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This looks like spring sag.

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Simmo

Simmo

Jedi Hopeful
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I have just about finished the rebuild on my 3A Right Hand Drive. Before I started I noticed that there was a droop to the driver’s side at the rear, approximately 1”. I blamed this on the fact that the springs were worn out and replaced them with new ones from Moss.
Now the car is back on the concrete, with the new Dayton wheels on, I notice the droop is still there but only about ½”.
I have read all the articles that say Triumph used to compensate for passengers weight buy adding what amounts to a lowering block on one side and I am guessing / hoping that is my problem but thought that I would publish these thoughts to get any further helpful comments.
 
Did you compare the new springs before installation? I believe they are normally supplied without spacers, but there have been a lot of reports of problems with ride height with new springs.

Are you seeing the droop at the body, or at the frame? Do you have any way to check corner weights? (Somewhere, I've seen a tip on how to do it with bathroom scales and 2x4 lumber, but I have no idea where I saw that.)
 
Actually Randall you have got me a bit there. Yes the two springs were the same. I compared them by putting one on top of the other.
I have only made measurements on the body. i.e The top underside of mudguard to grond and the sill panel to ground.
I would be surprised if body corner weights were different but I could borrow some heavy duty scales and give it a try. I wonder if a full tank of Gas would make any differance.
 
Since the gas tank is positioned in the middle of the frame it should have no bearing on the right or left droop.

Good luck, Tinkerman
 
Not ever tried it, but I would think you could measure spring sag by measuring the distance between the middle of the spring to the ground, and the ends of the spring to the ground on both sides.
 
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