I purchased a 1996 Chevy C2500 from someone about 6 months ago. Didn't pay but about $1000, so I was expecting some issues. But it doesn't have too many issues. But it had a few times where it would jerk either when i've stopped then go, or you can feel the slippage in the trans. So I added trans fluid. after two days of driving it's empty. I don't have any leaks. Someone said it could be a vacuum leak and it could be going into my motor. He said if the oil looks clean that's where it's going. The oil looks normal when I changed it. It's not going into the coolant either. So I'm trying to figure out what could it possibly be. I'm so confused. It's been scanned and there aren't any codes.
Is it an auto or a manual?
probably an input seal leak. Try taking off the little cover on the bell-housing.
If so, then transmission's gotta come out.
I seem to have the same issue as the OP on a 2002 Mustang GT. There's no evidence of a leak and there's nothing getting into the coolant. I'm not sure of what the bell housing is - I'll have to research that. I'm assuming that taking the cover off will expose a leak.
Here is what I found ONLINE:
If you're losing fluid then it's due to an external transmission leak, a faulty vacuum modulator, or a leaking transmission cooler. No matter which one is behind this is needs to be repaired promptly as an automatic transmission can be damaged very very quickly due to a low fluid level
Low levels of transmission fluid or transmission fluid leaks are by far the most common type of transmission problem. Low levels of transmission fluid are usually caused by leaks in the transmission system itself. The seals in the transmission or driveshaft may become faulty and leak fluid. Occasionally, transmission gasket seals may need to be replaced to seal the leaks in the transmission. On some occasions, transmission fluid may be contaminated from coolant in the radiator. This is called cross-contamination and does occur on occasion.
I would try what Joe said off of this information something external with the seals and definitely have your mechanic check it out other than that, sad but true, its a 2 decade old $1000 Mercedes what would you expect {black}:serious:
Mercedes?
Mercedes C500 doesn't exist I guess lol Chevy C2500
Anyways info still applies to GM cars, their corporate mindsets and quality are similar
I was just reading about the vacuum modulator and it doesn't seem to have anything to do with loss of ATF.
If you have a vacuum modulator and its diaphragm breaks, transmission fluid will be sucked into the intake and burned in the engine. (I don't know if that transmission has a vacuum modulator, I'm used to seeing that on old-school hydraulic-control transmissions that have no electronics.)
It’s a 1996 Chevy C2500. I had to get the transmission rebuilt. Hard to find any for that old of a vehicle
I am with MMJoe on this. It's got to be either the transmission input shaft or the output shaft seal at the driveshaft. Hopefully, it's the output shaft seal which is a pretty easy fix.
