Notices
C3 General General C3 Corvette Discussion not covered in Tech
Sponsored by:
Sponsored by:

Transmission change from manual to automatic

 
Old 06-12-2019, 07:31 PM
  #1  
Ralphwarner
Junior Member
Thread Starter
 
Member Since: Jun 2019
Location: Charlotte
Posts: 1
Likes: 0
Received 0 Likes on 0 Posts
Default Transmission change from manual to automatic

I have a 74 Corvette convertible. I'm putting a new motor in it and I want to change the trans to an automatic overdrive trans from a manual 4 speed. Which trans should I use? I'm not racing it, just cruising around. Do I have to change the crossmember?
Ralphwarner is offline  
Old 06-12-2019, 07:49 PM
  #2  
gjohnson
CF Senior Member
 
gjohnson's Avatar
 
Member Since: Mar 2008
Location: Denver CO
Posts: 1,132
Received 89 Likes on 71 Posts
Default

The 200-4r is plug and play, the 700r4 is not. It needs a new crossmember and a shortened driveshaft and and diff, yoke.I'm dropping in the 200 in my 76

Last edited by gjohnson; 06-12-2019 at 07:50 PM.
gjohnson is offline  
Old 06-12-2019, 09:19 PM
  #3  
F22
CF Senior Member
 
Member Since: Oct 2006
Location: Palmdale CA
Posts: 6,712
Received 170 Likes on 143 Posts
Default

What rear end gear are you running? With a 3:50 you get the best of both worlds. Tall enough to be on the freeway, but short enough to be spirited when necessary.
F22 is offline  
Old 06-12-2019, 09:50 PM
  #4  
BLUE1972
CF Senior Member
 
BLUE1972's Avatar
 
Member Since: Oct 2008
Location: FARMINGDALE N..Y.
Posts: 4,394
Received 302 Likes on 269 Posts
Default

call Silver Sport, SST , their kits are worth the money, and they install and work perfectly
BLUE1972 is offline  
Old 06-13-2019, 11:36 AM
  #5  
carriljc
CF Senior Member
 
carriljc's Avatar
 
Member Since: Jan 2001
Posts: 2,515
Received 213 Likes on 201 Posts
Default

Interesting. I've been pondering this also since my ROD 6-speed is making a rattling noise at idle in neutral. Thinking about the 200-4r since it would be minimal modification.
carriljc is offline  
Old 06-14-2019, 07:06 AM
  #6  
derekderek
CF Senior Member
 
Member Since: Jul 2015
Location: Westville NJ
Posts: 5,072
Received 662 Likes on 612 Posts
Default

no matter what you put in you have to change the crossmember. you might be able to install the trans with the fixed crossmember while installing the engine, but a removable crossmember will make life way easier.
derekderek is offline  
 


Thread Tools
Search this Thread
Quick Reply: Transmission change from manual to automatic


Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: