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Old 03-16-2015, 10:08 PM   #1
Firehawk409
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Rearmain seal leaking

It looks to be leaking but not much. I'm sure most of it is from my slave. I'll soon be replacing my clutch and might as well replace it to. So, my question is, do I just replace the seal or the whole housing? It's an 05 GTO.
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Old 03-18-2015, 09:35 AM   #2
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Alright guess no one is here.
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Old 03-18-2015, 09:13 PM   #3
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I always replace the cover with seals and bolts when I pull the tranny of a car. I think it's like $48 for the kit
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Old 03-19-2015, 07:21 PM   #4
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I agree, replace the whole cover. Make sure you install it with the alignment tool.
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Old 03-19-2015, 09:04 PM   #5
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I just did this. I bought a new rear cover with bolts and gasket off amazon. The new cover came with a clear cover that you line up with the crankshaft snout and simple slide it in place. I used a little tiny dab of the Right Stuff sealant around the corners of the oil pan.
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Old 03-19-2015, 11:40 PM   #6
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So the one on amazon comes with the alignment tool? I'm guessing i need to pay special attention to the oil pan gasket? Im having flashbacks from my old lt1. Lol
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Old 03-20-2015, 07:45 AM   #7
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Informative thread right here. Since my '04 has finally shown signs of leaking, the past few months. Nothing too drastic, but I know what to be on the lookout for.
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Old 03-20-2015, 09:03 AM   #8
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Quote:
Originally Posted by Firehawk409 View Post
So the one on amazon comes with the alignment tool? I'm guessing i need to pay special attention to the oil pan gasket? Im having flashbacks from my old lt1. Lol
Not an alignment tool but a plastic cap that is the size of the crankshaft flange. The cap is already sitting inside the rear main seal when you open the box. so you just position the cap on the crankshaft flange and slide the whole engine cover to the back of the block. As you slide the cover back, the cap will remain on the crankshaft and you just take it off.
Amazon.com: Genuine GM 12639250 Crankshaft Oil Seal Housing, Rear: Automotive Amazon.com: Genuine GM 12639250 Crankshaft Oil Seal Housing, Rear: Automotive


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Old 03-20-2015, 11:54 AM   #9
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Great video on the subject that will help you line up the rear cover so you're less likely to have future leaks.

https://www.youtube.com/watch?v=mzkD1_b_LAs
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Old 03-20-2015, 02:19 PM   #10
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Quote:
Originally Posted by geddy2112 View Post
Not an alignment tool but a plastic cap that is the size of the crankshaft flange. The cap is already sitting inside the rear main seal when you open the box. so you just position the cap on the crankshaft flange and slide the whole engine cover to the back of the block. As you slide the cover back, the cap will remain on the crankshaft and you just take it off.
Amazon.com: Genuine GM 12639250 Crankshaft Oil Seal Housing, Rear: Automotive


Is that the kit you bought? The other ads on amazon state they come with bolts and seal. This one doesn't say that. I see a Dorman kit and an APDTY kit.
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Old 03-20-2015, 09:02 PM   #11
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Originally Posted by Firehawk409 View Post
Is that the kit you bought? The other ads on amazon state they come with bolts and seal. This one doesn't say that. I see a Dorman kit and an APDTY kit.
Yes, this kit comes with everything. New rear engine cover, new cover to block gasket, new bolts and new rear main seal already installed on the cover.

if you watched the video, towards the seal install, the installer took out an uninstalled seal that has that plastic center cover that goes over the crank. that is the cover i was describing. The differences with the Amazon link is the rear main seal is already installed on the engine cover, so you just slide the whole engine cover with the seal and gasket over the crank shaft and follow the torque sequence. No need for that rear engine cover centering tool.
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Old 03-20-2015, 11:32 PM   #12
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Aaahh.. Okay. Sounds good. I'll go ahead and order that kit when it comes time.

Thanks for all the info and help.. My ole lt1 just has me a bit spooked when it comes to oil leaks and gaskets/seals. Good info and the right tools definitely made the job easier and leak free when it came to the lt1. Any corner cutting and you got a mess on your hands.

Last edited by Firehawk409; 03-20-2015 at 11:36 PM.
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