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

Firewall 4-Speed Conversion Question.

Thread Tools
 
Search this Thread
 
Old Sep 15, 2021 | 09:17 AM
  #1  
Cavu2u's Avatar
Cavu2u
Thread Starter
Melting Slicks
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2013
Posts: 2,569
Likes: 126
From: San Diego California
Default Firewall 4-Speed Conversion Question.

It appears the Firewall in the Pedal Area of Automatic Transmission cars is much different from Manual Transmission cars.



There are no holes cut for the Clutch Pedal Push Rod.


I take it that the Pedal Bracket is universal; the same for both auto and manual trannys.

If so, I'm expecting the Boot screw holes are pre-drilled in the Pedal Bracket (boxed Diagram C). Can you confirm?
And a question about the arrowed assembly: What is it? Do we need it? Obviously the Push Rod Return Spring must anchor to something on the Firewall.

Just hoping someone who has done this on theirs can enlighten me.
Thanks very much.

Steve
Reply
Old Sep 15, 2021 | 10:12 AM
  #2  
johns73's Avatar
johns73
Racer
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Jul 2001
Posts: 361
Likes: 9
From: Dresser WI
Default

The hole for the rod was higher than i thought on mine. There was a plug with three small screws that held a plug in place. Once i found the plug and removed it the rod went thru the fire wall and lined up perfectly with the z bar. The three screws were used to hold the new boot on. I had to drill a small where the interlock cable goes thru on the column bracket for the return spring. My 73 is an early one, but should be the same as yours.
Reply
Old Sep 15, 2021 | 11:21 AM
  #3  
nyciti's Avatar
nyciti
Burning Brakes
Photogenic
Photoriffic
Liked
Top Answer: 1
 
Joined: Aug 2016
Posts: 1,001
Likes: 283
From: New York
Default

Your photo is wrong, the pedal hole is towards the fender. As noted it's a hole with 3 screws should be right above / around the fuse box.
Reply
Old Sep 15, 2021 | 01:01 PM
  #4  
Cavu2u's Avatar
Cavu2u
Thread Starter
Melting Slicks
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2013
Posts: 2,569
Likes: 126
From: San Diego California
Default

OOOOOOHH! I GOT IT!
The arrowed box in the diagram is the Fuse Box Plug. Now I know exactly where to look.
THANKS GUYS!


Steve

Found it.
Hid well by the Power Brake Booster.


Steve

Last edited by Cavu2u; Sep 15, 2021 at 01:52 PM. Reason: Add picture.
Reply
Old Sep 15, 2021 | 01:55 PM
  #5  
johns73's Avatar
johns73
Racer
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Jul 2001
Posts: 361
Likes: 9
From: Dresser WI
Default

That's it. Its difficult getting the screws out and replacing them, but defiantly doable.
Reply

Get notified of new replies

To Firewall 4-Speed Conversion Question.





All times are GMT -4. The time now is 01:15 PM.

story-0
10 Corvettes to Drive Before You Die!

Slideshow: 10 Corvettes to drive before you die.

By Joe Kucinski | 2026-06-23 08:31:12


VIEW MORE
story-1
Corvette & Porsche 911: How Two Icons Conquered the Last 25 Years

Slideshow: Corvette and Porsche 911, how two icons conquered the last 25 years.

By Joe Kucinski | 2026-06-23 08:18:33


VIEW MORE
story-2
2027 Chevrolet Silverado 1500 First Look: Everything You NEED to Know!

Slideshow: Is the 2027 Chevrolet Silverado 1500 the best Silverado yet?

By Michael S. Palmer | 2026-06-16 08:01:12


VIEW MORE
story-3
5 Best & 5 Worst Corvette Daily Drivers

Slideshow: 5 best and 5 worst Corvette daily drivers

By Joe Kucinski | 2026-06-15 10:32:13


VIEW MORE
story-4
The Headlights of Every Corvette Generation Explained

Slideshow: The headlights of every Corvette generation explained

By Joe Kucinski | 2026-06-15 10:17:14


VIEW MORE
story-5
5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Slideshow: The 5 best and 5 most overrated Corvette track packages ever.

By Joe Kucinski | 2026-06-09 12:46:45


VIEW MORE
story-6
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

By Joe Kucinski | 2026-06-09 12:16:31


VIEW MORE
story-7
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.

By Verdad Gallardo | 2026-06-08 19:53:43


VIEW MORE
story-8
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-9
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE