www.jec.org.uk

If someone has a long wheelbase series2 xj6 and could kindly take a measurement from the centre of the front wheel to the centre of the rear wheel i would be very grateful for the info.I have rebuilt the rear suspension and have struggled to reattach one of the radius arms to the floor dome.both of these have been rebuilt along with floorpans/jacking points and all fitted fine until the IRS was removed for rebuild.after struggling to attach one side i have a difference in the measurements from nearside to offside.a measurement from a car that is original would be of great help for me to determine what is occurring in my case.many thanks to anyone who might help.Eric.

Haynes lists 113.1" as the LWB wheelbase dimension. However, there will be some variation around that number due to the effects of ride height and rubber bushings. Mike.

Thank you for sending the info reg. wheelbase measurement .I will make another measurement and see how it differs.hopefully I am not looking at a huge problem.regards .Eric

I can't see how that could go wrong. It might be worth posting some photos of the various mounting points (rear subframe to body and so forth) to see if we can see something obvious. AFAIR there are no adjustable bits on the rear suspension or subframe that could make that degree of difference.

The Jaguar factory manual shows the wheelbase as 112.87", and offers instruction on measurement.
The problem is most likely a result of incorrect positioning of one / both radius arm posts. Unfortunately the manual doesn't seem to provide any positioning guidance:

Thinking about it again, one possible very simple issue occurs to me. It is possible to fit the rear subframe mounts the wrong way round. Try checking their orientation. Mike.

A very big thank you to you both for the further info and trouble you have taken to reply.I will uses the info and suggestion of checking the mounts as I'm sure all lined up fine before the big rebuild of the irs.I went to the a lot of trouble when lining things up prior to welding the new radius arm/jacking point panels .it's all a long time ago though.you wouldn't believe if I told you I did all the structural work and spraying some 24 years ago.children and moving/life stopped me carrying on but as I was locked in my wife suggested I get on with it before I'm too old to.I rebuilt the rear suspension 4 years ago and it's been waiting to go in .that's why I'm head scratching but will get it sorted.thanks again.I've been doing lots of other during past 4 months including complete engine rebuild and auto box is with a specialist at mo.I hope to get it running again this year.it's been a very long time since i drive it with my wife some 30 years ago.