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

700R4 conversion

Thread Tools
 
Search this Thread
 
Old Feb 22, 2007 | 12:12 AM
  #1  
Bud640's Avatar
Bud640
Thread Starter
Advanced
 
Joined: Apr 2005
Posts: 94
Likes: 0
From: RedOak Texas
Default 700R4 conversion

Hi guys, have a question on the driveshaft? Installing a 700R4 in my 74.
Some one gave me this information and would like to know if it is correct.

As for the driveshaft, just buy an 82 shaft or the alu one from an early C4..it should be a direct fit.

I dont want to cut my shaft as it is OEM but nothing on my car is. I just KEEP all the parts I take off as it was originally.
Reply
Old Feb 22, 2007 | 01:28 AM
  #2  
wombvette's Avatar
wombvette
Le Mans Master
15 Year Member
 
Joined: Jan 2000
Posts: 8,918
Likes: 27
From: New Hill NC
Default

I dont think either are direct fits.
Reply
Old Feb 22, 2007 | 01:55 AM
  #3  
vettedan's Avatar
vettedan
Drifting
25 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Aug 2000
Posts: 1,758
Likes: 4
From: Medford, Or
Default

Originally Posted by Bud640
Hi guys, have a question on the driveshaft? Installing a 700R4 in my 74.
Some one gave me this information and would like to know if it is correct.

As for the driveshaft, just buy an 82 shaft or the alu one from an early C4..it should be a direct fit.

I dont want to cut my shaft as it is OEM but nothing on my car is. I just KEEP all the parts I take off as it was originally.
In order to mount the transmission, buy a '82 vette tail shaft cover, they might still be available from a Chevrolet dealer for around $40.00. You should be able to use the '74 TH350 cross member to mount the tail shaft. You will need to drill 2 new holes behind where the TH400 would mount. I used a '82 vette TH700 rubber mount, it's a bit taller than the TH350 rubber mount . Relocate the E-brake pulley mount since the TH700 is longer than the TH350 and the yoke would have touched the E-brake cable. To cut the driveline to the correct length, measure from the tail shaft rear seal to the center of the u-joint cap and deducted 3/4". This left me adequate room to install the two piece yoke into the transmission and install the drive line. I cut the driveline by around 3 1/2". You will need to removed the old brake light switch from your '74 and installed a ganged brake light switch /TCC- shift interrupt switch. A 4th Gen Camaro Switch should slips right into the '74 brake switch bracket. You can installed a 4 speed automatic shifter conversion kit from Ecklers ( P/N-34800). This kit will adapt the old TH350 cable to 4L60E and change the detents on the shifter and display the overdrive indicator.
Good luck,
Dan
Vetteworks
Reply
Old Feb 22, 2007 | 08:09 AM
  #4  
aussiejohn's Avatar
aussiejohn
Drifting
15 Year Member
 
Joined: Jul 2002
Posts: 1,944
Likes: 20
From: The only Corvettes in Highett Victoria
Default What about a TH200-4R???

Bud,
Your '74 was fitted with a TH400 at the factory and I have read on here that the TH200-4R has the same overall length as the TH400 and therefore you can use your original tailshaft. Also the read trans mount will fit in the same position on the crossmember as the TH400 one.

Unless you have already purchased the TH700-R4, then at least ask some questions about the 200.

Regards from Down Under

aussiejohn
Reply
Old Feb 22, 2007 | 08:54 AM
  #5  
bobs77vet's Avatar
bobs77vet
Race Director
20 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Default

i had mine shortened and it cost $85
Reply
Old Feb 22, 2007 | 12:18 PM
  #6  
markdtn's Avatar
markdtn
Le Mans Master
10 Year Member
 
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Default

You cannot use an 82 driveshaft in an iron diff car (68-79). You could use it with an aluminum diff car 700R4 conversion, 80-81 and of course 82.

I am pretty sure GM is long sold out of 82 tailhousings. Somebody like Phoenix? was selling 1 that will work. If you get a tubular crossmember from BowTie you don't need that mount anyway, it uses the holes in the case just behind the pan. C4 700R4s are not drilled and tapped there.
Reply
Old Feb 22, 2007 | 02:42 PM
  #7  
mrvette's Avatar
mrvette
Team Owner
Active Streak: 120 Days
Liked
Loved
Community Favorite
 
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
Default

Originally Posted by bobs77vet
i had mine shortened and it cost $85

Ain't NO ONE shortening MY driveshaft....


oh, you mean the one on the CAR???




but for a 200 4r install the shaft is stock length with a THM350 yoke...same splines as a 200/700 tranny....the 400/muncie took the larger output shaft....

IMO, and I switched form an olde tyme early on 10 years old 700 swap and put in a 200 4r, and am much happier for the switch....much better suited to the car.....I have a warmed up SBC....
Reply

Get notified of new replies

To 700R4 conversion





All times are GMT -4. The time now is 04:35 AM.

story-0
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-1
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-2
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-3
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-4
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

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


VIEW MORE
story-5
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-6
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-7
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
story-8
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-9
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE