Dan,

Please see these pictures. I think cross member is original 55411-E4100 because an earliest muffler hanger is used on the member,

and do not see any obstraction by the mounting insulator 55415-E8300/01.

I want to know what is a difference between the two cross members, shape ? or no- muffler hanger welded nut?

3rd picture is my 12/1971 Orange 240Z, this shows how an E8300/01 should be installed correctly.

4th picture is my 01/1970 Z432, cross member is 55411-E4100, it has two welded nut , right one is for the hanger of dual exhaust system

standard for Z432, an optional for Z, Z-L . 

Kats    

Pictures from the service manual,

Second picture, you can see the new muffler hanger , new curved rear cross member, and the mounting insulator 55415-E8300.

Kats

FWIW, there's a vendor in Japan currently offering the 240Z early-style insulator (55415-E4102) for low, low price of just 28,000 Yen (that would be about US$375!)

Here's another photo that I forgot to post yesterday that illustrates in pretty dramatic fashion how this insulator can collapse with age.  Not surprising, given that the cross-section of the rubber core necks down to what looks like only 1/8" in width...

(As before, my apologies for not being able to credit the owner of this photo.)

If you go back and look at Photos #1 and #2 of my earlier post, you can see how the later-style insulator's design changed so as to significantly increase the width-wise dimension of the rubber block at the front.  Perhaps this was an effort to reduce the insulator's vertical compliance.

The crest built into the top of the rubber block indicates that insulator was obviously designed to bottom out.  Still, it doesn't look like you'll be doing this insulator any favours, long term, if you use the diff casing as your rear jacking point.

@HardwayOn a related point, Hardway's recent post in which he stuffed coolant hose into the insulator opening to (successfully) cure a diff 'clunk' issue suggests that his front insulator is now operating in a permanently bottomed-out condition.  Waiting to hear whether he reports any significant increase in gear noise coming into the cabin as a result.  If he doesn't, then that 'stuffing' fix may make replacement of a collapsed front insulator a non-issue.

On 8/1/2017 at 6:38 PM, kats said:

Pictures from the service manual,

Second picture, you can see the new muffler hanger , new curved rear cross member, and the mounting insulator 55415-E8300.

Kats

Kats, I have finally found all of the necessary parts for my differential relocation, and wanted to again 

thank you for helping me find a NOS diff. insulator.  

below, I wanted to include a picture of my restored mustache bar as I have, again, taken a lesson 

from you on how this should be done.

Thanks again, Kats.

 

 

Differential Relocation:

Hi, I’m resurrecting this thread. I am looking for an NOS diff mount, Part #55415-E4102. 

 

Does anyone have one?

Thanks!

I have one

On 8/1/2017 at 6:31 PM, kats said:

Digging up an old thread.  Anyone re-popping these exhaust hangers and associated exhaust hardware?  They appear to the same as the early 240Z hangers.