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10-22-2004, 08:31 AM
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#1
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Montana Master
Join Date: Apr 2004
Location: Maple city
Posts: 582
M.O.C. #1356
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2004 Dodge Diesel Owners
Okay, call me paranoid, but I have been dying to ask this question.
My new truck seems to double shift when I am excalarating to like get on the highway. It does it right around 50MPH. The only way I can explain it is just around 50mph it shifts and with a second or so it seems to do it again, but doesn't happen if I am just maintaing normal excalaration. Does that make sense??
Also, when I shut it off it shuts off really "hard" almost instantly. Is that normal?
Thanks in advance for any suggestions
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10-22-2004, 08:48 AM
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#2
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Montana Fan
Join Date: May 2003
Location: Ottawa Lake
Posts: 307
M.O.C. #321
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Sue what you might be feeling is the torque converter locking up this is normal for an automatic trans, second not sure about the way a cummins shuts down but my ford will shut down like that. Roman
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10-22-2004, 01:50 PM
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#3
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Montana Master
Join Date: Jan 2004
Location: Down the Road
Posts: 5,627
M.O.C. #889
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Sue,
went and asked the neighbor about how his Dodge shuts down and he said the same thing.. My Chevy is pretty quick on shutting down as well. Just keep an ear open when you are in a parking lot and listen to other Dodge trucks on how they shut down. Usually will find they are all the same.
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10-22-2004, 03:50 PM
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#4
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Montana Master
Join Date: Jan 2004
Location: St. John
Posts: 591
M.O.C. #800
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Sue; I was a little nervous about the extra shut down noise when I first got the Cummins. It was explained to me that the engine stops so quickly because of the compression that the belts slip a little. It is also explained in my Cummins owners manual. I've been driveing Cummins for almost 40 years but never heard this noise 'til this truck.
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10-22-2004, 04:30 PM
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#5
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Montana Master
Join Date: Nov 2002
Location:
Posts: 655
M.O.C. #36
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BP has it right, it's the compression of the diesel engine. A gas engine has a compression ratio of about 9:1 and a diesel is about 17:1. This causes a diesel to stop very fast while other components driven by the belt (alternator, power steering pump, fan etc.) try to continue turning. The result is the belt will slip slightly on the crankshaft pulley causing a chirp sound. It's certainly nothing to be concerned about.
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10-22-2004, 09:11 PM
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#6
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Montana Master
Join Date: Jun 2004
Location: San Antonio
Posts: 1,740
M.O.C. #1757
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Thanks for the great posting. Nice info to know. Happyrving....
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10-23-2004, 11:46 AM
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#7
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Montana Fan
Join Date: Jun 2003
Location: Wharton
Posts: 134
M.O.C. #381
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With the 48RE automatic, hard accelleration will yield a shifting of 1 - 2 - 3 (TC unlocked) - 3 (TC lockup) - 4 [OD] (TC unlocked) - 4 [OD] (TC lockup).
Yes, there'll actually be 5 shifts for a 4-speed transmission not counting the manual one into Low.
The abrupt shutdown, as others have said, is perfectly normal.
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10-24-2004, 10:20 AM
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#8
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Montana Fan
Join Date: Feb 2004
Location: Carlisle
Posts: 402
M.O.C. #908
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Like everyone says that extra shift you feel is the torque converter locking up. Also this is the 3rd Dodge cummins I've had and they have all shut down hard. It might be a little more noticeable on the cummins vs the Ford or Chev since the cummins is a 6 cylinder vs 8 so you're dealing with larger pistons and stroke.
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10-24-2004, 04:05 PM
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#9
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Montana Master
Join Date: Apr 2004
Location: Maple city
Posts: 582
M.O.C. #1356
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