#1  
Old 11-18-2020, 03:29 PM
RicksGTO's Avatar
RicksGTO RicksGTO is offline
Ultimate Warrior
 
Join Date: Jan 2003
Location: Colleyville, Texas
Posts: 3,486
Default '74 Frame Rails

I'm needing to replace a small section of a frame rail on my '74 Trans Am. Does anyone know, are the '74 frame rails similar in some areas to the '70-73 rails or the later 2nd gen. frame rails or possibly a '74 only item? My assumption is that it depends on what part of the rails I'm needing. This is between the front spring mount area and the curve up in the front of the over the axle hump. Probably about 18" long from just behind the front spring mount thru the beginning of the curve upward. Thanks for any help on this question.

__________________
'72 Formula 455HO TH400, Revere Silver, black deluxe
'74 Trans Am SD 4 speed, Admiralty Blue, blue deluxe
  #2  
Old 11-19-2020, 10:00 PM
Aus78Formula Aus78Formula is offline
Suspended
 
Join Date: Aug 2006
Posts: 1,389
Default

70-75 in general, after that they widened slightly for new cat exhaust requirement.

  #3  
Old 11-20-2020, 03:30 PM
RicksGTO's Avatar
RicksGTO RicksGTO is offline
Ultimate Warrior
 
Join Date: Jan 2003
Location: Colleyville, Texas
Posts: 3,486
Default

I didn't think about the catalytic converter altering the underbodies and possibly the frame in that area. If that's the case it would be '75 and up that would be different as the converters began is US cars at the beginning of the '75 model year. Since the trunks pans changed quite a bit in '74 and after, that makes me wonder if that's when they altered this forward portion of the frame. I just found a salvage yard seller that specializes in Camaros/Firebirds that said the forward section of the integrated frame is the same from '74-'81.

__________________
'72 Formula 455HO TH400, Revere Silver, black deluxe
'74 Trans Am SD 4 speed, Admiralty Blue, blue deluxe
  #4  
Old 11-20-2020, 06:54 PM
Aus78Formula Aus78Formula is offline
Suspended
 
Join Date: Aug 2006
Posts: 1,389
Default

Yes, that should possibly be 74/75 chassis change, whenever the cat thing happened. Here's some more details.

http://transamcountry.com/community/...?topic=68213.0

  #5  
Old 11-20-2020, 08:42 PM
RicksGTO's Avatar
RicksGTO RicksGTO is offline
Ultimate Warrior
 
Join Date: Jan 2003
Location: Colleyville, Texas
Posts: 3,486
Default

thanks, good link!

__________________
'72 Formula 455HO TH400, Revere Silver, black deluxe
'74 Trans Am SD 4 speed, Admiralty Blue, blue deluxe
Reply

Thread Tools
Display Modes

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 09:54 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.

 




Copyright © 2017