steering and suspension Long neck diff mount

[Hans]

Any ideas on how much vertical travel is acceptable on rear mount for long neck diff??

[Mike Self]

I didn't think it was supposed to move at all, other than a small amount due to compressing the rubber mounts.  That's why there are CV-jointed axles in the back, since the diff is rigidly mounted to the body and thus isn't unsprung weight.   The rubber mounts are just to prevent diff noise from being transmitted to the car body.

 

Seems to me if you can push up and down on the diff and see it move more than a couple of mm, that's too much.  Speaking from theory, not practical experience with a longneck, but they work the same as a short neck diff as far as how it's mounted to the body. 

 

mike 

[Hans]

It has one mount point on the back of the diff, whereas don't short necks have two mount points on a bracket? It moves a bit if I use the floor jack.

Edited June 18, 2015 by Hans

[Hans]

Mike

Just checked realoem. Weird. It shows long neck diff alone with one rear mounting ear; but mounting parts show bracket with two mounts a la short neck. Now I have a 2000CS, which may be different. Perhaps 2002 didn't have single mount with long neck.

[jgerock]

Subframe of a 68 1600 (longneck diff)

Rear view

This car looks to have a similar mount as a short neck equipped car (but I don't see the offset)

 

Edited June 19, 2015 by jgerock

[Hans]

Where old long necks go to die. I see the dreaded early half shafts! I'm rebuilding my fifth one.

Thanks for the pix. Appears 1600/2002 long necks use different rear cover than NK models. I'll see if someone can help on NK forum. Mount appears to cross ref to early six cyl. models.

[gracer]

The rear mount for a NK model has only one pickup point.

The rear mount for a 02 model has the same as the short neck.

It is a simple process to change from one to another.

Just change the rear cover. G