1974 vs. 1983 trailing arms... (?)
 

..are there any differences I should know about between 1974 vs. 1983 rear trailing arms... or are they the exact same "banana"? Looks to me like they are cast from the same mold w/ just the date numbers different.
Thinking of switching out my '83 with a pair of '74 since the '74 have been cleaned and "shaved" Besides, I suspect they have newer bearings, I can see they have longer studs.. and they are CLEAN By 'shaved" I mean trimmed of all superfluous do-dads : little things have been cut-off, like the brake duct mounts etc. probably since someone was saving weight at some point - these came off a track-only animal.

Trailing arms difference........
 

JT,

The sway bar drop down linkage connections for the pre- SC’s trailing arms are different from SC’s and later models. This is most notable difference between the pre-‘78 TA and the ones used in SC’s and Carrera 3.2 suspensions.

I had my ‘77S trailing arms and spring plates replaced with the later trailing arms and adjustable spring plates from a Carrera 3.2 car. Why are you backdating your suspension?

Tony

see Figure 6 in this pdf

https://members.rennlist.com/911pcars/911AlloySuspAll-a.pdf

Fig 6. yes, exactly what I was looking for, thanks!

"Why are you backdating your suspension?" Yeah, good question! ..just debating it, really. This was someone else set -up which I bought used. The old style sway bar links have been completely cut-off (of the'74 Banana arms ). I guess it was in the way with the rest of the system which had used modern aftermarket stuff: Smart Racing- sway bar and Elephant adjustable spring plates.

From the Elephant web site:" Factory sway bars on model years ’69-’77 will physically interfere with the ASP. It is recommended to fit aftermarket sway bars, or sway bars from ’78-’89 model year. Alternatively, stock ’69-’77 drop links can be extended by cutting, then welding steel stock to extend the spacing between the bushings to eliminate the interference."

Which is NOT exactly what I have here; the configuration of Elephant adjustable spring plates allows for a knuckle to be mounted directly on the trailing arm where a sway bar can be attached.

As far as the Smart Racing bar goes I was going to use a totally different bushings where it attaches to the body of the car .. since S/R-bar has very little "bush” ..it's essentially bush-less in fact. There is a "knuckle-thing" to attach the sway bar mounted on the trailing arm… I will post phots to clarify all this! Thanks.