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I'm not aware of any given shock absorber have multiple possible possible collar mounting points. But different brands sometimes have different mounting points. I think it comes down to E-type shocks being sold as sedan shocks, or something like that. I'm just two sips into my first cuppa coffee so the brain isn't alive yet.
Search "Shock absorber collet" or similar. This has been discussed before, most likely in the XJS section.
Just completed KYBs into rear of of Ser II saloon and there was zero change in ride height. I kept the 100K mile original rear springs on them.
Since my car visually is flat, I would ask whether perhaps the front of your car has a problem making it sit too low in comparison to the rear?
Thanks for the replies, the front looks about right just seems to have a rear to front rake that I'm not a fan of. It must be the springs.
FYI
If the ride height was OK before new shocks were fitted, then it is the new shocks that are the problem. A given spring will always be at the same length for a given load; BUT the combined length from the spring ends on the shock assembly to the mounting eyes WILL change the ride height if those lengths combined are longer or shorter than the old shocks lengths were.
Here's a pic of mine with KYB'S all around, it sits about right for me as I want to keep it stock looking. Greg is right about different manufacturers could get the fixing point on their shocks slightly different than Jaguar. Another possibility might be the influence of the gas pressure in the shock. If you've ever installed gas shocks, you remember how hard it was to compress them enough to fit. I'm going to guess the gas pressure is pushing 20# or more, and there are 4 of them in the rear, 80# of lift might affect the ride height a little.
It looks like you have the incorrect lower shock spring perches. Try cleaning them and see if they are silver or black. They KYB ones appear and are painted clean silver exactly like the shock. Yours appear old and full of crud as if they've been reused from the older shock that has a different design.
BTW... The Aston Marton DB7 Vantage v12 used the Jag IRS and came with Bilstein shocks that did have 3 grooves so you could move the snap-ring that held the lower spring perch into three different positions. This feature never appeared on a Jaguar AFAIK.
Originally Posted by Devo
Are there multiple mounting points for the lower spring collar on the Rear shockers, car seems to be a little high at the rear
It could be that whoever installed the shocks used the old lower mount thinking they where the same or wanted the higher ride height.
The car has new KYBs all round and does not sit level.