Go Back   The Ford Barn > General Discussion > Late V8 (1954+)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 01-22-2021, 09:12 AM   #1
zuburg
Senior Member
 
zuburg's Avatar
 
Join Date: Jun 2015
Location: Raleigh, NC
Posts: 332
Default Fordomatic: Are there different output shafts for different Fordomatics?

Do different Fordomatics have different output shafts with a different number of teeth or size? For example, would the output shaft from a truck have a different number of teeth than a Thunderbird?

I have been working on repairing (not restoring) a 1956 T-bird for nearly 5 years and have run into many problems caused by previous owners installing non-T-bird parts such as a 239 engine and a Fordomatic from either a passenger car or truck (or possibly some combination of both). I replaced the transmission with a T-bird tranny only to find the torque converter did not match (wrong number of teeth) and had to replace the turbine in the converter. Now I’m ready to install the drive shaft and the yoke is not easily sliding over the output shaft and I’m wondering if I have another problem with a mismatch of teeth.
zuburg is offline   Reply With Quote
Old 01-22-2021, 04:05 PM   #2
zuburg
Senior Member
 
zuburg's Avatar
 
Join Date: Jun 2015
Location: Raleigh, NC
Posts: 332
Default Re: Fordomatic: Are there different output shafts for different Fordomatics?

Never mind. I took another run at it and got the drive shaft installed.
zuburg is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 01-22-2021, 04:05 PM   #3
rotorwrench
Senior Member
 
rotorwrench's Avatar
 
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,369
Default Re: Fordomatic: Are there different output shafts for different Fordomatics?

From info I'm finding (parts book & internet) the original slip yoke depended on the engine installation and associated transmission. When the T-bird came out, they used the new medium case transmissions. The medium case came out for heavy duty applications like the 312 T-bird but the 292 also had the medium case PMB-C transmission. There were two PAW (PAW-C & F) and two PME transmissions (PME-B & C) used for 1956. 1957 had different part numbers. Most transmissions are similar but they changed to water cooled in 1956 so that would be a distinct difference between 1955 & early 56 and late 1956. I think the output shaft splines changed in 1957 to a finer spline with a higher count.
Early ones were likely 16-spline but there was a standard part (P/N B5C-4841-A) that was likely for standard transmissions and a heavy duty part (P/N B6S-4841-A) for 312 engines in T-birds, police cars, and others with the FOM and the overdrive T85 standard shift. The parts book doesn't list the spline count for the 1956 T-bird with FOM.

What is the spline count? Most of the differences between transmissions of the same basic type would have been for mounting and tail shaft length with consideration for speedometer gearing. Otherwise they are pretty much the same. If the spline count & diameter is a match then it may just be that the air gets trapped during installation and makes it hard to go on. Some manufacturers drilled a small hole in the knuckle plug so that it could breath.
rotorwrench is offline   Reply With Quote
Old 01-22-2021, 07:41 PM   #4
zuburg
Senior Member
 
zuburg's Avatar
 
Join Date: Jun 2015
Location: Raleigh, NC
Posts: 332
Default Re: Fordomatic: Are there different output shafts for different Fordomatics?

Thanks, as you can see from my second post, I got it installed. I did have 16 splines.
zuburg is offline   Reply With Quote
Old 01-23-2021, 11:27 AM   #5
darrell
Senior Member
 
Join Date: Dec 2010
Location: p.e.i.
Posts: 1,060
Default Re: Fordomatic: Are there different output shafts for different Fordomatics?

in 57 they all went to 27 splines for the output.
darrell is offline   Reply With Quote
Old 01-23-2021, 03:16 PM   #6
KULTULZ
Senior Member
 
KULTULZ's Avatar
 
Join Date: Aug 2012
Location: IN A 'GALAXIE' FAR FAR AWAY
Posts: 6,413
Post Re: Fordomatic: Are there different output shafts for different Fordomatics?

Sponsored Links (Register now to hide all advertisements)
Quote:
Originally Posted by zuburg View Post

Do different Fordomatics have different output shafts with a different number of teeth or size?

For example, would the output shaft from a truck have a different number of teeth than a Thunderbird?
Yes. Attached is an MPC application chart for 49/59 cars only -
Attached Images
File Type: jpg TRAN - Output Shaft - FM (7060) - 1949-59 MPC.jpg (35.7 KB, 18 views)
__________________
*****

- DISCLAIMER -

The above posted information is in my opinion only (IMO) and may contain copy and paste material(s).

In addition, any above tech information is supplied in good faith. No responsibility implied or otherwise can be accepted for the way others use or interpret provided data.

Your experience(s), opinion(s) and mileage may vary.

DIAGNOSED CDO - (OCD In Correct Alphabetical Order)
KULTULZ is offline   Reply With Quote
Old 01-23-2021, 03:43 PM   #7
darrell
Senior Member
 
Join Date: Dec 2010
Location: p.e.i.
Posts: 1,060
Default Re: Fordomatic: Are there different output shafts for different Fordomatics?

does anyone know where i can a u joint that will allow me to put a 57 yoke on a 56 driveshaft.i used to hear there was one.
darrell is offline   Reply With Quote
Old 01-23-2021, 08:43 PM   #8
paul2748
Senior Member
 
paul2748's Avatar
 
Join Date: May 2010
Location: Midland Park, NJ
Posts: 3,965
Default Re: Fordomatic: Are there different output shafts for different Fordomatics?

A shop that does drive shafts should be able to change the shaft to accept the other yoke . Or he may have info on a u-joint



Quote:
Originally Posted by darrell View Post
does anyone know where i can a u joint that will allow me to put a 57 yoke on a 56 driveshaft.i used to hear there was one.
__________________
48 Ford Conv
56 Tbird
54 Ford Victoria
paul2748 is offline   Reply With Quote
Old 01-24-2021, 02:45 AM   #9
KULTULZ
Senior Member
 
KULTULZ's Avatar
 
Join Date: Aug 2012
Location: IN A 'GALAXIE' FAR FAR AWAY
Posts: 6,413
Post Re: Fordomatic: Are there different output shafts for different Fordomatics?

Quote:
Originally Posted by darrell View Post

does anyone know where i can a u joint that will allow me to put a 57 yoke on a 56 driveshaft.i used to hear there was one.
Try this - https://www.dennysdriveshaft.com/c13...9_x_3.625.html
__________________
*****

- DISCLAIMER -

The above posted information is in my opinion only (IMO) and may contain copy and paste material(s).

In addition, any above tech information is supplied in good faith. No responsibility implied or otherwise can be accepted for the way others use or interpret provided data.

Your experience(s), opinion(s) and mileage may vary.

DIAGNOSED CDO - (OCD In Correct Alphabetical Order)
KULTULZ 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 04:55 PM.