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  1. #1

    Default Rear Main Seal Leak Please help!

    I have a 99 silverado, and it has a steady leak from the rear main seal, i know that its a couple hundred bucks to get that fixed at a shop. And I'm a little hesitant to drop the transmission to replace the seal. I saw some engine oil additive or something that said it repairs the rear main seal to stop the leaks. I think is was called No Leak. I was wondering if this stuff worked and what brand to buy, because i noticed some other brands like Bar. Thanks!
    1999 Silverado 4.8L V8 2WD
    6" suspension lift by Fabtech
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  2. #2
    Legend unplugged's Avatar
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    Default

    All of those stop leaks prey on one's desire to avoid expensive repairs. I've used my share of Bar's Leaks, Wynn's, K&W Block Seal, Motor Honey etc. By and large, most do little to help. Then again they are typically less than $10 so what's the harm. Just start setting aside the money for the repair and don't let it go too long. It's a hand grenade and the pin has been pulled.
    There is no way to happiness....happiness is the way.:yipi:
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  3. #3

    Default

    I know times are tough and moneys scarce out there but I gotta agree with unplugged on this.
    I used Bars Coolant System Stop Leak years ago as an emergency fix to get home, it was only 150 miles, by time I removed the radiator it had plugged up the radiator and cooling system causing the truck to overheat and warp the heads.
    So in a lubrication system just what does this stuff do? its designed to fill in a leak, lubrication systems need to keep oil flowing to be effective.

  4. #4

    Default

    The engine stop leak has a chemical which softens the rubber in ALL the rubber type seals in your engine. It may or may not work but it's worth a try since letting it leak may damage the engine if left to leak. Once the leak stops change your oil right away.
    I have a friend who stopped his front axle seal leak with this stuff so I know it works on rubber type seals.
    Jim

    2004 SILVERADO 2500HD LS
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  5. #5

    Default

    Thanks guys. I figured it wouldn't be the best thing for my truck, but it didn't hurt asking. I think I'm going to wait till Christmas break and drop the transmission to replace the seal.

  6. #6

    Default Rear Main Seal Leak in 99 Tahoe (with 350)

    My wife has a 99 Tahoe with the 350 block in it. It has a fairly major rear main seal leak and I have looked into replacing it. I have replaced the seal on other chevy small blocks and typically they are two-piece seals allowing for this to be done without removing the crank shaft or decoupling the transmission.

    I have searched everywhere but I can only find the seal as a one-piece replacement. Does anyone know of where I can get a two-piece seal.

    Thanks

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