, but I see there is now a correction.


Here are correct the values per transmission gear for 2013/2012 models, and 2014 models (expressed in torque at wheels per vehicle weight in tons)

2013/2012, 2014
1st 1855.60, 1791.91
2nd 1057.06, 1020.78
3rd 810.03, 782.23
4th 574.49, 554.77
5th 468.78 , 452.69
6th 359.06, 346.73

Also, someone on another site said that the '14 Power Wagon would still have 4.56 gears standard and 4.10 as an option...has anyone read this anywhere? I obviously wouldn't have to perform any calculations if the gear ratio could remain at 4.56
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