At 17 k miles, I checked the tranny fluid and it was low, at the bottom of the dipstick almost not touching. Filled it up, kept an eye on it for over a month and it remained full. On sat, 4k later, its 1/2 quart low. So today I took it to the dealership to have them check for leaks. Already told them it wasnt leaking bc theyre are no spot on my driveway. They checked and said there are no leaks. The service manager, which is my dads friend, tells me if its not leaking, it cant be using it. So I ask him to explain where its going and hes doesnt have an answer, other than it cant be using it bc its a sealed unit. Now, I m no rocket scientist but I do know how to check the fluid. And then he says if it is using it, he doesnt know why or what to do. Well, how bout a new tranny???? I have a feeling this is going to become a headache.

 

Are you checking it under the same conditions? It will make a difference if the engine is on or off, if you have driven it before you check it or not. Fill it to the proper point with the engine on, then go drive it around the block, then check and refill if necessary. When you check it after that, make sure you always start it up and drive around the block, then check the fluid on a level surface with the engine running. It will also make a difference in the level if the fluid is hot or cold.

 

Checking it when its hot, engine running on level ground. For over a month it was fine, checked it several times a week.

 

not trying to accuse you of anything but just wanted to be clear:
I have a tranny temp gauge. the transmission temp will take awhile to get warm. There's a big difference between the temp from driving around the block (warming up the engine) and driving it across town in rush hour traffic. Also the tranny won't cool at the same rate as the engine. Make sure that you are always starting with a consistent temperature.... again, I'm not being a smartass, just making sure that a simple detail (that may seem insignificant) isn't being overlooked. Good luck finding out what's happening.

 

My brother's Z71 was losing trans fluid and had no leaks. I didnt know what to tell him.
Ended up the trans cooler made into the radiator had a leak. It was going into the coolant. The coolant overflow tank told us what happened when the overflow tank was spitting out trans fluid and coolant.
Not sure if this is your issue, but I'd look in your coolant tank and check the color.

Jim

 

No worries, I ve been around the net a long time, kinda thick skinned by now.

At 17k miles when I discovered it was low, I filled it up and rechecked. Then I checked it 2 or 3 times on a 4.5 hr trip towing a 14ft trailer and 3 atvs. It was full, top of the dipstick.

The other day, when I checked it, I had been driving it around town probably 30 mins or so. So it wasnt just a dash around the block.

Ahhh tranny cooler, I ll take a look at that. Its going somewhere, I just need to find out where.