harsh 1-2 shift
01-02-2012, 09:08 PM
#1
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harsh 1-2 shift just wanted to know if anybody else was having harsh 1-2 shifts durring light throttle on my second tranny and still have the shifting issue.
01-02-2012, 09:27 PM
#3
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Yes, as I'm rolling through campus going 10-20 mph, it feels like I've been rear ended when it shifts from 1-2. It seems like a fairly common thing with the 4L60E's in these cars, my friends '99 Trans Am does it as well. As long as it's not slipping or hesitating, everything should be fine with it.
01-02-2012, 09:27 PM
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car was doing it prior to the tune trsnny is a built 4l60e with stage 3 shift kit but was doing it while everything was stock form and after new trans mount
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01-03-2012, 09:06 AM
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Did you scan for codes? there could be an 1870 code stored in the computer. If it is real harsh at light throttle and it feels like something can break there is a problem for sure.
01-03-2012, 12:25 PM
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Some faults will make it shift hard & early, and may
not set a code if intermittent enough. The shift kit
usually firms up shifts and maybe this was excessive.
Especially if somebody also upped shift pressures in
the "street tune".
If you can look at force motor current, see if it is
bottoming to 90mA or 0mA (commanded full pressure
during shift). That would implicate a fault if it's at
part throttle.
not set a code if intermittent enough. The shift kit
usually firms up shifts and maybe this was excessive.
Especially if somebody also upped shift pressures in
the "street tune".
If you can look at force motor current, see if it is
bottoming to 90mA or 0mA (commanded full pressure
during shift). That would implicate a fault if it's at
part throttle.
01-03-2012, 02:50 PM
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check to see if your 1-2 accumulator piston or spring is broken. the 1-2 usually does have a little bump to it but a bang is different. if its a bang then check that out first.
02-20-2012, 08:22 PM
#13
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Mine was doing the same thing. harsh shift from 1st-2nd and shifting into overdrive sometimes. I just took it to the dealership and they said it was the 1,2 accumulator and that also should fix the overdrive problem too. i should know in the next day or so.
