Question about Buick LeSabre

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The transmission front seal leaks fluid after driving the vehicle for at least 25 miles. The car is a 1995 Buick LaSabre with 3.8 litre engine., with automatic transmission.

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Use tranny stop leak or lucas oil in with the tranny oil. Are you using 40 weight oil?
If those don't stop the leak, which usually they do if the leak isnt bad, then the seal will have to be replaced.

Posted on Jul 15, 2010

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Posted on Jan 02, 2017

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What caused my transmission fluid leak and where could it be leaking from?


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I believe that I would take it back to the shop that replaced the modulator valve immediately. It sounds like they either left something loose, or didn't get a seal or gasket properly replaced. You definately run the risk of burning the trans up with it leaking that bad.

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There are at least 5 places on the Automatic transmission that can over time, and mileage develope fluid leaks. Front converter seal at the front of the transmission,pan gasket in the center,dipstick tube o ring at the center on one side ,speed sensor o ring,and the tail shaft seal at the rear,of the transmission.
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If the front seal(converter seal) is leaking the transmission will need removed,and the seal,and maybe even the front pump bushing Replaced,it would be a good idea to replace the bushing esp if it has high mileage,80,000 or 100,000 miles of use.Change the fluid and the filter,while repareing the leak or leaks.Is a good idea.

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It may be leaking from the transmission pan gasket or either of the transaxle seals. If it's leaking from the middle front of the transmission, it could be the front pump seal, if it's that, you'll have to remove the transmission to replace that seal. They others can be done with the transmission in the car.

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1 Answer

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Have you checked your transmission fluid level? (Motor running and in Park after driving couple of miles. )

If is not pinkish in color take vehicle to a tranny shop for service and diagnostic.

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Is a E4od Transmission(Ford) the same that is in my motorhome and in my f350 pickup truck,, 4 speed with OD? i have 1 1994 fleetwood bounder with a 460 ford and an e40d thansmission in it,, as well as my...


it might have just run low on fluid while driving,the front seal may not have been installed correctly,or the cooler lines or cooler might be plugged causing the trans to overheat which will cause it to leak a steady stream...for example,my 94 bronco with a e40d acted like that too when i worked it really hard pulling stumps out in the summer last year,it leaked out really bad until it cooled down,i put 20,000 miles on it since and it doesnt leak not even a drop.so mine was just overheated really bad.As for if it is the same between vehicles it is only if both trucks are a big block,and if both are 2wd.

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are u sure it isnt the rear transmission seal? they do wear out or sometimes they just go bad.if you drop the pan you will better be able to tell if its the seal or not.

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