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Old 08-11-2006, 08:48 PM   #1
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Join Date: Feb 2000
Location: Winston salem, NC
Posts: 2,850
Car: 1987 1SICIROC.....1999 TransAm
Engine: 385 HSR.....LS1
Transmission: 700R4 with Midwest 3400 2.4str...M6
Axle/Gears: SLP Zexel Posi unit 3.42's...3.73's

Classifieds Rating: (4)

Do I have a 1 peice or 2 peice rear main seal?

Its an early style block..3970010 block..is that a 1 piece or 2 peice rear main? Its for my 383 and Im looking for a flexplate for it and want to get the right one...I know I need a 153 tooth plate..my motor is internally balanced and I already have the 7 1/4 fluiddampr on the front...

When I ask the parts people for a flexplate they ask me if I have 1 or 2 rear main seal....I have not clue.

Im thinking I got a 2 piece?


help!...LOL

thanks!
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Old 08-11-2006, 08:55 PM   #2
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Join Date: Apr 2005
Location: Baton Rouge, LA
Posts: 1,147
Car: 89 RS
Engine: 305
Transmission: th350

Classifieds Rating: (3)
Its a 1 piece rear main seal block. 69-80. They dident change to a 2 piece till 86.
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Old 08-11-2006, 09:22 PM   #3
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Join Date: Sep 2005
Posts: 14,893
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere

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010 is a 2-piece block.

The 1-piece was introduced in 86.

The other guy got the years right, but the seal designs backwards.

So you're right, you need a flex plate for a 2-pc style block.
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Numquam ponenda est pluralitas sine necessitate.
William of Ockham, c. 1330 AD, from Quaestiones et decisiones in quattuor libros Sententiarum Petri Lombardi

Roughly paraphrased into modern English, and applied to figuring out what's wrong with your car:

The simplest explanation that fits all the facts is probably the right one.
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Old 08-11-2006, 09:55 PM   #4
Supreme Member
 
Join Date: Feb 2000
Location: Winston salem, NC
Posts: 2,850
Car: 1987 1SICIROC.....1999 TransAm
Engine: 385 HSR.....LS1
Transmission: 700R4 with Midwest 3400 2.4str...M6
Axle/Gears: SLP Zexel Posi unit 3.42's...3.73's

Classifieds Rating: (4)

ah, OK..I'll take your word for it...so****indumb..LOL!!!!whoops I mean sofakingdom!!!

Should I just get a stock one..or would I benefit from a lighter one if they even make one...

thanks guys!!!
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Old 08-11-2006, 10:00 PM   #5
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Join Date: Sep 2005
Posts: 14,893
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere

Classifieds Rating: (1)
The stock one is about as light as they get; a little TOO light for a performance buid IMHO; you'd probably benefit from a little better one.
__________________
Numquam ponenda est pluralitas sine necessitate.
William of Ockham, c. 1330 AD, from Quaestiones et decisiones in quattuor libros Sententiarum Petri Lombardi

Roughly paraphrased into modern English, and applied to figuring out what's wrong with your car:

The simplest explanation that fits all the facts is probably the right one.
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Old 08-11-2006, 10:03 PM   #6
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Join Date: May 2006
Location: New Jersey
Posts: 111
Car: 88 Firebird
Engine: 5.0 ltr
Transmission: 4L60
Axle/Gears: 10bolt 3.23's I think

Classifieds Rating: (0)
Just to put in my 2cents, it is a 2 piece I'm rebuilding a 95 block and I just removed the rear main 1 piece seal. although I had heard it was 88 and up not 86, good luck with your choice. Oh and by the way, you may need to find a better parts supplier if they can't determine whether or not you have a 1 or 2 piece seal. It's not that hard to figure out.
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Old 08-11-2006, 10:03 PM
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