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Re: leaking rear seal on transmission
If you are talking about the seal at the rear of the tranny where the drive shaft goes into than it is fairly easy. 1.put something behind both tires so the vehicle does not try to roll away when you complete step 2. 2.take the drive shaft down. 3. take a flat head screw driver and a hammer. 4.take the screw driver and put it in the crack where the seal and tranny meet. 5.you will need to tap the screw driver into the crack until you can get a good grip on the seal with the screw driver. 6 you will need to pry out on the seal until you see it move. 7.do this all the way around until you can get the seal out. 8.make sure nothing is in the way of you putting in the new seal 9.put a little bit of tranny fluid on the new seal. 10 put the seal in place and lightly tap the seal. into the tranny. 11. put the drive shaft back together.
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How long has it been leaking? If the transmission ran low on fluid for some time, that could lead to big trouble. If it was kept above the add mark at all costs, then a seal or gasket should end your worries. The location of the leak is important. If it happens to be a front shaft seal that leaks (fluid would be gathered behind the lower inspection plate, on the bottom front of the transmission), then the transmission would have to be pulled out to replace that seal. But other leaks like a pan gasket leak is pretty easy to fix.
Before taking this job on yourself, call a few local transmission shops as found in the phone book and ask them for a price to replace the rear seal on the transmission. Lots of work and a lift is ever so handy in doing this type of job. Now when you tell them what you want, have them say it back to you. No matter what you actually say, they will give you a ballpark price to replace the rear seal on the engine to fix an oil leak cause that is what they heard you say. You want to replace the rear seal on the transmission, to fix a transmission fluid leak. This is much cheaper job than the seal on the engine.
Failing that buy a cheap service manual on CD over on eBay and do a search on www.youtube.com, some nice guy has probably put up a video of a rear seal change on a GM transmission product and they are all about the same.
If you have a minor leak you may be able to cure it with AT205, a seal swell made by the ATP company. I have seen this seal swell do miracles with many different fluid leaks - it is not cheap but if it can't fix it, only a wrench can!!! I suggest adding at least 2 pints to your motor and see if it stops it. Failing that, the job is relatively easy if you have a lift and the proper tools. If no lift, but a concrete floored garage, it is not so bad with a rolling floor jack. Alignment is always a problem so removing the bolts for the motor mounts and having 2 rolling jacks will help lots - although I do not envy you this job! Thanks for using Fixya!!
If you haven't done one before. I would get someone who has and watch how it is done, don't want to be strained in the driveway shaking your head. It would be a good idea to pick up some bearings and do both sides as well as both oil seals.
if you did it yourself then you probably didnt put transmission fluid on the seal before you put it in the housing. take it apart( i know its a pain but its the only way to fix it) this time spread with your finger fluid on both sides of the seal. then use a sealant around the housing when you put the plate back on. this should solve the problem.
Is it a 4x4 if it is you would have to seperate the tranny from transfer case and drive shaft tp change out seal.If not just drop the drive shaft and replace seal.We are talking about the rear seal at the end of the tranny.
not hard to change out that oil pan gasket tip- just think of it as a simple job nothing can go wrong you can do this i promis-----its not the rear seal its the shocks and struts common tell tell signs-get new ones before its tooo late
Your rear engine seal is probably shot. I wish I could tell you that it's an easy job to fix. You "could" try some of that engine stop leak stuff which is supposed to repair dried out seals, but I have never had luck with that stuff.
You'll probably need to get the seal replaced, which involves pulling the transmission off. Luckily its a rear wheel drive truck - it's no where near has hard as a front wheel drive!!