Jump to content
Sign in to follow this  
Farmall1212

B67 rear end model identification

Recommended Posts

Just got a B67 and it does not have the center section in the rear. Axles are there. Any idea where I can find a tag or stamping to determine what I need? Did they all have the same rear just different ratios? I am going to use this as a site truck in the mountains so I don’t need it to be brand new. It does have Mack stamped in the rear cover which is welded on and is not removable is that helps in identifying. Can I swap it out with a newer style that drops in From the top? This one comes in from the front. Thanks 

Share this post


Link to post
Share on other sites

Could be either a single, or double reduction differential originally. Do yo have the driveshaft available with the truck? If so and you'll relay the distance from the center of the rear universal joint to the rear end housing face, one can figure out what was originally there. Most likely a dual reduction unit as several were. There may be stampings on the right axle tube viewed from the rear also that would identify it. 


Dog.jpg.487f03da076af0150d2376dbd16843ed.jpgPlodding along with no job nor practical application for my existence, but still trying to fix what's broke.

 

 

Share this post


Link to post
Share on other sites

Sweet! I do have the driveshaft but it will take me a few days to get it measured. I will post once I get the dimension. Thanks 

Share this post


Link to post
Share on other sites

Finally got that measurement. It is 23” from face of the rear to center of the driveshaft. With it being that much space I would think it would be double reduction but would appreciate any help identifying. Thanks 

Share this post


Link to post
Share on other sites

Yes, I agree with a double reduction unit. I'll measure a single reduction unit I have but I'm thinking it's closer to 18", or 19".


Dog.jpg.487f03da076af0150d2376dbd16843ed.jpgPlodding along with no job nor practical application for my existence, but still trying to fix what's broke.

 

 

Share this post


Link to post
Share on other sites

look on the rear pass of rear housing, the flat part to the right of Mack stamped on the tube. should say 507 508 512 . the bolt pattern is all the same single or double reduction. even some newer  Mack rears that were off brand housings were the same bolt pattern. deciding factor is will your axle splines slip into the rear


post-6-0-64947600-1408238925_thumb.jpg

Share this post


Link to post
Share on other sites
7 minutes ago, Maddog13407 said:

look on the rear pass of rear housing, the flat part to the right of Mack stamped on the tube. should say 507 508 512 . the bolt pattern is all the same single or double reduction. even some newer  Mack rears that were off brand housings were the same bolt pattern. deciding factor is will your axle splines slip into the rear

Exactly. His measurement from the center of the rear universal joint however will suffice and either will slip into the housing but installing a single reduction into where an original dual reduction carrier once mounted will take driveshaft modification to lengthen and conversely the other way.


Dog.jpg.487f03da076af0150d2376dbd16843ed.jpgPlodding along with no job nor practical application for my existence, but still trying to fix what's broke.

 

 

Share this post


Link to post
Share on other sites

Which is better single or double? This will be a site truck in The mountains so the lower the ratio the better. How much newer of a rear fits? Do you think the newer style that drop in from the top would fit if I changed the whole axle? I can get one of those cheap. Not looking to put a lot into it. 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help customize your user experience here on BMT. You can adjust your cookie settings to your preferences if you like, otherwise we'll assume that you're okay to continue.