Jig for Lifting Rear

[AttyDallas (Paul L.)]

I noticed in the Jag factory repair literature it mentions NOT to just stick a floor jack and try to lift the back end with the jack plate against the rear differential, like with most cars. I assume this is due to the “floating rear suspension” configuration w. multiple u-joints. Lifting the car directly against the differential may play havoc with these joints and/or the differential.

If a jack is used to lift the rear, the literature indicates a jig must be fashioned out of a section of 2 x 4 board with a cut out in the middle to go around the bottom of the differential so that the only points of pressure are on either side of same, against the rear cross-member only.

I was wondering if anyone who has constructed one of these jigs would care to share the dimensions of same here, i.e. how wide and deep should the cut out be to go around the differential? Once I have those dimensions I can (hopefully) have someone at Lowe’s cut me up a board to same.

[gregma (Greg (1988 XJ-S V12 Lucas))]

I just stick a one foot long 2x4 on my jack and lift up by the cage. I’m assuming that then pushes up on the subframe mounts, and lifts the body.

[Wiggles (Paul Wigton)]

@AttyDallas

I was wondering if anyone who has constructed one of these jigs

I think @John_Walker made one for his E Type, which would be similar.

[DavetheLimey]

Paul, the general idea is to prevent damage to the bottom of the “cage” which runs below the differential.
This jig is in the archives somewhere, IF you can find it!
I keep a paper file of “Useful Things To Remember” and took a photo for you!

[sloth]

Atty: Dallas:
This is an easy one…I did it myself… Harbor Freight sells a hydraulic platform for around $125.00.
The rear end cage fits perfectly and as you pump the bolt holes line-up perfectly. The platform has many other uses in your garage…
Regards, Sloth

[JimD_in_Alabama (JimD in Alabama, 95 V12 XJS Coupe, Marelli, LHD)]

You can probably pick up some scrap 2 x 4 pieces at some construction site. Get some short pieces around the sizes shown in the picture posted, and screw nail or wood glue them together.

[AttyDallas (Paul L.)]

Thanks, Dave (and everyone). How thick is the board that jig was made from, btw, if you know?

[AttyDallas (Paul L.)]

@sloth

Atty: Dallas:
This is an easy one…I did it myself… Harbor Freight sells a hydraulic platform for around $125.00.
The rear end cage fits perfectly and as you pump the bolt holes line-up perfectly. The platform has many other uses in your garage…
Regards, Sloth

Is that the “hydraulic lifting cart” they sell (two types) ?

[sbobev (Steve)]

This jig is in the archives somewhere, IF you can find it!

Why is “IF” capitalized. The advanced search function allows you to search anything.

[xj-s] rear end all back together

In reply to a message from Gourgen sent Mon 21 Mar 2016: I made up a small wood cradle from 2 x 6 redwood that fits the lower frame of the rear suspension assembly and attached to any standard trolley jack. It perfectly centers the load and leaves room to insert jack stands at the jacking points or suspension. I used it a number of times to jack up the rear of the car without damaging the lower plate of the rear end assembly. If I still have it, it’s up for grabs to anyone for the price…

and here is the album:

http://www.jag-lovers.org/snaps/snap_view.php3?id=1459365464

Note that the large image won’t display properly because the administrators are still working on migrating the 100,000+ pictures from the old site to the new one.

[sloth]

Good question the platform is about 36inches sq. And a arm raises the table.

The price when I bought it…125…

Sloth

[Norman_LUTZ]

@gregma

I just stick a one foot long 2x4 on my jack and lift up by the cage. I’m assuming that then pushes up on the subframe mounts, and lifts the body.

I have a permanent fitment of a 1"x1/4"x 9.5" lg. steel flat that is bolted on the rear edge of the frame using the rear 3 bolts.

[AttyDallas (Paul L.)]

@DavetheLimey

Paul, the general idea is to prevent damage to the bottom of the “cage” which runs below the differential.
This jig is in the archives somewhere, IF you can find it!
I keep a paper file of “Useful Things To Remember” and took a photo for you!

By “cage”, do you mean the “transmission drive shaft under-body cover plate” or possibly the “drive line cover shield plate”?

[AttyDallas (Paul L.)]

@sbobev

This jig is in the archives somewhere, IF you can find it!

Why is “IF” capitalized. The advanced search function allows you to search anything.

[xj-s] rear end all back together - #12 by equiprx

and here is the album:

http://www.jag-lovers.org/snaps/snap_view.php3?id=1459365464

Note that the large image won’t display properly because the administrators are still working on migrating the 100,000+ pictures from the old site to the new one.

Wow … that was one heck of a vintage thread from 4 years ago (back when we had a lot more posters to the XJS forum, apparently). Sad that it ended in a nasty quarrel. btw, whatever happened to “Dr. Quail” … ltns him on here.

[DavetheLimey]

By “cage” I mean the assembly that wraps around the complete IRS unit. The piece that can get damaged is called a “tie plate” I believe.

[PeterCrespin]

I have your alloy version Norman.

[AttyDallas (Paul L.)]

@DavetheLimey

By “cage” I mean the assembly that wraps around the complete IRS unit. The piece that can get damaged is called a “tie plate” I believe.

O.K… Sounds like more “Jag anatomy” for me yet to learn …

[Wayne_Canter (88 xj-sc cabriolet)]

My solution for tie plate replacement

Edit:
Bottom piece is aluminum plate it’s total thickness is based on the outer perimeter flange.
I may countersink the mounting holes if I can find proper countersink bolts