I purchased the dyna-trac free spin hub conversion,and was just wondering if anyone has done the install.
Maybe they can give me some tip's.
Also was wondering if there are any significant MPG gains,as the truck's only getting about 12 mpg right now.  

Never installed a dynatrac conversion but it is expensive and involve because you have to change stub shaft spindle and hub and bearing too. Hardest part will be tear down, assembly is pretty straight forward and easy to service in future. As far as MPG gains you might see, that depends on your configuration and how you drive. If this is a lifted truck you will likely not see much change around town if any in warmer weather. On highway maybe 1 MPG or so. If it is a stock truck (engine, exhaust, tires and so on) gains may be more noticeable. Also, during winter it will help a bit more because you will not be churning heavy lube in front diff in 2wd.  Sadly at the price of those kits, you will likely never save enough fuel to pay for kit as you would have to drive at least 100,000 miles and get a 1 MPG improvement over 12 MPG to about break even at todays fuel prices. Even sadder part is that Dodge could have spec'ed the axle to have lockout hubs from day one at a cost to them of maybe 50 to 75 bucks a axle. Dodge is still being pig headed about this even with todays fuel prices. Personally it is a reason I would never own a 4x4 Dodge today because of this. If they were to go back to offering lockout hubs like they did from 80 to 94 I would give them a serious look. BTW, one this thing about your truck is that starting in 03 they used a upgraded solid front axle that is better than the one used from 95 to 02 in raw strength.  

What year is your truck?  

I would assume at least 03 because 95 to 02 had a axle disconnect and I would not waste money on a new hub for those older axles because they have a weakened notched axle tube near diff. I would replace whole axle assemble with one with lockout hubs on it.  

Ya i'de like to see how this one works out. wonder how much heavier the 3500 is vs. the 2500.mine was 6100 w/full tank,10.5 rear and 9.25 front.wonder if he puts 33 street treads if it'll help recoup the cost quicker?  

Thnx for the info sno.yesterday the kit was ordred for my "04 3500 dually 4x4.w/banks turbo,intake ,exhaust.
It also has a buckstop frnt bumper w.12000# warn winch just for fun.It is my company truck.And until today i thought i was getting a free spin hub conversion for my truck.
Now my boss is thinking of putting it on his '06 dodge mega cab/w cummins.6" fabtech lift,3"body lift,37" pro comp's.Last week he was out 4wheelin and had way too many beers.long story short the entire front axle/housing got bent 2" and the stock hubs got thrashed.The truck got jumped about 8 ft and came down hard on the passenger side landing in a small wash The billstein shocks are a total loss and there are some bent suspention component's.
I have taken over ordering all the new parts for his truck and mine will have to wait.We got a new stock front end and we will put the dyna trac kit on there.And hopefully he wont try to jump this hugenormousgigantic truck ever again.  

Wonder how hard it would be to get the outer parts(outer C?) from a 60 or 50 axle and transplant the parts over to the AAM 9.25? or maybe a conversion kit to replace the entire offending outer parts with new  ones that are better suited to upgrades. and one last thought.whre is the aftermarket 60 assembly,ready to bolt in?  

I would not swap D60 parts on it even if I could. AAM made the knuckles stronger on this axle because Dodge was having wear issues with D60 with a 1100 lb plus motor in front end. That guy was lucky that he did not break more and I would have frame checked for cracks. I know some like those motors but you do not want to jump and play hard with a 1100 lb motor in the front of a lifted truck. If it had been a gas engined truck in same scenario, it would have suffered less damage or maybe none at all due to less weight to "catch" on landing. That fact that the axle did not break completely is a testament to the strength of the AAM 9.25.  Had it been a old style D60 it would have likely broken and been far worse.  

The Dynatrac Free Spin kit is very well thought out and it is pretty simple to install. The hardest part is swapping the U-Joint. I noticed a 1.5 MPG increase by doing this to a 2003 Dodge Ram 2500 Cummins.  

Anyway you cut it, there is simply no excuse for Dodge not including some sort of lockout hub from factory. I have no doubt the they do it the way they do to save cost at owners expense. Silly part is that on a 30 or 40 grand plus truck, what is another 100 bucks give or take. It is not going to break the bank and may actually help it because I for one would never buy a Dodge because of this. I am sure there are others.  

I've owned a 98 1500 4x4, and two 2001 2500 CTD's, and never liked the unitized hub assemblies that Dodge used.  Don't have a problem with the truck in general, as overall, Dodge can build a good truck, but those hubs are horrible...I think that Dodge did that intentionally in order to force the unlearned to take it to the dealer, where they can make a ton of money.  They're not that hard to swap out, but the hubs themselves are expensive.  After my 1500, I learned to do the swap in half an hour, from the time it took me to get my tools to the time I was putting the tire on.  (Went through six in a year)  I'd still like to put the conversion on my 2001, simply because the manual locking hubs are a lot simpler and stronger, and I'd rather not have to be replacing a 380 dollar part every time I go wheeling.  Since I know my CTD is heavy, I'm not going to be trying to jump it off a dune or anything, so chances of my D60 snapping are pretty slim, and I'd like to think the manual lockouts would still out last the hubs...  

Actually that bastard hub design dates back to 70's. Dodge used it on 73 to 79 model 4x4's. ALso I would not was money on the hub conversion on a 95 to 02 axle in a Dodge(even a D60) because that axle has been weakened and prone to bend. The notched axle out for a disconnector of the axle shaft on passenger side and I have seen many bent a bit on lifted trucks. If I had a truck in those years and wanted a upgrade with hubs, I would use a earlier axle with hubs on it and weld on needed brackets.  

Their is also a hub conversion kit from EMS.
http://emsoffroad.com/shop/index.php?main_page=product_info&products_id=86&zenid=820f566ccbdf8334864fb3b4036fafcd  

Sorry, this might be a dumb question.

I have replaced the hub assembly on one side of my 03 2500 cummins with an oem style bearing.  The new bearing came with a ABS sensor already installed, so I never took out the old sensor.  I really never payed any atention to it.  I didnt even know it came out.  I also had an intrest in the spin free kit.  And was wondering how you remove the sensor to install it in the new kit?

thanks
Jimmy  

the release is worth the expense. i hired ft collins 4x4 in colorado to install the dyna trac free spin on my 98 dodge duelly. these people pay attention to detail & set. i replaced everything new including calipers. total cost 4400. travel & place in neutral & it never quits rolling. also installed 4" ss exaust from cummins to exit. milage with 4.10 & 4.11 is at 17.5 mpg. engine milage 320,000. total investment over new purchess in 1999 is 15000 & includes new leather interor.