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  #1  
Old 09-06-2012, 04:15 PM
ehestdalen ehestdalen is offline
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Post 3500 Auto. Trans. - Hard Shifting

Re: 2011 Ram 3500, 50,000 km
Have been experiencing very hard shifting (frontend of truck jumps up) when transmission is shifted into reverse or drive after being driven for awhile and is at normal temp.. It almost feels like the transmission pressure is not dropping when changing direction. Last Friday my Chrysler dealer changed the transmission pressure transducer (4799758AD) but it did not change anything, they do not have any answers This problem is intermittent but serious enough that I'm concerned for my u-joints and even the transmission itself. Has anyone expereinced similar problems?

Thanks......eh
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Old 09-07-2012, 09:04 AM
TransEngineer TransEngineer is offline
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Have you noticed by any chance whether the engine idle speed is higher than usual, when you get the harsh engagement? A high idle speed will give you a noticeably rougher engagement.

Are the harsh shifts when going directly from Drive to Reverse (or vice versa)? Or is the truck idling for some time in Park or Neutral, and then getting shifted into gear?
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Old 09-07-2012, 09:06 AM
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gusman gusman is offline
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Mine kinda does that too. Especially in reverse the rpms drop way down and the truck vibrates like it wants to move so bad but my foot is on the brake.. I'm not so sure about these 68RE's
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Old 09-07-2012, 05:57 PM
ehestdalen ehestdalen is offline
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Default Ram 3500 - Harsh Trans Shifting

Quote:
Originally Posted by TransEngineer View Post
Have you noticed by any chance whether the engine idle speed is higher than usual, when you get the harsh engagement? A high idle speed will give you a noticeably rougher engagement.

Are the harsh shifts when going directly from Drive to Reverse (or vice versa)? Or is the truck idling for some time in Park or Neutral, and then getting shifted into gear?
Hi

The harsh shifts only occur once the transmission warms up and it's always into forward or into reverse from either neutral or from park. The engine rpm is normal and doesn't change. It's almost like the trans. pressure doesn't drop when it's signals to but the dealer changed the pressure transducer but nothing changed (maybe the new transducer is faulty?)

Thanks..........eh
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Old 09-10-2012, 09:11 AM
TransEngineer TransEngineer is offline
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Hmmmmm.....

I know the Cummins engine will go into a fast idle mode if you leave it idling (in Park/Neutral) for about a minute or so. But I guess that's not what you're experiencing.

You could try re-learning your garage shift adaptives. Get the transmission to the temperature range where you experience the harsh shifts. Then make a series of repeated engagements (maybe 15-20) at idle, pausing for a few seconds in Neutral and in gear, each time. See if that helps....
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