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Old 12-20-2004, 04:09 PM
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Rear main seal

I think my rear main is leaking so I thing Iam going to replace it on my 350 /78 vette.Do you think I could do the job just by using floor jacks I have no car lift in my garage.

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Old 12-20-2004, 04:20 PM
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floor jacks---- no way

my dear friend. yes you can change the rear seal at home. you need to get the transmission out to get at the rear seal. but dont trust floor jacke to hold the car while you are under it. get some jack stands or large blocks of wood under the tires. you will be safe this way. good luck.
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Old 12-20-2004, 04:23 PM
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I`m not sure if clearence permits under a vette, but if it does and if the engine has a few miles on it, replaceing the seal likely won`t help any. I`ve replaced many in the past only to have the leak commence afterwards or not long there after. Unless it`s a severe leak, I wouldn`t bother with it. but if you decide to, make sure you set the seal off set, don`t let it line up with the cap seams, also seal the ends together, but be careful not to let the sealant find it`s way onto the seal itself. Also coat the seal with vaseline and let it absorb it, it helps the seal to retain moisture and have a longer life. No offense tucker, but all the rear main seal`s I`ve replaced I didn`t remove the transmission.

Last edited by DoubleVision; 12-20-2004 at 04:29 PM.
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Old 12-20-2004, 04:24 PM
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Very doable but as Tucker said USE JACK STANDS. Way too many stories of cars falling on people that used just a jack.
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Old 12-20-2004, 04:48 PM
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Yes, a very good friend was working on his Mustang. Up on two jacks. After a few hours of laying under the car. His wife found him. The para-medics ruined the front sheet metal getting the car off him. All he suffered was two broken ribs/bruises. So use those stands. He does, NOW!

Most Chevies, till 87, change rear seal with flywheel on. Providing you can get oil pan to car clearance.
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Old 12-20-2004, 04:51 PM
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Be careful that you do not slice the seal on install.If you have a late model engine you have to pull the tranny because of a one piece rear main seal.On the 78 if it is the original, the tranny can stay in.
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