automatic transmission doesn't up shift 2nd to 3rd
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Old March 16th, 2007, 04:36 AM   1 links from elsewhere to this Post. Click to view. #1
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automatic transmission doesn't up shift 2nd to 3rd


I have had this car now for about 3 or 4 months now. It's a 1999 mustang 3.8L V6 3 speed with OD base model so far as i can tell. I have been having an on going problem with my car not shifting from 2nd to 3rd under load. It started this about 2 months after i got it and i'm at a bit of a loss as to what might be doing this.

List of work I have had done in order:

full change out of front right brake (all of it)
transmission flush and filter change
new plug wires
oil and filter change

i know most of that probably doesn't help at all but you never know. anyway to the problem.
from a stop under normal driving the car shifts first second third then OD with no problems i can hear or feel but from a full stop if you try to accelerate fast it will go first second then stay there till red line and not shift, i have to let off the gas then it will shift right into 3rd with OD or into 3rd if i have OD turned off

if i'm driving and give it gas so it down shifts to accelerate it will do the same thing if the down shift is into 2nd gear the car will just red line with out up shifting if i don't let off the gas at all

the fastest I have ever had the car was up to 180Kph bad b4 this problem started. normal driving is from 110 to 120Kph and this is all highway just get up the speed and cruise


sorry for the long post i'm at a bit of a loss really as to what can be doing this and the shop i normally get the work done at doesn't really have any ideas also as this is not the normal kind of stuff they deal with. thought i would seek help online b4 taking it out of town to a transmission shop and blow a ton of money i don't really have lol.

Thanx for any thoughts or ideas
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Old March 16th, 2007, 01:37 PM   #2
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umm my second before my tuner shifted alittle into red line like 5.5k if it is getting to there and not shifting I would say get a shift kit and upgrade your Torque converter.
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Old June 28th, 2013, 04:36 AM   #3
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Having the same problem with my van


Howdy sorry to hear your having problems with your tranny. one of my dads friends owns a mechanics business. So the first thing you need to check is every ground wire that attaches to the frame or body, take them all off clean them with some emery cloth and then put them back. Also check the battery cables if they are corroded clean them and put them back. It is a fairly common reason the transmission doesn't want to shift, the resistance in the corroded connections causes the computer to not send the signal to the solenoids to shift your transmission. Secondly try Seafoam transmission flush and place a fuel filter in the line coming from your transmission cooler. Change the fluid a few times over the next couple of weeks, its easy to do just messy, in a lot of cases the little spools that shift the gears just get stuck, they fit in a very tight hole so if any grit or gunk gets in there they cant move to shift gears. Might as well try that before having work done. Just drive easy so you don't damage the transmission further. We bought our van and within a few days it quit working right and the car dealership screwed us they are making us pay for the repairs. Good luck!
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Old June 28th, 2013, 02:03 PM   #4
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This thread is from 2007. The OP has likely resolved the issue by now.
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Old June 28th, 2013, 02:12 PM   #5
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6 years!
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Old June 28th, 2013, 04:25 PM   #6
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this has to be the best thread resurrection known to man
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Old June 28th, 2013, 05:57 PM   #7
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^ no question!
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