Hard shifting tranny

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fishguy - 14 Sep 2006 21:38 GMT

I recently bought a used 95 GMC Sonoma extended cab pickup truck (4 X
4). I have noticed that after driving it and warming everything up that
the transmission shifts hard between 1st & 2nd gears. I have noticed
the fluid is a little overfull and appears dirty. Does any one think a
dirty filter is the cause of the hard shift. Or is there an accessible
part that can be replaced when I have the pan off to change the filter
that is obviously the cause. It also has the 4.3 vortec. Auto
transmission and A/C.

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Paul - 15 Sep 2006 13:53 GMT

Dirty filter affects line pressure / could cause hard shifting. Worn
trans fluid [ thermal breakdown ] could do the same. Trans service is
cheap insurance against rans failure.

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fishguy - 16 Sep 2006 02:37 GMT

> Dirty filter affects line pressure / could cause hard shifting. Worn
> trans fluid [ thermal breakdown ] could do the same. Trans service is
> cheap insurance against rans failure.

Thanks Paul,

You confirmed my suspiscions. I changed the filter and fluid today, I
also added a quart of slick 50 tranny treatment. I've driven it twice
today. The first time there was an immediate improvement. The second
time was even better. I suspect the new filter is cleaning the
remaining fluid in the torque converter.

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