Re: This was in my email today....

Posted by BH On 2014/6/5 9:11:24

Quote:
Yes, the design shown in the scans kindly provided by member 56executive is of the later design introduced with the 57th Series. The 58th Series also used this type of clutch, but somewhere during the run, the angle of the pinion ramps on the diff case was changed. (See this site's Service Index for bulletins on that.)

While this Dana document includes a service procedure for handling extreme chatter, which involves removal of the clutch pack, pages 8-9 are missing from the aforementioned post. Although the 56 unit used cone-type clutch, those missing pages MIGHT provide some clues as to the nature of fasteners, torque, etc. for the 56 design.

Otherwise, this information may only be relevant to owners of 57-58 Packardbakers - and only those with TT, which could prove to be a rather small market segment. While it's clearly a good reference for a technical archive to have on file, I doubt if sales would even recover cost of reprinting.

Meanwhile, the installation procedure, which is presented first, makes me wonder if Dana was marketing the Powr-Lok diff as an upgrade - though it appears to be quite a chore to install. I then have to wonder if a later disc-type diff was available that would fit the axles used in the 56 models (both Junior and Senior types).

However, I have to temper such hope with the fact that the (late) original owner of a 56 Caribbean convertible previously told me that (many years ago) Dana shipped him a standard diff to replace the failed TT unit when he restored the car, which was ultimately donated to the Warren museum.