Home Menu

Menu


          
PY Online Forums - Bringing the Pontiac Hobby Together > BUY, SELL, TRADE Classic PONTIAC "PARTS" > 67-81 Firebird & TA Parts WANTED > WANTED: Oldsmobile 403 crank for 1979 Trans Am
Reply
 
Thread Tools Display Modes
  #1  
Old 02-17-2026, 11:42 AM
1968firebird455 1968firebird455 is offline
Senior Chief
  
Join Date: Mar 2008
Location: Cleveland, Ohio
Posts: 467
Send a message via AIM to 1968firebird455
Default WANTED: Oldsmobile 403 crank for 1979 Trans Am
WANTED: Oldsmobile 403 crank for 1979 Trans Am. Part number: 556607

__________________
Redline Design
Reply With QuoteReply With Quote
  #2  
Old 02-17-2026, 02:07 PM
74SDformula's Avatar
74SDformula 74SDformula is offline
Chief Ponti-yacker
  
Join Date: Dec 2003
Location: McDonough, GA.
Posts: 762
Default
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.

Reply With QuoteReply With Quote
  #3  
Old 02-17-2026, 04:29 PM
ROCKETMAN269V's Avatar
ROCKETMAN269V ROCKETMAN269V is offline
Member
  
Join Date: Jan 2008
Location: South Central Florida
Posts: 31
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.
Reply With QuoteReply With Quote
  #4  
Old 02-17-2026, 04:53 PM
ROCKETMAN269V's Avatar
ROCKETMAN269V ROCKETMAN269V is offline
Member
  
Join Date: Jan 2008
Location: South Central Florida
Posts: 31
Default
Quote:
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.

Reply With QuoteReply With Quote
  #5  
Old 02-19-2026, 09:39 AM
1968firebird455 1968firebird455 is offline
Senior Chief
  
Join Date: Mar 2008
Location: Cleveland, Ohio
Posts: 467
Send a message via AIM to 1968firebird455
Default
I am interested! Please PM me a price and shipping to North Royalton, OH

__________________
Redline Design
Reply With QuoteReply With Quote
  #6  
Old 02-19-2026, 12:57 PM
ROCKETMAN269V's Avatar
ROCKETMAN269V ROCKETMAN269V is offline
Member
  
Join Date: Jan 2008
Location: South Central Florida
Posts: 31
Default
Quote:
Originally Posted by 1968firebird455 View Post
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.

Reply With QuoteReply With Quote
  #7  
Old 02-19-2026, 03:03 PM
1968firebird455 1968firebird455 is offline
Senior Chief
  
Join Date: Mar 2008
Location: Cleveland, Ohio
Posts: 467
Send a message via AIM to 1968firebird455
Default
The correct 403 crank.

__________________
Redline Design
Reply With QuoteReply With Quote
  #8  
Old 02-19-2026, 03:10 PM
1968firebird455 1968firebird455 is offline
Senior Chief
  
Join Date: Mar 2008
Location: Cleveland, Ohio
Posts: 467
Send a message via AIM to 1968firebird455
Default
I'm also interested in connecting rods if you have any.

__________________
Redline Design
Reply With QuoteReply With Quote
  #9  
Old 02-20-2026, 12:46 PM
ROCKETMAN269V's Avatar
ROCKETMAN269V ROCKETMAN269V is offline
Member
  
Join Date: Jan 2008
Location: South Central Florida
Posts: 31
Default
Quote:
Originally Posted by 1968firebird455 View Post
I'm also interested in connecting rods if you have any.
I should have both; have to check over the weekend. Thanks, Bob.

Reply With QuoteReply With Quote
The Following User Says Thank You to ROCKETMAN269V For This Useful Post:
  #10  
Old 02-21-2026, 12:12 PM
ROCKETMAN269V's Avatar
ROCKETMAN269V ROCKETMAN269V is offline
Member
  
Join Date: Jan 2008
Location: South Central Florida
Posts: 31
Default
Received your PM; however, your inbox is full. I'll call you when I verify all parts. Thanks, Bob.

Reply With QuoteReply With Quote
The Following User Says Thank You to ROCKETMAN269V For This Useful Post:
  #11  
Old 02-24-2026, 10:17 AM
1968firebird455 1968firebird455 is offline
Senior Chief
  
Join Date: Mar 2008
Location: Cleveland, Ohio
Posts: 467
Send a message via AIM to 1968firebird455
Default
I cleared out some messages so there is room in my inbox. Feel free to call or text me.

__________________
Redline Design
Reply With QuoteReply With Quote
Reply

« Previous Thread | Next Thread »

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 09:03 AM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 




Contact Us Home
Copyright © 2017