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  #1  
Old 02-17-2026, 11:42 AM
1968firebird455 1968firebird455 is offline
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Default WANTED: Oldsmobile 403 crank for 1979 Trans Am
WANTED: Oldsmobile 403 crank for 1979 Trans Am. Part number: 556607

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Old 02-17-2026, 02:07 PM
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I believe the 350 and 403 share the same casting number crankshaft. However, they are balanced differently. From what I remember there is a visual identifier on the 403 crankshaft.

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Old 02-17-2026, 04:29 PM
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Default Oldsmobile 403 crank for 1979 Trans Am
I have a couple of 403 specific crankshafts. I can ship via Fastenal, unless you know someone coming down to our Winter racing paradise. I'm near Bradenton Motorsports Park, Orlando Speed World and can hear the cars at Sebring Raceway from my back yard. Please let me know if you're interested. Thanks, Bob.
PS: The casting # that you referenced is actually a late model, lightweight crankshaft. I do have those also, if interested. Please let me know. Thanks, Bob.

Last edited by ROCKETMAN269V; 02-17-2026 at 04:55 PM.
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Old 02-17-2026, 04:53 PM
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Originally Posted by 1968firebird455 View Post
WANTED: Oldsmobile 403 crank for 1979 Trans Am. Part number: 556607
The casting # that you referenced is actually a late model, lightweight crankshaft. I do have those also, if interested. Please let me know. Thanks, Bob.

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Old 02-19-2026, 09:39 AM
1968firebird455 1968firebird455 is offline
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I am interested! Please PM me a price and shipping to North Royalton, OH

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Old 02-19-2026, 12:57 PM
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I am interested! Please PM me a price and shipping to North Royalton, OH
Are you interested in the casting # that you posted or a true 403 crank?

390275 403 '77 - '79 Balance hole in the 1st throw, nice 1/8" or so
groove cut into the circumference groove on the #1
counterweight. Most drilled for manual trans use.
556607 350 '77 Plain iron. No 'N' on front weight. No balance hole.
"C" notch 5/8" deep, 1" wide.
556607 307 '85 This might be wrong. '77 350 is positive.

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Old 02-19-2026, 03:03 PM
1968firebird455 1968firebird455 is offline
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The correct 403 crank.

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Old 02-19-2026, 03:10 PM
1968firebird455 1968firebird455 is offline
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I'm also interested in connecting rods if you have any.

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Old 02-20-2026, 12:46 PM
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I'm also interested in connecting rods if you have any.
I should have both; have to check over the weekend. Thanks, Bob.

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Old 02-21-2026, 12:12 PM
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Received your PM; however, your inbox is full. I'll call you when I verify all parts. Thanks, Bob.

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Old 02-24-2026, 10:17 AM
1968firebird455 1968firebird455 is offline
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I cleared out some messages so there is room in my inbox. Feel free to call or text me.

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