C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

Frame interchangablity??

Thread Tools
 
Search this Thread
 
Old May 14, 2003 | 04:16 PM
  #1  
Detroit Vette's Avatar
Detroit Vette
Thread Starter
Melting Slicks
 
Joined: Jul 2001
Posts: 3,335
Likes: 1
Default Frame interchangablity??

I want to to confirm that that 79 frame is the same as a 1975. These urethane bumper cars are new to me. I am used to dealing in the chrome bumper stuff. Anyway i am about o buy a 79 frame but i want to make sure it will work without mods
Reply
Old May 14, 2003 | 06:47 PM
  #2  
spikezz4's Avatar
spikezz4
Pro
10 Year Member
 
Joined: Apr 2000
Posts: 625
Likes: 0
From: The Villages FL
Default Re: Frame interchangablity?? (sdixon)

When I replaced mine in the spring of 1998, no one made a new 73-77 frame. I think there is one now, but I forget who makes it. We bought a 78-82 frame and used the old 77 rear-most cross-member in the new frame to make it right for the 77 body. Worked, but required fabrication & welding skills.
Spike
Reply
Old May 14, 2003 | 08:48 PM
  #3  
Dalannex's Avatar
Dalannex
Safety Car
25 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Mar 2000
Posts: 4,077
Likes: 27
From: Northeast South Dakota
Default Re: Frame interchangablity?? (sdixon)

The rear crossmember where the differential mounts is different. you would need to cut the crossmember off of both frames and switch them around, or use the later aluminum differential mount with the newer frame and throw the body on it that way.

-Justin
Reply
Old May 14, 2003 | 09:08 PM
  #4  
Twin_Turbo's Avatar
Twin_Turbo
Race Director
25 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Dec 1999
Posts: 16,945
Likes: 9
Default Re: Frame interchangablity?? (Dalannex)

?? the aluminium diff w/ carrier came in 80, not in 79. 79 still uses the iron Dana 44 w/ the separate cross bar in the rear.

If you use the later model frame, the transmission crossmember w/ 2 holes for exhaust is NOT bolt in. The bolts on the underside of the frame rails meet up, the ears on the sides however need to be extended by 1/2 inch or so and redrilled.





[Modified by Twin_Turbo, 4:22 AM 5/15/2003]
Reply
Old May 14, 2003 | 09:55 PM
  #5  
Detroit Vette's Avatar
Detroit Vette
Thread Starter
Melting Slicks
 
Joined: Jul 2001
Posts: 3,335
Likes: 1
Default Re: Frame interchangablity?? (Twin_Turbo)

Actually i made a typing boobo. It is a 1978 frame. Hey Marck, i am going to send you the pictures of this car for the website project area. I just got it up on the body dolly at the shop yesterday. I am going to start snapping pictures of the progress.
Reply
Old May 15, 2003 | 08:11 AM
  #6  
gdh's Avatar
gdh
Le Mans Master
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2000
Posts: 8,721
Likes: 108
From: Canada
Default Re: Frame interchangablity?? (sdixon)

The only real difference I saw was on the rear upper part of the frame, how they welded an angled support member to keep the frame more rigid.
Reply
Old May 15, 2003 | 09:54 AM
  #7  
Dalannex's Avatar
Dalannex
Safety Car
25 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Mar 2000
Posts: 4,077
Likes: 27
From: Northeast South Dakota
Default Re: Frame interchangablity?? (Twin_Turbo)

?? the aluminium diff w/ carrier came in 80, not in 79. 79 still uses the iron Dana 44 w/ the separate cross bar in the rear.

If you use the later model frame, the transmission crossmember w/ 2 holes for exhaust is NOT bolt in. The bolts on the underside of the frame rails meet up, the ears on the sides however need to be extended by 1/2 inch or so and redrilled.

[Modified by Twin_Turbo, 4:22 AM 5/15/2003]
You know, that could be right. I guess I always thought that the 78-82 frames were all the same, but I don't know that for a fact. Now that you bring it up it does seem that I remember reading somewhere that the diff was changed in 80'.
Reply
Old May 15, 2003 | 10:43 AM
  #8  
Tom73's Avatar
Tom73
Race Director
25 Year Member
Active Streak: 120 Days
All Eyes On Me
Liked
 
Joined: Apr 1999
Posts: 15,133
Likes: 477
From: NM
Default Re: Frame interchangablity?? (sdixon)

The gas tanks were different so there could be some tank mounting differences but don't think that would cause any real problems.

tom...
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-1

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-2

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-3

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-4

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-5

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-6

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-7

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
story-8

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

 Joe Kucinski
story-9

10 Most Common Corvette Problems of the Last 20 Years!

 Joe Kucinski
Old May 15, 2003 | 02:36 PM
  #9  
Twin_Turbo's Avatar
Twin_Turbo
Race Director
25 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Dec 1999
Posts: 16,945
Likes: 9
Default Re: Frame interchangablity?? (Dalannex)

?? the aluminium diff w/ carrier came in 80, not in 79. 79 still uses the iron Dana 44 w/ the separate cross bar in the rear.

If you use the later model frame, the transmission crossmember w/ 2 holes for exhaust is NOT bolt in. The bolts on the underside of the frame rails meet up, the ears on the sides however need to be extended by 1/2 inch or so and redrilled.

[Modified by Twin_Turbo, 4:22 AM 5/15/2003]

You know, that could be right. I guess I always thought that the 78-82 frames were all the same, but I don't know that for a fact. Now that you bring it up it does seem that I remember reading somewhere that the diff was changed in 80'.
Yes, the aluminium differential was first featured in 1980 so 80-82 frames are different from the others in that area too. Also, the tranny crossmember was changed to a dimpled one instead of the one w/ 2 holes.
Reply

Get notified of new replies

To Frame interchangablity??





All times are GMT -4. The time now is 11:41 PM.

story-0
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-1
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-2
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-3
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-4
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-5
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-6
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-7
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-8
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-9
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE