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1979 Trans Am

 
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ponchomaniac



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PostPosted: Thu Feb 14, 2013 1:40 pm    Post subject: 1979 Trans Am Reply with quote

I am taking a 403 motor out of my 1979 T/A and putting in a 400 Pontiac motor. What am I going to run into doing this swap? What parts are different between the two motors that I,m going to need? The car is an automatic.
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Larry
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Joined: 01 Jun 2006
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PostPosted: Thu Feb 14, 2013 2:20 pm    Post subject: Engine Swap Reply with quote

A little looking around shows that the frame mounts are OK, but the engine brackets are different. You need to use the Pontiac ones. Also the Olds engine "shaker" assy. is different than the 400 one; won't center correctly in your hood if put on a 400. Ditto on the bracketing and such for the accessories. Will need Pontiac stuff for your new Pontiac engine.

It appears that the engine brackets for 1975-'81 are the same, even those from the 301 will work on the 400 and 455.

Let us know how it goes for you.

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stanpaula30



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PostPosted: Fri Jan 13, 2017 11:08 pm    Post subject: Reply with quote

hello every one my name is stan can anyone tell me how i can get a build sheet for my 1979 pont trans am iam told its a se y84 car but i would like to prove it and also see if it may be a ws6 car as well my email is stanpaula30@yahoo.com thank you all.
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Larry
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PostPosted: Sun Jan 15, 2017 12:53 pm    Post subject: Build Sheet Reply with quote

Other than getting lucky and finding the original build sheet stuck in the rear seat cushion or nearby, the only chance is by contacting Pontiac Historical Services. Google to find their web site. There is a charge involved, but probably well worth the cost to prove what you wish.
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