C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

700R4 Question

Thread Tools
 
Search this Thread
 
Old Jun 29, 2006 | 03:39 PM
  #1  
JasenZ51's Avatar
JasenZ51
Thread Starter
Intermediate
 
Joined: Apr 2006
Posts: 36
Likes: 0
From: Calgary AB
Default 700R4 Question

Will a 700 R4 out of a Third Gen Firebird fit into my C4?

I have heard tail housings may be different, but thats an easy fix???
Reply
Old Jun 29, 2006 | 04:07 PM
  #2  
Fubar569's Avatar
Fubar569
Burning Brakes
15 Year Member
 
Joined: Sep 2004
Posts: 869
Likes: 1
From: Bradford Pa
Default

physically? yes

tailshafts are vastly different. you must use your old one

governors are different

servo is different

only the vette 700R will allow WOT in 4th gear. this is again an easy fix to swap in the vette parts

so to answer your question now in a short version...

yes it will fit, but they are still vastly different
Reply
Old Jun 29, 2006 | 06:09 PM
  #3  
JasenZ51's Avatar
JasenZ51
Thread Starter
Intermediate
 
Joined: Apr 2006
Posts: 36
Likes: 0
From: Calgary AB
Default

Originally Posted by Fubar569
physically? yes

tailshafts are vastly different. you must use your old one

governors are different

servo is different

only the vette 700R will allow WOT in 4th gear. this is again an easy fix to swap in the vette parts

so to answer your question now in a short version...

yes it will fit, but they are still vastly different
Thanks for the reply. This is a rebuilt tranny that has all the Vette parts inside it. So basically all i need to do is swap tail shafts? Are all the electronics the same??

Thanks
Reply
Old Jun 29, 2006 | 06:14 PM
  #4  
Pete K's Avatar
Pete K
Race Director
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Feb 2004
Posts: 12,517
Likes: 19
Default

Originally Posted by JasenZ51
Thanks for the reply. This is a rebuilt tranny that has all the Vette parts inside it. So basically all i need to do is swap tail shafts? Are all the electronics the same??

Thanks
The tail shaft is 3/4 inch longer in a non vette trans. The tail housing is simple to swap. The tail shaft is not. The electronics are not the same. GM used approx 15 different wiring arrangements regarding the lock up.
Reply
Old Jun 29, 2006 | 07:17 PM
  #5  
jeffyc's Avatar
jeffyc
Racer
15 Year Member
 
Joined: Dec 2004
Posts: 306
Likes: 0
Default

good post pete
i was just about to say the same
Reply
Old Jun 30, 2006 | 03:47 PM
  #6  
JasenZ51's Avatar
JasenZ51
Thread Starter
Intermediate
 
Joined: Apr 2006
Posts: 36
Likes: 0
From: Calgary AB
Default

Originally Posted by Pete K
The tail shaft is 3/4 inch longer in a non vette trans. The tail housing is simple to swap. The tail shaft is not. The electronics are not the same. GM used approx 15 different wiring arrangements regarding the lock up.

If I have both trannys can i swap over the parts? Or is this going to be a nightmare to do? Has anyone on this board done this before?
Reply
Old Jun 30, 2006 | 04:13 PM
  #7  
circlegroup's Avatar
circlegroup
Advanced
 
Joined: Mar 2005
Posts: 68
Likes: 0
From: Plantation 1990 L98 383 Stroker Florida
Default

I have just finished putting a 90 comaro 700R4 into my 90 corvette with no issues. Swapped the tail housings and the speedo gear. Peice of cake. Just check your yoke in the rear tail housing to see if it fits up tight and you will be good to go. Don't know much about firebirds.
Reply
Old Jun 30, 2006 | 04:18 PM
  #8  
Pete K's Avatar
Pete K
Race Director
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Feb 2004
Posts: 12,517
Likes: 19
Default

The entire transmission must be disassembled to reach the c clip that holds the output shaft in. If you are comfortable tearing down the unit, no big deal. If you have never been in an auto trans, you don't want to tear into a 700r4 for your 1st time. Depending on the year of the trans, lock up normally switches right over.
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 Jul 3, 2006 | 03:38 PM
  #9  
JasenZ51's Avatar
JasenZ51
Thread Starter
Intermediate
 
Joined: Apr 2006
Posts: 36
Likes: 0
From: Calgary AB
Default

Originally Posted by Pete K
The entire transmission must be disassembled to reach the c clip that holds the output shaft in. If you are comfortable tearing down the unit, no big deal. If you have never been in an auto trans, you don't want to tear into a 700r4 for your 1st time. Depending on the year of the trans, lock up normally switches right over.

Why does the Tail Shaft need to be swapped?
Reply
Old Jul 3, 2006 | 03:43 PM
  #10  
GeosFun's Avatar
GeosFun
Burning Brakes
 
Joined: Nov 2003
Posts: 914
Likes: 1
From: Redding Ca
Default

I do not know what years you are talking about. I had an '87 GTA and had the 700R rebult. The tranny guy said the pre-1988 700's cannot be built as strongly as later years.:o
Reply
Old Jul 3, 2006 | 04:09 PM
  #11  
Pete K's Avatar
Pete K
Race Director
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Feb 2004
Posts: 12,517
Likes: 19
Default

Originally Posted by JasenZ51
Why does the Tail Shaft need to be swapped?
The vette tailshaft is 3/4 of an inch shorter than the f-body. Some guys claim that it will work and not bottom out in the vette yoke. On the 3 that I have attempted, it has always NOT worked. Also vette uses a different hole for the drive (speedo) gear in the tailshaft. Remember to move it or it will chew up in the first couple of miles.
Reply
Old Jul 3, 2006 | 04:10 PM
  #12  
Pete K's Avatar
Pete K
Race Director
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Feb 2004
Posts: 12,517
Likes: 19
Default

Originally Posted by GeosFun
I do not know what years you are talking about. I had an '87 GTA and had the 700R rebult. The tranny guy said the pre-1988 700's cannot be built as strongly as later years.:o
He is mistaken. It sometimes is not cost effective to do it, but can be done.
Reply

Get notified of new replies

To 700R4 Question





All times are GMT -4. The time now is 10:28 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