LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

Leaking front seal, transmission 91 Celsior

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Old 08-13-17, 07:25 AM
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Moarpower
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Default Leaking front seal, transmission 91 Celsior

HI GUYS. Today I found a rather severe leak at the front seal of the trans housing. Very sad about this. I am committed to the vehicle at this point so I will be dropping the trans when I can get a stand. It doesnt look like there is a gasket. SHould there be? Or should I just apply some liquid gasket compound?

Last edited by Moarpower; 08-13-17 at 07:32 AM.
Old 08-13-17, 12:09 PM
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Originally Posted by Moarpower
HI GUYS. Today I found a rather severe leak at the front seal of the trans housing. Very sad about this. I am committed to the vehicle at this point so I will be dropping the trans when I can get a stand. It doesnt look like there is a gasket. SHould there be? Or should I just apply some liquid gasket compound?
Since Banshee has had a few of them apart he would know more about that specific transmission than I. But in most cases there are usually three things that are gasketing or sealing the front of an automatic transmission. A front pump gasket that seals the intake and outlet for the pump to the case, and then a large usually square cross section o ring to seal the pump to the case. Then there is the pump to torque converter oil seal. And to answer the question you really don't want to use any sort of liquid gasket on an automatic transmission. Only thing I have ever used it on is an oil pan for them, and on nothing else.
The leak is likely from the seal or that o ring. Either way the transmission needs to be removed to fix it.
Old 08-13-17, 04:05 PM
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Moarpower
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Id say Id be looking at a pro repair of over 1200. If I cant do it myself Ill just keep the car off the road for a few months and do a manual swap. Hoping I can do it myself.

In the meantime ill drop the pan and take a look and service the trans as usual. I may ad a stop leak to get me to work until its sorted if its not too severe

Last edited by Moarpower; 08-13-17 at 04:13 PM.
Old 08-14-17, 03:13 AM
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Moarpower
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So I got a quote to replace the seals in the trans and the rear main and it was a shocking 1400 aud!!!!! # more and I can do a manual swap....So Im going to attempt it myself
Old 08-14-17, 03:14 PM
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Moarpower
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While waiting for the replacement parts I will be draining the pan and using a stop leak just to see if that junk actually works. Im not too optimistic. I will also be trying to figure out a way to do this safely on my own. Time to put my ghetto diy abilities to the test.

Last edited by Moarpower; 08-14-17 at 03:20 PM.
Old 08-16-17, 06:47 PM
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Tranny is not that heavy. I carried one into the garage that installed it in my UCF-10 (90 LS) . I was charged $460 or so and he did replace the rear main seal since mine is high mileage,
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