Conflicting info on Rear Mail Seal..... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Shibbershabber · 09-15-2016, 03:51 AM

Okay, Im rolling an 86 C30, crew cab 454/2wd

Im getting ready to do a clutch soon and want to do the rear main while the tranny is out...

BUT, Is it only back there on a one piece seal? 2 piece seals require oil pan removal instead????

Id like to order everything ahead of time so its all here ready to go rather than waiting a week for something to arrive whilst the truck is all torn up.

Ive read that 1986 was the cutoff for the one piece and the 2 piece seals were only in pre-86 trucks... elsewhere I read the that was only SBC engines..... nothing solid on the ol' 454

I have a mfr date in December of 1985 but is 86 model year

is there another way to tell which seal you have?

Jake Wade · 09-15-2016, 07:21 AM

Your 454 has the 2 pc rear main seal. The SBC got the 1 pc seal in '86.

The 454 mark IV block with the 2 pc seal ran through at least '95

Shibbershabber · 09-15-2016, 10:15 AM

Thanks

83GMCK2500 · 09-15-2016, 01:40 PM

Quote:

Originally Posted by Jake Wade

Your 454 has the 2 pc rear main seal. The SBC got the 1 pc seal in '86.

The 454 mark IV block with the 2 pc seal ran through at least '95

Mark 4 stopped in '90, then 5 years of Gen V, '96+ engines are Gen VI block; V & VI are one-piece. Super Chevy has a decent article on the differences, this pic is from there.

Shibbershabber · 09-15-2016, 02:16 PM

Good stuff
Thanks

Looks like I'll put it off for later... or until it leaks

Jake Wade · 09-15-2016, 06:47 PM

I stand corrected on some of my information. Anyhow, yours is 2 pc, assuming it is a '86.

09-15-2016, 03:51 AM	#1
Shibbershabber Registered User Join Date: Sep 2016 Location: Vancouver, WA Posts: 18	Conflicting info on Rear Mail Seal..... Okay, Im rolling an 86 C30, crew cab 454/2wd Im getting ready to do a clutch soon and want to do the rear main while the tranny is out... BUT, Is it only back there on a one piece seal? 2 piece seals require oil pan removal instead???? Id like to order everything ahead of time so its all here ready to go rather than waiting a week for something to arrive whilst the truck is all torn up. Ive read that 1986 was the cutoff for the one piece and the 2 piece seals were only in pre-86 trucks... elsewhere I read the that was only SBC engines..... nothing solid on the ol' 454 I have a mfr date in December of 1985 but is 86 model year is there another way to tell which seal you have? __________________ 1986 C30 3+3 454 w/3spd

09-15-2016, 07:21 AM	#2
Jake Wade Registered User Join Date: Aug 2005 Location: Louisiana Posts: 711	Re: Conflicting info on Rear Mail Seal..... Your 454 has the 2 pc rear main seal. The SBC got the 1 pc seal in '86. The 454 mark IV block with the 2 pc seal ran through at least '95

09-15-2016, 10:15 AM	#3
Shibbershabber Registered User Join Date: Sep 2016 Location: Vancouver, WA Posts: 18	Re: Conflicting info on Rear Mail Seal..... Thanks __________________ 1986 C30 3+3 454 w/3spd

09-15-2016, 02:16 PM	#5
Shibbershabber Registered User Join Date: Sep 2016 Location: Vancouver, WA Posts: 18	Re: Conflicting info on Rear Mail Seal..... Good stuff Thanks Looks like I'll put it off for later... or until it leaks __________________ 1986 C30 3+3 454 w/3spd

09-15-2016, 06:47 PM	#6
Jake Wade Registered User Join Date: Aug 2005 Location: Louisiana Posts: 711	Re: Conflicting info on Rear Mail Seal..... I stand corrected on some of my information. Anyhow, yours is 2 pc, assuming it is a '86.



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