Dennis Gerard
Well-Known Member
904 transmission pan gasket leaking anything I should know before pulling pan off and replacing gasket?
904 transmission pan gasket leaking anything I should know before pulling pan off and replacing gasket?
Is that on passenger side?Selector shaft seal, 'O' ring at dipstick tube, etc... can look like pan gasket leak too. Good luck
Dipstick tube on passengers side, Selector shaft, speedo input, and more on drivers side. My point is so many places above the pan can leak. The fluid runs down wicks along the pan gasket and pan. Of course the leak can be the pan gasket but it will pay to closely inspect for a higher source of the leak.
Check if your dipstick tube still has the single "0" ring type seal. When that "0"rings dries out the trans will leak.904 transmission pan gasket leaking anything I should know before pulling pan off and replacing gasket?
Hey TrailBeast, I am trying to hunt down a 904 leak that looks like its the pan but was not aware of the output shaft bearing seal. Is that accessible? How do I verify this seal is leaking or not? ThanksGet the rubber over metal gasket from the dealer for a 42RH or 42RE trans.
They seal really well and are reusable.
I know it's kind of a pain in the butt, but there is also a small metal plate that covers the output shaft bearing snap ring that is normally cork and leaks just under the trans mount.
These can look like a pan leak since it is so close to the pan.
(Just so you know it's there)
Hey TrailBeast, I am trying to hunt down a 904 leak that looks like its the pan but was not aware of the output shaft bearing seal. Is that accessible? How do I verify this seal is leaking or not? Thanks
Yiks that looks like it is right on top of the transmount. I guess I could feel for seepage up there but I would not know how to teplace that seal if indeed it is leaking.It's on the bottom side of the output shaft housing (and sometimes even under the trans mount)
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Yiks that looks like it is right on top of the transmount. I guess I could feel for seepage up there but I would not know how to teplace that seal if indeed it is leaking.
So looking at your red pointer I see drips coming from the two vertically stacked cast eye’s holes just below your pointer which looks like it could be that spot. Do you know the name or part number for that gasket?Yiks that looks like it is right on top of the transmount. I guess I could feel for seepage up there but I would not know how to teplace that seal if indeed it is leaking.
Those holes are for a factory floor shifter bracket. If the fluid is running down from the front of the holes it'd either the extension housing seal or the rear band shaft seal is leaking. To replace the rear band shaft seal you need to remove the extension housing and screw a 1/4" bolt into the pin and pull it out just far enough to replace the o-ring. Don't pull it out any farther than necessary to replace the o-ring or you'll let the rear band linkage fall apart insideSo looking at your red pointer I see drips coming from the two vertically stacked cast eye’s holes just below your pointer which looks like it could be that spot. Do you know the name or part number for that gasket?
After replacing the speedometer housing seals twice and a nee pan and factory gasket which is now sealed well I am still leaking at that floor shifter baracket holes. I am not an expert on trans and want to know more about the two places you are referring to. So is the first place you are mentioning large tail assembly gasket? I was told this trans was rebuilt but I am starting to doubt it.Those holes are for a factory floor shifter bracket. If the fluid is running down from the front of the holes it'd either the extension housing seal or the rear band shaft seal is leaking. To replace the rear band shaft seal you need to remove the extension housing and screw a 1/4" bolt into the pin and pull it out just far enough to replace the o-ring. Don't pull it out any farther than necessary to replace the o-ring or you'll let the rear band linkage fall apart inside
Yeah true enough. I have spent more time under there than my body can deal with.....Sometimes you practically have to camp out under a car to find the leaks.
Yes and I rarely see them leak. It's usually the rear band pin seal and it'll look like it's the extension housing gasket. You wouldn't believe how many times I've torn apart transmission that were supposedly rebuilt only to find their idea of a rebuild was to just pull the clutch packs and install new clutch discs and slap it back together. Not saying that's what was done with yours but it could beAfter replacing the speedometer housing seals twice and a nee pan and factory gasket which is now sealed well I am still leaking at that floor shifter baracket holes. I am not an expert on trans and want to know more about the two places you are referring to. So is the first place you are mentioning large tail assembly gasket? I was told this trans was rebuilt but I am starting to doubt it.
Yiks that looks like it is right on top of the transmount. I guess I could feel for seepage up there but I would not know how to teplace that seal if indeed it is leaking.
Hey RustyRat I did this. Yikes because I have 3 ruptured vertebrae and being on my back is difficult for me. I did this and also replaced the speedo housing seals twice. I also replaced the pan with a new one. I oowered thru this but I can’t begin to tell you how painful it was for me. I still leak and yikes I don’t think I can do anymore right niw as much as I want to.Seriously? Two nuts in the center of the crossmember hold the transmission mount. 4 bolts hold the crossmember in. Put a jack under the transmission, remove the aforementioned fasteners, remove the crossmember, then remove the two bolts that hold the transmission mount to the transmission then you are staring at the two phillips screws that hold the plat on. Remove those, remove the plate and replace the seal. reassemble in reverse order. Yikes?