Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 04-20-2011, 06:58 AM   #1
olfarmer
Junior Member
 
Join Date: Apr 2011
Location: Davis Oklahoma
Posts: 11
Default open or closed drive line

On making my 40 pickup a better driver it was suggested changing out the four speed for a three speed transmission and changing the rear end gear ratio. In looking the parts I was wondering if it would be better to look for the 42 and up open drive line rear end and a three speed trans that would work. Is there any advantage to the open rear end verses the closed drive line. Any problems making the swap?
Thanks in advance
Mike
olfarmer is offline   Reply With Quote
Old 04-20-2011, 07:34 AM   #2
Charlie ny
Senior Member
 
Join Date: May 2010
Posts: 2,688
Default Re: open or closed drive line

Mike,
With the closed drive comes the torque tube which is THE major
element in keeping the rear axle in place. It's certainly not an over-
whelming job to go to an open drive but either you switch to parallel
rear springs or keep your present rear spring and split the wishbones
then add an additional upper control arm blah blah blah.
In my personal experience I have a '41 pickup with an 8ba
and closed drive and it's golden.
I received your message on the private section of the Barn, I'm
not sure my reply went thru.....call or email when you have chance,
if you wish. 716 662 9159.....cas5845@yahoo.com
Charlie ny
Charlie ny is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 04-20-2011, 09:52 AM   #3
rotorwrench
Senior Member
 
rotorwrench's Avatar
 
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 12,492
Default Re: open or closed drive line

The "78" case three speed center shift transmission can be found in the 39 passenger cars but they were used in pick ups from 1939 to 1950 so are still common. The work it takes to convert to open drive would be excessive in my book. The open drive transmission can be easily converted to the passenger car configuration by changing the rear mount to whatever one will work for you. The guts from any side load remote control car transmission from 1940 to 1948 can be used to fill the case.

Mac VanPelt has an excellent book on identification of gears and overhaul of these venerable old cog boxes. Check his web site for info.

Kerby
rotorwrench is online now   Reply With Quote
Old 04-20-2011, 10:53 AM   #4
Mart
Senior Member
 
Mart's Avatar
 
Join Date: May 2010
Location: Solihull, England.
Posts: 7,174
Default Re: open or closed drive line

Open drive would be a load of work for no real advantage.

Just find a good 3 speed box, bolt it in and run your present axle.

Mart.
Mart is offline   Reply With Quote
Old 04-20-2011, 12:56 PM   #5
41PICUP
Senior Member
 
41PICUP's Avatar
 
Join Date: May 2010
Location: El Cerrito CA
Posts: 338
Default Re: open or closed drive line

Check out the Mitchell Overdrive, either 26 or 36%.
Attached Images
File Type: jpg 100_0692.jpg (83.7 KB, 53 views)
41PICUP is offline   Reply With Quote
Old 04-20-2011, 02:29 PM   #6
kiwitony
Senior Member
 
kiwitony's Avatar
 
Join Date: Aug 2010
Location: Whangaparaoa New Zealand
Posts: 261
Default Re: open or closed drive line

Sponsored Links (Register now to hide all advertisements)
I like those plywood wheels to move it around,very neat.
kiwitony is offline   Reply With Quote
Old 04-20-2011, 05:08 PM   #7
Gumpy
Senior Member
 
Gumpy's Avatar
 
Join Date: May 2010
Location: Sf bay area
Posts: 1,461
Default Re: open or closed drive line

three speed transmission is good,,,open drives advantage is taking out transmission,,,to repair it or resurface flywheel or replace clutch which is a lot easier than enclosed driveline....I have owned both and prefer the original driveline....just looks alot cooler under the pickup!!
Gumpy is offline   Reply With Quote
Old 04-23-2011, 09:26 AM   #8
38 coupe
Senior Member
 
38 coupe's Avatar
 
Join Date: May 2010
Location: South Texas
Posts: 792
Default Re: open or closed drive line

I second the idea of installing a Mitchell overdrive.
38 coupe is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 10:29 AM.