1986 first year for one piece rear main seal? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ChaseDale3and8 · 03-22-2008, 02:02 AM

My dad is giving me a 350 out of a 1986 Chevrolet truck. I haven't gone up to pick it up, or even to look at it yet but I'm thinking that it will have a one piece rear main seal.

I want to build this one into a 383 and want to order the right crank for it. I found a one piece rear main seal steel crank for $170 shipped, but before I buy it I wanted to make sure that I was correct in thinking that 1986 was the first year for a one piece seal. Thanks guys. ...Joe

jermasaurus · 03-22-2008, 02:34 AM

I think 86 would be a mid year production for the one piece seal. Could probably be either or.

1966gmc · 03-22-2008, 04:13 AM

86 was the first year for the 1 piece main seal and also had a external weighted flexplate

sknights · 03-23-2008, 12:47 AM

It was also the last year for the 2 piece. 1986 was the transition year and came with both. My 86 has the 2 piece seal.

1966gmc · 03-23-2008, 01:55 AM

Both 86 blocks I've had were equipped with a 1 piece rear main

ChaseDale3and8 · 03-24-2008, 03:36 AM

Anybody know what the casting number/numbers are on one piece seal block? ...Joe

03-22-2008, 02:02 AM	#1
ChaseDale3and8 Registered User Join Date: Jun 2007 Location: Springfield Mo. Posts: 1,086	1986 first year for one piece rear main seal? My dad is giving me a 350 out of a 1986 Chevrolet truck. I haven't gone up to pick it up, or even to look at it yet but I'm thinking that it will have a one piece rear main seal. I want to build this one into a 383 and want to order the right crank for it. I found a one piece rear main seal steel crank for $170 shipped, but before I buy it I wanted to make sure that I was correct in thinking that 1986 was the first year for a one piece seal. Thanks guys. ...Joe __________________ I'm not speedin'! I'm qualifyin'!

03-22-2008, 02:34 AM	#2
jermasaurus Registered User Join Date: Dec 2004 Location: New Lenox, IL Posts: 442	Re: 1986 first year for one piece rear main seal? I think 86 would be a mid year production for the one piece seal. Could probably be either or. __________________ 79 Jimmy slammed AKA James Down

03-22-2008, 04:13 AM	#3
1966gmc Why does it taste purple? Join Date: Sep 2007 Location: Cambridge Md Posts: 621	Re: 1986 first year for one piece rear main seal? 86 was the first year for the 1 piece main seal and also had a external weighted flexplate

03-23-2008, 12:47 AM	#4
sknights Registered User Join Date: May 2007 Location: Idaho Posts: 4	Re: 1986 first year for one piece rear main seal? It was also the last year for the 2 piece. 1986 was the transition year and came with both. My 86 has the 2 piece seal.

03-23-2008, 01:55 AM	#5
1966gmc Why does it taste purple? Join Date: Sep 2007 Location: Cambridge Md Posts: 621	Re: 1986 first year for one piece rear main seal? Both 86 blocks I've had were equipped with a 1 piece rear main

03-24-2008, 03:36 AM	#6
ChaseDale3and8 Registered User Join Date: Jun 2007 Location: Springfield Mo. Posts: 1,086	Re: 1986 first year for one piece rear main seal? Anybody know what the casting number/numbers are on one piece seal block? ...Joe __________________ I'm not speedin'! I'm qualifyin'!



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