I want to go with a boxed lower control arm and rear sway bar in my 65 Chevelle. Can anyone tell me if other "A" body cars like a GTO or Cutlass share the geometry of this suspension so that I can expand my search?

Thanka in advance for any replies.
Eric

To quote the THE Chevelle ONLINE INTERCHANGE MANUAL at http://www.angelfire.com/tx/lonestarclassics/chassis.html

"The rear trailing arms (or control arms) consist of four arms that connect the rearend to the frame, and the setup consists of two long and two short arms. The lower trailing arms for use with a sway bar is unique, and the usual characteristics is that the arm is boxed and gussetted. The upper arms vary, and there are two part numbers in the Chevrolet Parts Interchange Manual that separate 1964-67 and 1968-72 Chevelles and BOP A-Bodies.The lower arms are interchangeable (all years), and a car that did not have a sway bar can be modified to fit.
1973-77 lower rear trailing arms will bolt in, if using either 1973-77 rear anti-sway bars, or 1977-96 B-car sway bars, common on vehicles like Cadillac limos and police-optioned Caprice 9C1s.

There are 201 1965 Chevelle SS 396s (RPO Z-16) had unique lower arms, which is a one-year item.

Upper trailing arms of 1964-67 vintage interchange, and they are 1" shorter, which will not fit into 1968-72 A-cars. 1968-72 A-cars have longer upper arms, and when switching upper arms, be careful here, in which the pinion nose angle might be affected. According to Inside '64 -- '72 A-Bodies, there are 10 different rear upper control arms offered. Other characteristics include clearance bulges, common with 12-bolt differentials in A-cars, and adjustable upper arms, optioned on Oldsmobile A-cars (F-85, Cutlass). 442s had boxed upper arms, and this is a sought-after item in a restoration.

On 1968-72 A-cars, like high-performance, 4-speed, and Monte Carlos/Grand Prixes, there is a triangulation brace bracket that is standard. This stiffens the chassis, and tubular versions are available from Edelbrock and Hotchkis Performance.

Note: the trailing arms fit either side, and this means that the left upper arm will fit on the right, and vice versa."

Hi Eric,
Why don't you just box yours and buy a new sway bar from GM? They're like $65 from GMPartsDirect.com.

Cam