MS: I am aware of the spacers and already have them.  I didn't think of the exhaust, so thanks for that "heads-up."  Also, thanks for the comments.

Well it has taken some time, but finally getting some more noteworthy work done.

Some more pics of the long ongoing body work and pain prep.

Test fitting the factory wheels from a 2009 Mustang (which is my other Mustang) on the rear end of the 1969 project.

The stock 1969 8" rear end after the addition of the GT2008-RMS.  I went with 2009 GT parts (rotors, pads, calipers, hoses, etc.).  I utilized 2.75" exhaust U-bolts to mount the ends of the Duralast hoses to the rear end.  I modified the Duralast hose ends by cutting one side off and drilling the other with two holes (only needed one, but did so for flexibility)  I already had SS brake lines and a local shop was able to bend, cut, and bubble flare them for me.

I utilized RTV where the back seal (inner) one would have gone.  I installed a new front seal (outer) and the original dust/water cover. All fit fine and look good.

70 Coupe wrote:

I am going to look into trimming my rings and make them work. Not saying anything bad about Steves parts but we are working with 50 year old parts and trying to mate them with newer technology so some fitment issues are bound to rise.

Thanks for all your impute 70 Coupe!

I have a 1969 Mustang with original rear end (8” small bearings) that I am putting a GT2008-RMS kit on.  Everything mocked up well before pressing the bearings (didn’t use the centering rings for this).  After install, I noticed that my rotor's wobbled.
 
I believe the problem is the rotors were not sitting flush against the axle flange.  I noticed that when I removed the centering rings the rotors did fit flush against the axle flange and the wobble problem disappeared, but now there is nothing to keep the rotors centered.
 
When I pressed on the centering rings they were a very tight fit and I don’t believe I got them all the way flush with the axle flange.
 
The rotor center hole is tapered on both sides (deeper in the back) with a “shelf” between the two tapered openings.  The centering rings are not tapered.  The centering rings also do not fit all the way into the rotor (meaning they won’t pass all the way through the center of the rotor).  I checked to make sure the centering rings will sit flush (when inserted from the back of the rotor per instructions) into the 2009 GT rotors I purchased, and they do. 
 
With that being said, I have the following questions:
-Are the centering rings supposed to be tapered?
-Are the centering rings supposed to fit really tight on the axle hub?
-Did I not press the centering rings on far enough (not flush with the axle flange)?
-Has anyone else experienced this problem?
 
Thanks all,

I'd like to tag on to this topic.  Any recommendations for what brand/type of fluid to use in my differential?  My recently rebuilt and dry differential is essential a stock 1969 Mustang rear end.  Any suggestions (and why)?  Thanks.

Lots of work, great results, nice video.  Thanks for sharing.

Thanks MS!

almcgee wrote:

Outstanding; good looking project.
 

Thanks.