TH400 to 200R4 conversion Question - Page 2 - Pontiac GTO Forum
User Tag List

Reply
 
LinkBack Thread Tools Display Modes
post #11 of 22 (permalink) Old 03-09-2010, 12:16 PM
Super Moderator
 
Rukee's Avatar
 
Join Date: Feb 2007
Location: South Central Wisconsin
Posts: 9,889
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
Quote:
Originally Posted by Thumpin455 View Post
But hey, what would I know?
Being a shop owner for more then 19 years, I'm in the same boat.
Rukee is offline  
Sponsored Links
Advertisement
 
post #12 of 22 (permalink) Old 03-09-2010, 01:21 PM
 
ppurfield001's Avatar
 
Join Date: Jan 2008
Location: Fort Mill, SC
Posts: 779
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Rukee View Post
Even if he's not running WOT down the track every weekend, you don't want the tranny to fry the first time you do go WOT and let it rip through the gears.
They used the 200r4 behind the 231 buick engines and they would take them out.


I'm going to hijack this thread, so I apologize in advance. I want to be able to cruise in the teens on the highway and I'm looking to swap out my 4-speed manual Muncie for a new transmission with overdrive (Richmond five-speed has been suggested). Currently running with a ten-bolt rear with 3:55:1 gears and a pretty stock 400 CID with 335 horse. Any other suggestions to achieve my goal? Thanks.

ppurfield001 is offline  
post #13 of 22 (permalink) Old 03-09-2010, 02:30 PM
64-67 Expert
 
geeteeohguy's Avatar
 
Join Date: Feb 2008
Location: Fresno, California
Posts: 7,878
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Gear Vendors makes a bolt-on overdrive for the Munice. Also, ther's a company that makes gearsets for muncie trannies that gives them an overdrive. The shift pattern gets changed, and you still have only 4 gears, but one of them is OD. Both of these would require no floorpan butchering. I've had great results in 4 speed GTO's with a 3.23 gear. With the amount of torque a Pontiac makes, you won't notice the difference off the line from the 3:55's, but the freeway cruise is much better..about 3k at 73-74 mph. Doug Nash also had a 5 speed, but I think mods are needed to the pan, as well.
geeteeohguy is offline  
post #14 of 22 (permalink) Old 03-10-2010, 07:10 AM
 
Join Date: Oct 2007
Location: Long Island NY
Posts: 4,714
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Quote:
Originally Posted by ppurfield001 View Post
I'm going to hijack this thread, so I apologize in advance. I want to be able to cruise in the teens on the highway and I'm looking to swap out my 4-speed manual Muncie for a new transmission with overdrive (Richmond five-speed has been suggested). Currently running with a ten-bolt rear with 3:55:1 gears and a pretty stock 400 CID with 335 horse. Any other suggestions to achieve my goal? Thanks.
Paul, go toMedatronics Corporation's 5 Speed Home page!speak to Paul he has been building standard transmissions since we were kids. Yes over 30 years. tell him you are a friend of mine and you need a solid 5 speed for a GTO. He will steer you in the exact right direction and or supply what you need. He has also written and published a book. Tell him Eric Aull sent you....this goes for everyone else also...GOOD STUFF!!!
Eric Animal is offline  
post #15 of 22 (permalink) Old 03-10-2010, 07:59 AM
 
ppurfield001's Avatar
 
Join Date: Jan 2008
Location: Fort Mill, SC
Posts: 779
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Eric Animal View Post
Paul, go toMedatronics Corporation's 5 Speed Home page!speak to Paul he has been building standard transmissions since we were kids. Yes over 30 years. tell him you are a friend of mine and you need a solid 5 speed for a GTO. He will steer you in the exact right direction and or supply what you need. He has also written and published a book. Tell him Eric Aull sent you....this goes for everyone else also...GOOD STUFF!!!

I will try calling him today. Thanks for the lead. What type of transmission are you installing in your new goat, which sounds unbelievable, by the way? Regards.

ppurfield001 is offline  
post #16 of 22 (permalink) Old 03-10-2010, 09:43 AM
67 Basket Case Restorer
 
Too Many Projects's Avatar
 
Join Date: Nov 2008
Location: Stillwater, MN
Posts: 2,717
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Quote:
Originally Posted by CTCarGuy View Post
I am changing out my th400 in a 71 GTo for a built-up 200R4 so I have an overdrive for the Hot Rod Power Tour in June. I already have the transmission but there is a question on transmission yoke and drive shaft. The TH400 is 1" longer than the 200R4 and uses a 31 spline. I want to retain the original drive shaft and just replace the yoke (and u joints if needed)with a 27 spline yoke. The question is how long the shaft on the new yoke should be. I have not removed the original yoke to measure it yet. New yokes have a 3" or 6" shaft. I don't want to put in a too long or too short shaft! Can the shaft be cut and if so, what is the best method? Thanks.
If you are getting the trans from a reputable builder, don't they have a yoke to purchase with it for the conversion ? Maybe Thumpin' 455 can come up with a GM part number or specific application yoke that he has used in the past for you to get. If not, I would bolt the trans in place and measure from the center of the u-joint to center of the yoke travel in the trans. If you can't get the original driveshaft to work with those dim's, I would consider a new shaft and leave the original in the corner. The original shaft can be cut, shortened and rebalanced by a reputable shop with the proper equipment to do that, but it's never going back behind a TH 400 then....

