The existing XKE trailing arms, being rubber mounted don't allow for any adjustment in fore and aft movement of the rear axels.
Soooo I removed my rusted and worn arms, ( I had to slit cut the cups off the floor mounts they were so rusted in place). I cleaned up the cup welded the slit I'd made in removing it and fabricated new plates to be welded to the sides of the cup. Take a look at my detailed drawing how to. The other pictures show the 1" tube arms, the nuts welded to the ends of the tubes, the mount for the sway bar attachment, and the poly joint at the front and hemi joint at the axel.
This fabricated bar gives free movement to the axels while providing positive axel location for tractive forces. The fabrication cost less than the rubber replacements and gives better results. Tell me what you think.

 

Might give a harsher ride, is there any give at all around the cup?? A lot of shear energy directly to the cup mounts is occuring.

 

Jaguar originally designed the cup mount to take the fore and aft loads of the car, Soooo
I haven't changed that! I provided a rubber (poly) front "eye" at the cup mount, this is much more ridged than Jags soft donut. The cup is a steel to steel fit just the way Jag designed it!...

 

The fore and aft movement was cushioned by the rubber bushing, to stiffen the ride the would turn the bushing 90 degrees to alter the position of the "holes" that allowed the give. A hard connection between the axle (which has a small bushing) and the cup will put a lot of shear force on the cup and its mount, especially if the plate is only riveted with no internal bracing. I have seen the cups and mounting area deformed and cracked even with the stock bushing. WIll give a much more responsive ride however

 

The forces that apply to the floor mounted cup that Jaguar designed into the car have not been increased ! Those forces are still cushioned by a rubber bushing in the forward eye mount and the imposed load is still correctly distributed by the
cup and its attachment to the floor. If you have experienced damage to the mounts in an XKE in this area perhaps the floor reinforcing plate was rusty or the rivets / welds had been compromised. This CUP MOUNT is the only way acceleration and braking loads are transmitted to the car, it is its inherent design.

 

This I know, my concern was the photo shows the arm welded to the cup which means there is no "cushion".

 

 

and there is no bushing on the trailing part of the radius arm either. All forces will be direct on both ends which will be a great deal of stress on there areas normally protected by the rubber bushing: make for a vere stiff and reactive rear end.

 

Hey Jagrck: Just behind the cup between the two arms that are welded to the cup is a 1/2" thick walled rubber bushing. I show it in the drawing, where it is clearer than the photos.
Did you not get a chance to open the PDF drawings than accompanied the posting?

felinecat

 

The forward end of this modification provides a polyurethane bushing (just behind the cup),
this gives better road noise insulation. The rear mount of this radius arm has a hemi joint to give pivoting action to the half shaft but provides positive location to the axel at all times !
This system is used in a lot of competition Jags and also works great for hard street use.
This modification prevents unwanted "rear steering".