Who has the most reliable factory automatic transmission? - Diesel Forum - TheDieselStop.com
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Old 09-16-2010, 01:30 PM   #1 (permalink)
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Who has the most reliable factory automatic transmission?

Well, we are probably a few years out on replacing our trusty 13 year old F250.

The wife has never liked the 6spd and refuses to buy another one. I don't mind it, but towing with it, which is what we do is a bit tedious.

At this point we are leaning towards a Dmax Allison combo even though I really hate the truck attached to it.

I know the Allison is marketed well and I personally know of no failures myself although I am sure they have had their share.

I know the 2003 up Dodge autos have really improved over the 90s era Dodge autos.

I know the early Superduty auto trans was complete crap stock which is why I specifically looked for a 6spd at the time.


The reason I ask factory reliability is, I refuse to buy a truck and then have to sink thousands of dollars into a trans to make it tow worthy. That complete crap to me.

So, routine maintenance aside, who has the best transmission from say 2005 on?
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2006 F350 Lariat, 6.0 PSD CC LB 4X4. 92k miles.
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Mag-Hytec trans pan, 08 Diff cover.
2" leveling kit. RS9000 Shocks. B&W Turnover Ball/ Companion Hitch. Airlift 5000 airbags.
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2012 Heartland Sundance 3100RB 5th wheel. 36' @ 12k pounds.
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Old 09-19-2010, 11:53 AM   #2 (permalink)
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Every stock transmission will suffer reliability and longevity problems if you hop up the engine attached to it without a corresponding upgrade to the transmission.
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Old 09-19-2010, 12:42 PM   #3 (permalink)
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I concur doug, but with the power output of todays modern engines, I don't see myself modifying anything.
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2006 F350 Lariat, 6.0 PSD CC LB 4X4. 92k miles.
Wix/Baldwin coolant filter, Dynomax Ultraflow exhaust, cat mod, Edge Insight CS/with EGT.
Mag-Hytec trans pan, 08 Diff cover.
2" leveling kit. RS9000 Shocks. B&W Turnover Ball/ Companion Hitch. Airlift 5000 airbags.
LineX, 20% tint, Weathertech liners.

2012 Heartland Sundance 3100RB 5th wheel. 36' @ 12k pounds.
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Old 09-25-2010, 01:16 PM   #4 (permalink)
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with all the upgrades on your truck, i would drive it as long as i was able i would never get rid of something i like because the wife doesnt like to drive it. men seem to buckle tenfold more than a woman ever would. yes i have a wife, but if she wants to go somewhere and all thats available i one of my bronco's or my truck drive it or sit at home.
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Old 09-25-2010, 10:54 PM   #5 (permalink)
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In stock form, I doubt any of the three autos will give you any trouble. Having said that, I'd put the Ford 6R140 and the Allison even with the Dodge 68rfe just below them.

The Ford 5R110 ('05-'10) is a fantastic auto as well.
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Old 09-26-2010, 10:29 PM   #6 (permalink)
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I have an 07 LBZ Duramax with the 6 speed Allison auto running a 90hp tow tune and haven't had any trouble after 75k miles. I also have an 02 LB7 Duramax with the 5 speed Allison auto running a 75hp tow tune and haven't had any trouble after 178k miles. The transmissions are stock in both trucks and get the external filter changed every 25k miles and get the pan drained and refilled every 50k. I tow a 15000-16000# enclosed goosneck trailer and both trucks have spent half their life towing.
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