I seriously considered a 200 for my 67 Camaro and wouldn't hesitate to use one that is built by a reputable aftermarket builder to handle 400 lbs. ft. of torque, but again, it HAS to be a high quality build to last. I'm a clutch in a muscle car guy and will, instead, convert my PG to a manual in time. For you, the overdrive will be sweet in a street cruiser on the highway...


Uh, Eric.......what happened to the manual trans idea ??? If you put a slushbox in that car, I'm gonna sneak up there and swap in a 6 speed myself. That combination just SCREAMS for a 6 speed and 3.90's......

Mitch
1967 GTO; Gulf Turquoise on Black, 4 speed, buckets SOLD
1967 Camaro ss/rs 350
1966 Chevelle SS 396
1966 Chevelle Malibu
1970 Chevelle SS 396
1962 Impala SS
1952 Chev 2 ton flat bed
1938 Chev coupe
Too Many Projects is offline  
post #17 of 22 (permalink) Old 03-10-2010, 07:19 PM
 
Join Date: Oct 2007
Location: Long Island NY
Posts: 4,714
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Quote:
Originally Posted by ppurfield001 View Post
I will try calling him today. Thanks for the lead. What type of transmission are you installing in your new goat, which sounds unbelievable, by the way? Regards.
I am going to use a 4 speed automatic....probably a L480e the electronic stuff scares me. I've been told that you can really tune the shift points, and firmness of shifts very easily. I think it is basically the same tranny that is in a Chevy Tahoe or Silverado 1500. Gotta look into it further. "All those little chunks of aluminum and pretty gears, springs,balls and servos sprayed on the pavement" sounds like an expensive improper choice to me....gotta get it right. Eric
Eric Animal is offline  
post #18 of 22 (permalink) Old 03-10-2010, 08:06 PM
 
injn37's Avatar
 
Join Date: Nov 2008
Location: Southern New Hampshire
Posts: 275
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I put a Tremac TKO 5 behind my 455 in the 65. Got it from Keisler Engineering. Fit pretty good with the stock floor. Just had to open up the floor a little in the front ( a 1" x 4" strip) and a 2" x 2" area on the pass side back. I just modified the porch for a slick fit. Cross member moved back to where the front holes in the bracket located into the back holes in the frame and drilled new back holes. Shifter locates correctly into the console. Done.
Haven't driven it yet as not done, but a friend has one in his 67 Chevelle, and and he swears by it, that it has changed his ride for the better by leaps and bounds, what ever a leap or a bound is!

If you need, I can try and take some pictures if you want

rich
injn37 is offline  
post #19 of 22 (permalink) Old 03-11-2010, 08:20 AM
Super Moderator
 
Rukee's Avatar
 
Join Date: Feb 2007
Location: South Central Wisconsin
Posts: 9,889
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
Quote:
Originally Posted by injn37 View Post
I put a Tremac TKO 5 behind my 455 in the 65. Got it from Keisler Engineering. Fit pretty good with the stock floor. Just had to open up the floor a little in the front ( a 1" x 4" strip) and a 2" x 2" area on the pass side back. I just modified the porch for a slick fit. Cross member moved back to where the front holes in the bracket located into the back holes in the frame and drilled new back holes. Shifter locates correctly into the console. Done.
Haven't driven it yet as not done, but a friend has one in his 67 Chevelle, and and he swears by it, that it has changed his ride for the better by leaps and bounds, what ever a leap or a bound is!

If you need, I can try and take some pictures if you want

rich
I'd love to see some pictures, and to have a 5 speed in mine!


Were you able to keep the HURST shifter?
Rukee is offline  
post #20 of 22 (permalink) Old 03-11-2010, 09:08 AM
67 Basket Case Restorer
 
Too Many Projects's Avatar
 
Join Date: Nov 2008
Location: Stillwater, MN
Posts: 2,717
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Quote:
Originally Posted by Rukee View Post
Were you able to keep the HURST shifter?
Hurst makes shifters for them but, obviously, the 4 speed shifter won't convert to a 5 speed...
RICHMOND 5-SPEED SHIFTER

Mitch
1967 GTO; Gulf Turquoise on Black, 4 speed, buckets SOLD
1967 Camaro ss/rs 350
1966 Chevelle SS 396
1966 Chevelle Malibu
1970 Chevelle SS 396
1962 Impala SS
1952 Chev 2 ton flat bed
1938 Chev coupe
Too Many Projects is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring
Gear in this thread - Powered by O'Reilly Auto Parts

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
What to ask for my 455 and th400? 67goatman455 1964-1974 Tempest, Lemans & GTO General Discussion 8 08-09-2009 05:51 PM
TH400 question teamwoody72 1964-1974 Tempest, Lemans & GTO General Discussion 3 05-25-2009 10:21 AM
TH400 rebuild Face 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions. 0 02-08-2009 07:36 PM
2spd. powerglide to th400 dtroit 1964-1974 Tempest, Lemans & GTO General Discussion 4 11-03-2008 07:41 AM
TH400 Turbo Hydromatic from '68 Dr. Wicked 1964-1974 GTO parts for sale (Price & Pictures Required) 0 03-04-2008 07:28 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome