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  #1  
Old 02-08-2015, 10:39 AM
shadango shadango is offline
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Default Trans delayed downshift up hills????

Some time back I had complained to my dealer of a delayed down shift when going up a hill, slowing down and then turning up another hill….the tranny seems “stuck" in a higher gear…..then as you feather the gas it abruptly lurches in to a lower gear.


There are two or three places in my commute where this happens frequently and it is very annoying. Also seems to happen sometimes when merging with traffic on the turnpike…slowing down in the merge lane, then gassing to merge.



Wondering if anyone else has experienced this and if there are any trans computer updates that may correct this behavior at this time?
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  #2  
Old 02-08-2015, 10:59 AM
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(hemifever) has tuned my Ram with a custom dyno Diablo tune. I also run a Sonnax line booster. I couldn't be happier with the way it shifts. Might be worth talking to him. Mine is an 05 with the 545RFE, so may be different with your 645, or not.
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Old 02-09-2015, 07:45 AM
TransEngineer TransEngineer is offline
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Easiest "fix" is to manually tap it down a gear using the Electronic Range Select (ERS) shift control.
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Old 02-09-2015, 04:57 PM
huntergreen huntergreen is offline
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the simplest fix is usually the best. i would listen to Trans.
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Old 02-09-2015, 06:15 PM
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My Ram is a 2009 model & i have noticed that one location in particular, where this one hill gets steeper & i am using Cruise Control. My Ram does two things at once, the Speed Sensor allows the MPH to drop about 5 MPH & the MDS disengages. The transmission shifts down just as the engine starts using all 8 cylinders.
When i reach that point on the hill, i feel almost a violent G force change & my Ram takes off like a bullet !!!
You don't want to be next to a police car when that happens, you will definitely get the officers attention
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Last edited by GTyankee; 02-09-2015 at 06:19 PM.
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Old 02-17-2015, 03:06 PM
shadango shadango is offline
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Quote:
Originally Posted by GTyankee View Post
My Ram is a 2009 model & i have noticed that one location in particular, where this one hill gets steeper & i am using Cruise Control. My Ram does two things at once, the Speed Sensor allows the MPH to drop about 5 MPH & the MDS disengages. The transmission shifts down just as the engine starts using all 8 cylinders.
When i reach that point on the hill, i feel almost a violent G force change & my Ram takes off like a bullet !!!
You don't want to be next to a police car when that happens, you will definitely get the officers attention
Exactly right! It can be downright dangerous...

I guess I can try manually downshifting....

But its an AUTOMATIC tranny.....shouldnt have to....LOL
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Old 02-17-2015, 05:07 PM
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I drove several 3 axle vehicles over the years
About once a year all the drivers & mechanics had to attend a Equipment Class

One of the main things that i remembered was that an Automatic Transmission of any size, needs help shifting at certain times. ( yes we had automatic transmissions in some very large trucks & construction equipment )
For instance, if you have a fully loaded 10 wheel dump truck & you are beginning your haul out of a sand or rock pit, you have to manually select a gear that allows the engine to have enough power to begin rolling without much of a strain & still have enough throttle to allow a build up of speed to shift into the next higher gear.
In other words, you don't put the transmission into the highest gear & let the computers do the shifting. Your vehicle would be in the equipment shop almost as much as i would be on the road & you would be looking for another job
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Old 02-17-2015, 06:47 PM
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Sorry! Got to disagree with the previous post.
No modern 1/2 ton computer controlled pickup 'needs' shifting help from the driver.
If it did, that would be really,really poor on the Mfg's part.
The engine's torque curve is already known by the Mfg, the computer already knows the engine RPM, airflow, MPG, temperature, speed, tranny gear, throttle position, speed deviation, calculated octane, the list goes on...
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Old 02-18-2015, 08:25 AM
shadango shadango is offline
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I agree Red STripe.....I am not experiencing this while towing or hauling necessarily (though I am sure it does it).....I am experiencing it while driving at speed already.....

I have noticed a similar lag in my 72 barracuda with a 727 tranny....but that is a 3 speed and is 40 year old technology.......and there isnt the lurch that I get with the Ram.

I also have a "whine" that I hear when driving in traffic at 40 mph, off the gas, just "coasting".....but as I recall that is "normal" for this truck.
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Old 02-19-2015, 01:41 PM
whiteknight312 whiteknight312 is offline
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Its because of the economy mode its stuck in. the Hemi tuner plus does nothing for this. it works on fast shifts only. so unless someone messes with the shift computer to hold gears as you are going up hills. yeah we have to keep it in 3rd all the way up and then hit 4th. sucks, but....
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