I upgraded the entire suspension on my ‘65 Catalina last fall. It was costly and quite the experience to get it right.
The major issue was the rear springs.
First 65-6 rears are unique to those 2 years and Pontiac B Body only.
Second, very few manufacturers or suppliers have them.
Third, most sell the HD 140 lbs/in rears, which were standard in the longer WB (Bonneville, Star Chief).
If you buy from Eaton Detroit, ESPO, or PY they will be HD rears. Sounds great until you connect the shocks and discover they’re now too short to provide ample shock extension. That can be solved by getting. Long shocks. 24” extended works. Monroe makes them and others. Less than 22” they will top out.
The upside is the stance is improved the downside is you’re changing static pinion angle and control arm angles. That may or may not cause vibrations from the U joints.
Found only one mfr. that can make the original 122 lb/in standard rate springs.
Coil Spring Specialties in Kansas.
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65 Catalina 2D Post
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