Author Topic: 2 piece rear main seal  (Read 898 times)

Offline 84GMCSierra

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2 piece rear main seal
« on: March 15, 2023, 06:29:31 AM »
I have a quick question. On my 84 Sierra 2500, with an aftermarket 350 and TH400, do I need to disconnect the transmission to do the rear main seal? I'm doing the oil pan gasket at the same time.
Thanks

Offline VileZambonie

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Re: 2 piece rear main seal
« Reply #1 on: March 15, 2023, 10:14:05 AM »
If it is in fact a 2 piece rear main, you remove the oil pan and rear main bearing cap.
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Offline gmcowner22

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Re: 2 piece rear main seal
« Reply #2 on: March 15, 2023, 11:10:31 AM »
Only time you should have to remove your transmission is if the engine has a one piece rear main.
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Offline JohnnyPopper

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Re: 2 piece rear main seal
« Reply #3 on: March 17, 2023, 12:59:41 PM »
I haven't seen a two piece seal since I rebuilt my '57 235 IL6, that was 45 years ago!

Surprised they used them for so long, but hey....right?
1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline 84GMCSierra

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Re: 2 piece rear main seal
« Reply #4 on: March 30, 2023, 10:44:59 AM »
Thanks everyone for your replies. I found out is a 2 piece so I know what I'm doing on my days off, lol