Originally Posted by cool rockin daddy
Where the axle tubes meet the "pumpkin" weld the joints completely. They are held in place by heavy duty spot welds right now. Where the spring perches meet the axle tube, make sure they are totally welded.
Exactly. I think they missed on the spot welds quite a bit at the factory. My '69 and my '72 both had tubes that were just pressed in, and both of which spun in the housing, one with a stock 350 and one with a 230.
Another good idea is to use U-bolts to attach the lower spring mount plates. The stock T-bolts are a factory cost-saving measure, and if the perch comes unwelded from the axle tube, that corner of the car goes straight to the ground. Heavy traffic, sparks, etc.
Welding the perches is good, but U-bolts take the strain off the perch welds, and will support the car if the welds give up. GM started using U-bolts again in the later Novas, one on each side. I used 2, just for good measure.