Front suspension differences between 73.5 and SC
 

pretty self explanitory title...

I was going to upgrade the 73.5 (Lil SOB) with the aluminum cross member...

are there any other advantages to later parts?
what struts came with the 73.5? I think I remember the casings being black...so can I assume they are Boge?
will bilstiens fit in there?

also what is the caliper bolt spacing on the strut?
can I use SC or 930 brakes?

Obviously I could answer most of these questions myself if the car wasn't in the hands of the paint-meister at automotive innovations

thanks

MJ

I'll have a go at it.

Both suspensions are basically identical except for:

Sway bar mount - SC factory bar is under the suspension. Early bar is through the body.

Control arms - Due to the sway bar mount, SC arms have a different configuration to mount the sway bar end.

Crossmember - SC is aluminum. 73.5 is steel

Brakes - Same unless the 73.5 has M brakes which have a 3.0" caliper mounting pattern (and solid rotors). If the 73.5 has A or S calipers, the spacing/brakes/rotor are the same.

Sheet metal cover under steering rack area - Different

Struts - Early may be Boge, Koni or Bilstein. SCs are Boge or Bilstein.

Age - SC is newer, maybe less wear to wheel bearings, ball joints

Someone should verify my attempt to clarify the above.

Sherwood Lee
http://members.rennlist.org/911pcars

PS: If the struts are Bilstein, replaceable w/Bilsteins. If the struts are Boge, can replace w/anything.

I believe Steve Weiner has posted his advice on the Rennlist BBS. You may want to do a search there.