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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 84GMCSierra on March 15, 2023, 06:29:31 am

Title: 2 piece rear main seal
Post by: 84GMCSierra 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

Title: Re: 2 piece rear main seal
Post by: VileZambonie 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.

Title: Re: 2 piece rear main seal
Post by: gmcowner22 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.

Title: Re: 2 piece rear main seal
Post by: JohnnyPopper 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?

Title: Re: 2 piece rear main seal
Post by: 84GMCSierra 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