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Tractor Talk Discussion Forum

Bad Dodge transmissions ?

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ronnieblue

08-23-2007 21:20:57




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We had a fellow tell us today that the Cummins diesel 24 valve motor had to much power for the automatic transmission. If pulling a heavy load you should never run it in the lower portion of the overdrive. Is there something to this? Im sure you all know more about it than I do. It is a 2002 2500.




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jocco

08-24-2007 06:27:04




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 Re: Bad Dodge transmissions ? in reply to ronnieblue, 08-23-2007 21:20:57  
Do any of you guys know how to shift a standard???



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ronnieblue

08-24-2007 16:22:36




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 Re: Bad Dodge transmissions ? in reply to jocco, 08-24-2007 06:27:04  
I will tell you if you really what to know. It is not really confusing. Most people know how, but if you dont know how everybody can tell you.



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dhermesc

08-24-2007 08:13:14




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 Re: Bad Dodge transmissions ? in reply to jocco, 08-24-2007 06:27:04  
Usually a standard is even weaker than an automatic.



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Luke S

08-24-2007 06:16:01




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 Re: Bad Dodge transmissions ? in reply to ronnieblue, 08-23-2007 21:20:57  
The older one's(A518's, 47rh's, 47re's) had to be driven right and maintained correctly if used under heavy conditions or you could have problems. The newer 48re is darn near bullet proof, and the new 68rfe is even better yet. The newer one's are as good as anything else out there.



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cornboy9@hotmail.com

08-24-2007 05:51:26




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 Re: Bad Dodge transmissions ? in reply to ronnieblue, 08-23-2007 21:20:57  
The big thing is to not lug the engine in OD below about 1,800 rpm because the oil pressure that locks up the converter is too low under that speed to keep the converter locked up tight. The general rule of thumb is if you can pull the load in OD without lugging the engine or the transmission shifting in and out of overdrive you should be okay to run in OD.



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dhermesc

08-24-2007 05:45:53




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 Re: Bad Dodge transmissions ? in reply to ronnieblue, 08-23-2007 21:20:57  
One other thing to remember, those transmissions need to be serviced. Its amazing how long one will last if you change the fluid at the recommended intervals and how fast you can tear one up by not keeping it up. We don't run Dodges but our Chevys have been hitting some pretty high mileage marks without many failures.


I am not familar with the HD transmission in the diesel, but I know the Dodge cars are very specific about the type of oil you put in them, using a cheaper brand (like one Jiffy lube will try to put in) will ruin one faster than not changing it at all.

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Mike M

08-24-2007 05:03:36




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 Re: Bad Dodge transmissions ? in reply to ronnieblue, 08-23-2007 21:20:57  
I thought for sure my manual says not to tow in OD so I turn mine off when I tow.



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Bill46

08-24-2007 04:49:44




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 Re: Bad Dodge transmissions ? in reply to ronnieblue, 08-23-2007 21:20:57  
Don't know a lot about the 24V, but the 12V had problems with the throttle positioning reostat.
It would get dirt and crud in it and the converter would lock and unlock for no reason giving the impression the lock up was bad.
I have a 12V (1996) with 253K on it. I have pulled some awful loads across the country and never had a real problem...just the reostat.
But, I always kinda back off the throttle a little when the converter is about to lock up. After it locks up I run the heck out of it. No problems to date. Biggest thing is service it by the way you run. Hard use means more frequent service.
I pulled over 12T across Ky and Tenn coming back to Tx this last year with it in lock up and it did not die on me.
Just my 2 cents.

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Vern-MI

08-24-2007 04:18:09




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 Re: Bad Dodge transmissions ? in reply to ronnieblue, 08-23-2007 21:20:57  
Diesel torsionals are much higher than gassers so when the diesels are used with a locking converter the converter damper must absorb those high torsionals. The damper is somewhat like a spring damper on a manual clutch disc only with a lot more rotational travel to harness those torsional peaks. It gets a real workout.



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John M

08-24-2007 03:14:16




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 Re: Bad Dodge transmissions ? in reply to ronnieblue, 08-23-2007 21:20:57  
I do know this, my uncle recently purchased a 2500 with a Cummins, like in March I think, it was an 02.Had like 40000 miles on it. Tranny went out, dealer blamed it on the previous owner not maintaining it properly. He had lots of problems trying to find the right tranny for it because it was what the dealer callled a Canadian tranny and had a hard time getting on for some reason. They ended up overhauling the old one.

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steve Dean

08-23-2007 22:05:28




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 Re: Bad Dodge transmissions ? in reply to Bob, 08-23-2007 21:20:57  
I would like to know this mans credentials. I have not heard a large amount of complaints on the overdrive autos in the 24 valves. The only issue I have ever heard with the auto since they came out with the first lock up converters, was that the torque converters would fail in time. I doubt that all of the ones that went bad were from pulling in OD. Common sense takes over if the truck is in a hard pull and your RPMs are way low in OD, why not put it in Drive until you level out? If you were in a manual, you would downshift to the next gear instead of lug it down. If you are going to be pulling a substantial load the majority of the time, I would upgrade to a beefier converter. They make several different ones that can handle a little more abuse. Just my opinion though. I would not be scared of the auto though

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Bob Kerr

08-23-2007 21:53:35




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 Re: Bad Dodge transmissions ? in reply to ronnieblue, 08-23-2007 21:20:57  
I know someone who blew countless flex plates out.Pulled a large gooseneck with it.They either cracked and on one he blew the whole center out where it bolts to the crank. Thrust bearings on engine were fine and checked by several deisel mech including a cummins mech. Verdict was just too much trailer and load. I don"t think he had any other tranny problems. His truck was the first style Dodge with cummins.

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suptscottyb

08-23-2007 23:33:02




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 Re: Bad Dodge transmissions ? in reply to Bob Kerr, 08-23-2007 21:53:35  
Yep, my wife killed the trans on a 2002 2500 hauling horses - in OD. (but it took 100,000 mi.)
Like Steve said - it takes a certain amount of understanding to haul with an automatic and OD.



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