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post #1 of 14 (permalink) Old 02-06-2006, 07:45 PM Thread Starter
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Question Hard downshift when stopping

1995 Intrepid 3.3 Base model
96,656 miles

Just bought the car today and I noticed this. When ever you are coming to a stop, like at a stop light the car will downshift kind of hard. Not soo hard that the whole car jaunts, but hard enough to fell a bump and annoy me. It had an ATF+3 change at 88,981 miles or about a year ago. I'm thinking about taking it to the dealer for an ATF+4 change and a scan of the transmission codes. I did this with my old 94' Intrepid, the ATF+4 seemed to stop the similar downshifting issues. Also, the transmission computer, should I disconnect the battery so the computer can 'reprogram' its self? I did that with a 1994 Plymouth Acclaim I had with the A604 overdrive trans.

Thanks in advance.
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post #2 of 14 (permalink) Old 02-06-2006, 08:15 PM
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check fluid level; disconnecting battery will not clear tcm codes.
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post #3 of 14 (permalink) Old 02-06-2006, 08:16 PM
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had that issue on my first gen, was told (never verified) that the trans mount maybe getting soft on it.
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post #4 of 14 (permalink) Old 02-06-2006, 09:46 PM
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I had a hard shifting issue with my car a few months after I had it in the dealer to have them change the fluid to ATF 4. I droped the pan myself and found that the trans filter and come loose. After I put in a new filter and refilled the trans myself with AFT 4 the shifting problem went away.
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post #5 of 14 (permalink) Old 02-06-2006, 10:03 PM Thread Starter
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thanks for the imput, I'll check the transmission mount in the morning, assuming its not raining.

I also have a friend with a Snapon Scanner that can read the current software, and if its possible to update it with newer software. It can also do a quick learn.

I'll be installing an external transmission cooler soon, so then I'll have the fluid changed with ATF+4.
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post #6 of 14 (permalink) Old 02-07-2006, 12:33 AM
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The dealer calls it bump shift.
You can get them to reprogram the computer to eliminate this.

I had it done on my 94 LHS.

These are relatively gutless, heavy cars with a deep first gear.
To make these cars more lively they will downshift to first at about 3 or 4 mph. If you roll through a stop sign you'll be taking off in 1st. Feels nice and snappy.

After the reprogram. You will need to almost stop to get first. Now when you roll through a stop sign to say 2 or 3 mph. You'll be taking off in 2nd. No more bumpshift but you'll understand the reason for the original program.

A torquey car with a relatively close ratio transmission do not have these issues. Mainly because they do not need to use first to adequately accelerate the car.
Anyone who's drove a 440 Mopar knows what I'm talking about.

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post #7 of 14 (permalink) Old 02-07-2006, 10:26 AM
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Or a 400 Firebird, 1st gear was useless in that car
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post #8 of 14 (permalink) Old 02-07-2006, 01:45 PM Thread Starter
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Thanks for all the input! Come payday, a dealer visit is on the list.
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post #9 of 14 (permalink) Old 02-07-2006, 08:29 PM
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Quote:
Originally Posted by jfsram
The dealer calls it bump shift.
You can get them to reprogram the computer to eliminate this.

I had it done on my 94 LHS.

These are relatively gutless, heavy cars with a deep first gear.
To make these cars more lively they will downshift to first at about 3 or 4 mph. If you roll through a stop sign you'll be taking off in 1st. Feels nice and snappy.

After the reprogram. You will need to almost stop to get first. Now when you roll through a stop sign to say 2 or 3 mph. You'll be taking off in 2nd. No more bumpshift but you'll understand the reason for the original program.

A torquey car with a relatively close ratio transmission do not have these issues. Mainly because they do not need to use first to adequately accelerate the car.
Anyone who's drove a 440 Mopar knows what I'm talking about.

my es doesnt downshift to 1st till dead stop. I wonder if they implemented these values in the TCM after they found what was wrong.

Or if autostick is the cultprit. I dont use D very much if at all. unless i have pop cans in the cup holders.

autostick downshifts from 4th at about 15 3rd at about 10 -5 then right after that 2nd and stays. untill dead stop
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post #10 of 14 (permalink) Old 02-07-2006, 11:59 PM Thread Starter
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I had a 1992 Escort (1.9 auto, mazda motor and trans) that would do something similar. Right before you came to a stop you'd feel a huge clunk and the RPMs would jump a bit.
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post #11 of 14 (permalink) Old 02-08-2006, 12:30 AM
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So if you don't have it "reprogrammed" will it ever develop into anything or will it just continue to be annoying?

edit: Does this all apply to a 98 Concorde?

Last edited by Leeser; 02-08-2006 at 12:37 AM.
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post #12 of 14 (permalink) Old 02-08-2006, 01:33 AM Thread Starter
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Quote:
Originally Posted by Leeser
So if you don't have it "reprogrammed" will it ever develop into anything or will it just continue to be annoying?

edit: Does this all apply to a 98 Concorde?
Keeping in mind that these are electronically controlled transmissions. It's possible it will get worse, but it usually leads to immediate failure, as with any electronic component. There really is no inbetween. It either works or it dosn't. I'm guessing my current Intrepid has the original 1995 software on it, and my old 1994 had the latest software, plus fresh ATF+4.
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post #13 of 14 (permalink) Old 02-08-2006, 08:33 AM
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Just to add to the confusion. I had the bump shift on mine also. Mine turned out to be a bad TCM. Had a bad solider joint on the board. But I had all kinds of other weird problems along with it.
One tip, if the dealer puts the scanner on it and says the pressures are off, don't take it for the real problem.
The dealer and another trans shop that later fixed the problem checked the pressures (shift pressure check is the standard thing they do) and said they looked bad. After they rebuilt my trans, found that was not even the problem and it didn't need it. Turned out it was the TCM.
Probably would not apply to yours, but just wanted to share the info..
If possible I think I would ask a shop to try a replacement TCM if they had one on hand before a rebuild, if the transmission did not have a lot of miles and abuse on it anyway.
A sticky valve pack can also cause shift problems.

Last edited by dodgerunner; 02-08-2006 at 08:36 AM.
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post #14 of 14 (permalink) Old 02-08-2006, 09:42 AM
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I had my tranny repaired when the car was still under factory warranty. When I came to a stop and then accelerated the engine would rev but no wheel turn. Then after maybe 2 seconds the car would squeal away as the tranny jerked into motion. I think the car was at or under 30,000 miles at the time. I canít remember what they did but parts were replaced and the software was upgraded. Only when its freezing cold out and the tranny is still cold does it do this but no where as bad as before the fix....knock on wood.
I'd go to the dealer and see what they can do and also, try to drive normally.
I'm in the habit of very slow acceleration down the road when its cold in an effort to make things last as long as possible. I want to run this car till the wheels fall off but if the drive train goes I'll be forced to junk her...Donít like to talk about that.
I also get the transmission flush thing from the dealer every once in a while. Itís like $100 and I think it has helped.

-GB49
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