Parabolic springs sagging on one side

Hi all i recently rebuilt my series 3 Land Rover Regular on a new chassis, this solved almost all problems in one go, but for one. She still leans on the drivers side by about 2 inches, this was traced to the rear right spring sitting lower than normal. After fitting a 1Ton LWB spring shackle the chassis sits perfectly level. But the rear right spring is now flat rear of the axle. They are 1500 mile parabolic springs only 3 years old. I've tried slackening things off and all the usual, but is it time for new springs?

It would seem you have a duff spring,just replace that one. What make are they?

I bet you couldn't guess but Paddock Spares and therefor Britpart.

I'm also concerned that parabolic springs are not handed, and so surely they are bound to fail like this?
Could i bye a heavy duty LWB rear right to compensate, or is this just over compensating?

Bite the bullet and buy GB springs. Job done.

Are you saying you've fitted a longer shackle to only one spring? I would try and solve this first. As you now have effectively different length springs form side to side, with different amounts of travel. Also remember as the axle goes up and down, it also moves forward and backwards. Having different length springs will mean the axle probably isn't sitting true.

As for parabolics. Really depends what you are after from the vehicle. Personally if I had the money I'd buy Heystee springs. They are the best as far as I know, but they are pricey. Failing that, Rocky Mountain Spares are good and are indeed what I bought.

complain to seller ,1500 mls....................

I'm fairly sure but not certain that my paras were handed when I fitted them but it was 15yrs ago and she's long gone now.
Got them from British springs I think they were called, in Bridgenorth Shropshire.