I am glade you are happy, unfortunately I am not. I think the life span is dependent on the trucks owner. How you drive, is one of the main factors in how long the transmission will last. Jack rabbit starts, stop and go city traffic, ATF choice, and filter maintenance will all effect who long your tany will live a healthy life. Another influence, is geographical, were you live. Extremes in temperature will have an hand in life. Also people that live and drive in rough mountainous terrain can expect a shorter life span. The last part of the equation is what you use your truck for. Guy's that just commute back and fourth to work, will see a longer life span then those who tow. Delivery and work trucks will also see a shorter life span, they are constantly in use and drive many miles every day. I hardly ever use my truck, and only tow on action, I use 100% synthetics, replace filters and adjust bands on a rigid schedule. Yet my transmission started giving out at 42,000 mile. And was replaced at 45,500 miles. What happened? What went wrong? Nothing..... the transmission is just not strong enough for our trucks. period I know they up-dated the 48's, but don't kid yourself into thinking they fixed the problem, it's more like they stuck a band-aid on a ruptured artery. Those 1 extra clutch disk will help, and they made a few outer modifications that will also help. But the reason they did what they did was to fool the buying public, that would be you, into believing that they fixed the issue of a problematic transmission. It is still the 1970's technology, re-packaged and given a new coat of paint. For some reason, Dodge has resisted up-dating to a true truck type transmission, with HD converter, and 5-forward speeds. Maybe that is something they are going to do when the next, (4th generation) truck is released. They already have (MB) a true truck 5-speed auto, maybe they are saving it for the MB diesel? Kind of makes you wonder?? Any how, this "new", "re-born", "re-hashed" transmission is really no better then the 47 it replaced. And I know there are alot of people out there that like to think they now have a "TOW/HUAL" switch. Will the truth is you don't, FORD does not Dodge. You have a OD lockout, thats all. Same as the old 47 trany. I suppose there marketing stratify worked? They sold there late 03's and early 04's, and everyone assumed they had a mighty new auto transmission, so from there standpoint I can see why maybe they didn't change to a real truck trany. They didn't have to, the buying public, that is you again, excepted what was given to them, without opposition. The Chrysler transmission is a good one, it has been in service for almost 40 years, so that says something. But it was never met to be mated to a diesel engine, much less a diesel engine in a HD truck. I hope Dodge gets it right in the next generation, weather this new trany is mated to a Cummins or not, the time has come to put the 47-48 to rest.