Tranny slips up hill

[Nick_Wa]

Well, went to leave this morning and leaving my parking garage there is a 30 foot long hill about 30 degree slop id say. Turned out of the garage to go up the hill and it said low traction and then i sort of just came to a stop, so i tried to go again and nothing. Backed up and tried again and then realized the tranny would slip out of gear. Id move ahead 3 or 4 feet then would slip out. I have NEVER had any problems with it whatsoever, it was fine leaving yesterday, driving around and everything and now all of a sudden it does this. Any ideas? I had no problems driving on the flat ground in my parking garage before or after trying to make it up the hill. Thanks.

[GrandAm2000se]

doesn't neccesarly mean a transmission problem, it could be something to do with maybe to tc or tcc who knows... But, this is extremely bad, and when was the last time you have the transmission fluid changed? saying that, how many miles are on your transmission?

[rixGAphx]

The 'Low Traction' was the system behaving normally to a sloped driveway with black ice; the tire spins, and the computer backs-off the fuel injection to throttle-back the engine.
Even though you are FLOORING the pedal for power, it feels like it's slipping because the computer, being smarter than you, isn't injecting very much gasoline and thereby saving your butt from crashing into the Lexus in the next stall.

:D :D
It's likely that a Jeep in 4wd 'Lo' with locked differentials couldn't climb that icy slope, unless it had studded tires to grip the ice.

Are you certain that the rest of the 'tranny-problems' weren't also slip-related?
Garages are notorious for thawing in the daytime, then freezing overnight at the bottoms of ramps as cold air flows downhill and ices-over the water that collected there the previous afternoon.

Additionally, the tranny is rather inefficient when it's cold.
It has its own internal Fluid Temperature Sensor, and it adjusts itself for less-than-optimum performance until it reaches operating temperature (the thick, cold fluid might blow-out seals if it were pumped at full pressure).
Your cold, inefficient, just-started tranny, combined with some icy conditions, could have created this weird condition, which may never be repeated.

You *may* have blown a seal inside the tranny (which would be real bad), but I don't think so based on your last phrase, "I had no problems driving on the flat ground ... after trying to make it up the hill."

I would ignore this one incident for the moment, and just consider how the tranny is operating, when warm, the rest of the day.

Plus make sure the tranny fluid is fresh and the level is proper as GA2kSE says.

Hope this helps,
-Rick

[GrandAm2000se]

My mechanic at work told me that you have a bad TC, so i wouldn't necessarily buy one right away, but see if it happens again, then the TC is bad.

[Nick_Wa]

Yeah, I am goint o ignore it for now because no other problems or issues with it whatsoever. I knwo it was the tranny because the pavement was dry and full of salt. But if it happens again I will check about the 'tc' and get a filter/fluid change. Thanks guys.