tranny problem??

[crash6x86]

anyways, im not sure what the heck is wrong here. well here it goes: 2000 Grand Scam GT 3.4/auto tranny. anyways, what it does: The car seems to jerk while at cruising speed, about 55-65mph. I usually drive about 60 miles one way a day. it jerks very softly. feels like a big gust of wind hit the car or it just hit a dip in the road. none of the two are happening during the drive because i notice it on a flat peice of road and there is no wind whatsoever. i look at the trees because there are a lot of them to make sure, and there were no vehicles passing me. it doesnt do it a lot, but it seems like it is doing it more often. maybe its just me.

I also look at the speedometer and tach to see if it fluctuates when this happens, but they dont move a bit. any suggestions??

In a week or two im getting the tranny filter/fluid replaced.

Not to mention, it does shift hard sometimes, especially in the morning.

[rixGAphx]

Seems like the 'OverDrive' (4 th 'speed') of the tranny is hunting in-and-out.
It's not really a separate 'speed' within the tranny, but rather a 'Torque Converter Lockup' that is operated by a clutch and shaft and stuff.

Anywho, there is an electric solenoid that gets its signal from the PCM (Poertrain Control Module, the engine/tranny 'puter).
This operates the Torque Converter Clutch (TCC) thru a large plug on the top front of the tranny.
Basically, a few inches just below the throttle body.

Since this is all-electric (no hydraulics, like most of the tranny), it can be affected by a minor problem in the alternator/battery/cables system.
So make sure everything there is clean and tight and shiny brite.

Are you having any other electrical gremlins that might SEEM unrelated?
The GA can be quite goofy when its electrical system isn't pristine.
** *

Or it might be a problem from low or dirty tranny fluid, which should be fixed by a simple fluid/filter change.

So, let us know how it goes after the tranny service, and after you service the batt/cables (don't just look at them: corrosion builds-up INSIDE the molded rubber boots; at 6-yrs old, you need to spend an hour taking those connections apart, cleaning, and re-attaching).

Good luck,
-Rick

[crash6x86]

yea, when i did my "tune-up" i cleaned them up. i also put a little dielectric grease on the grounds and the cables so they do not corrode(i forget how to spell that word). anyways, yea...i was thinking low tranny fluid too... i wasnt sure. so hopefully the filter/fluid would help out. any additive i should put in when i do the change?