Hi,
I understand series 3 xj6's are a good source to upgrade front hubs to get better brakes on my s1 xj6. Would a 1987 Jaguar XJ40 3.6 L Sovereign be a reasonable candidate to steal some front hubs from?. Im stealing the back for outboard brakes, might steal the front too if it would work.
Glenn

 

I'm going to say no... The suspension on the XJ40 was completely redesigned, so that none of the parts should be interchangeable...
I'll attach some photos.. These are off an X300, but similar to the XJ40... (I think)..
These will show the difference of the design of the upper wishbones...
When you are doing the changeover from the S1 to the S3, you have to change the uprights and axle carriers...

David
shop.EverydayXJ.com

 

Here are some of the Series 3 Front Suspension... I'm thinking there is enough of a difference that the axle carriers would be different as well..

 

Thank you.
Looks like i should keep searching.

 

You need to complete knuckle, thats everything between the ball joints, from a Series 3, There are a few key differences. The series 3 inner wheel bearing is larger, the wheel seal actual works, the brakes are 4 piston with vented rotors. Those are few but significant differences. You can get the same upgrade from mid 80's and later XJS. They are all the same. Also whilst you are working the suspension. Upgrade the upper control arm bushes to urethane because it make a significant difference. This is one of the few areas where urethane improves performance with out additional harshness.

 

One tidbit to be aware of.....which I think ICS might've been referring to.....

On the Series III cars there are two different upper control arm specs.

Presumably, almost certainly, you'd get your conversion parts from a single car so you'd have a matched set. But, on the odd chance you assembled your conversion parts from two or more cars you'll have to be careful or you'll run into wheel alignment/geometry problems.

From memory....

The 6-cylinder cars are broken down to early and late spec arms, with the breakpoint being 1983 or so.

All the V12 cars used the same upper arms.

The 'late' 6 cylinder upper arms are the same as the V12 upper arms.

The V12 upper arms, and late 6-cylinder upper arms, are the same as the XJS upper arms.

The accuracy of my memory can be double checked if the need arises but the important thing to remember is that two different specs exist.

Cheers
DD