the tranny on my 97 Tahoe dumps a cup to a pint of tranny fluid on the first start of the day. Doesn't leak when parked, even when parked for multiple days. Doesn't leak when hot. Doesn't leak when hot stopped or hot started. Only during that first cold start of the day. I'm stumped. Anyone else seen this symptom?
Tranny leak on cold start
- Thread starter ESTEBAN69
- Start date
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east302
Full Access Member
Where is the leak coming from?
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HiHoeSilver
Away!
This. Have someone else start it next time while you watch it. If there's that much, it should be obvious where it's coming from.
From the bell housing weephole. It only leaks on the morning cold start. Doesn't leak just sitting there, even for 7-10 days. Doesn't leak when hot. Doesn't leak on a hot start, even after an hour wait.
mizzouguy
Full Access Member
Does it leak on every cold start, even if you do not add to it to make it full again in between?
First thought was it could be overfull and pumping out the vent, then when it warms up and you top it off and repeat the cycle? Wrong/aftermarket dipstick?
First thought was it could be overfull and pumping out the vent, then when it warms up and you top it off and repeat the cycle? Wrong/aftermarket dipstick?
east302
Full Access Member
Is it leaking at the inspection plate near the oil filter?
Could be the front seal. If you have someone pull it to repair whatever it is, it'd probably be a good time to have the rear main seal done as well.
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Could be the front seal. If you have someone pull it to repair whatever it is, it'd probably be a good time to have the rear main seal done as well.
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Great suggestion! Thanks!!
I was really hoping that it was that simple a fix, but not so. Continued to dump a cup/pint out the bell housing weep hole on each cold start until it got to a level that it started slipping. Wrong dipstick is ruled out as the problem.
The mystery to me is why just on cold start? Why isn't it dripping when sitting for days? Why doesn't it drip when running? Why doesn't it drip when hot started? There's a clue to the cause somewhere in these questions. I'm just too dumb to see it.
