oh where, oh where, has my transmission fluid go?

[Fenvy]

this is not the 2nd time it happened

basically I measured 2.4l of redline mt-90, dump it through the shifter hole... tada! good shifter.... after a few months, it starts to grind alittle, to my surprise, 1/4 of the redline disappeared!

so I filled it up again, this time I opened the fill nut so I know I topped it off. I closed the fill nut after I fill it up, tada! good shifting again but few months down the road, it grinds sometimes. Again some of the transmission fluid is gone...

what gives? I am not leaking transmission fluid as far as I Can see... my transmission bellhousing is clean, I checked drain nut, fill nut, shifter plate, there is no evidence that suggest I am leaking transmission fluid, so where did all my transmission fluid go?

[FliMSiCaL]

u check the driveshaft end?

[Ender_Zero]

like flimsy says, its probably a bad seal at the back of the transmission where the driveshaft goes in if all the other spots are clean

[bcar240]

That happen on my '90. IIRC, someone said that the rear driveshaft seal had a tendecy to wear oblong on those cars. Not sure about newer ones though.