84 - 89 300ZX (Z31) Rear Camber Modification
Photo Essay.


The factory Nissan 84 - 89 300ZX rear suspension has only an adjustment for toe-in. For those owners that wish to lower the rear of their car, a problem occurs due to the lack of an adjust- for camber. When the rear of the car is lowered, the top of the rear tires point in to the center of the car, producing negative camber. To correct this problem, one can modify the rear crossmember to allow for camber adjustment. The simple method was out line by Ken85T. A complete detail set of guide- lines can be found at AZ-Zbum's web site and a write up I copied from the old Z31.com achieves before it went to the new format.

I used this information to do my own modification. The main reason I chose this method was to have a finished appearance look as “factory” as possible.

The following photos outline the steps I took to accomplish my goal.

 

#1  Camber_mod-00.jpg (21047 bytes)


This is the stock mount for the toe-in adjustment.
The camber mounts will be similar with the
exception the adjustment slot will be vertical.

 

#2  cambermodparts.jpg (25656 bytes)


To accomplish this modification, these are the parts required.
Nissan Part # 55045-01P10
Nissan Part # 55226-10V00
Nissan Part # 55227-10V00
Nissan Part # 01225-00032

From Bruce Titus Nissan, Tacoma, WA
Prothane Part # 14-303 is part of their kit # 14-2004

 

#3  Adj-Camb-Mount-w.jpg (28294 bytes)


The first thing I did was make a detailed drawing of the stock inner mount.

 

#4  Camber_mod-01.jpg (42956 bytes)


From 2 inch by 1/8" flat stock, I cut four 2" blanks.

 

#5  Camber_mod-02.jpg (40859 bytes)


Next I measured and marked the side retaining walls on each of the 2" side at about 0.320"; clamped in a vise at the mark, the exposed area was heated to red hot.

 

#6  Camber_mod-03.jpg (41189 bytes)


Once heated, the side wall was hammered over.

 

#7  Camber_mod-04.jpg (105170 bytes)


Each mount was notched next to the wall in compliance to the drawing.

 

#8  Camber_mod-05.jpg (33822 bytes)


The second step was to remove a small triangle next to the above notch using a 4.5" right angle grinder with a cutoff blade.

 

#9  Camber_mod-06.jpg (36890 bytes)


The corners were tapped into place. The mounts were turned upside down and the exposed seam was MIG welded and ground smooth using a 80 grit "flapper" sanding disk.

 

#10  Camber_mod-07.jpg (34068 bytes)


Before drilling any holes, I made a hole punch template.

 

#11  Camber_mod-08.jpg (29184 bytes)


To insure the holes I drilled were correct, I performed a number of tests.

 

#12  Camber_mod-09.jpg (26518 bytes)


After I center punched the marks for the holes, I drilled pilot holes using a 1/8" bit.

 

#13  Camber_mod-10.jpg (40634 bytes)


Each mount was then drilled using a 9/16 (0.563) " drill bit.

 

#14  Camber_mod-11.jpg (26232 bytes)


All four mounts drilled and ready for clean up and welding.

 

#15  Camber_mod-13.jpg (47830 bytes)


The holes were completed using a table mounted jigsaw.

 

#16  Camber_mod-12.jpg (32182 bytes)
#17  Rear-subrframe-mod-w.jpg (25641 bytes)


Diagram showing the location of the new mount in relationship to the original bolt (pin) hole in order to reduce negative camber.

 

#18  Camber_mod-14.jpg (44534 bytes)


Lines were marked perpendicular to the sub-frame bushing journals.

3D image here.

 

#19  Camber_mod-15.jpg (217959 bytes)


After test fitting, the mounts need a bit of adjustment ...

 

#20  Camber_mod-16.jpg (150319 bytes)


... as well as an area close to the sub-frame bushing journals.

 

#21  Camber_mod-17.jpg (198376 bytes)


To mark the inside mount, I had to rig up a couple of small 3/4" boards clamped to the sub-frame bushing journals in order to get my square correctly positioned for marking.

 

#22  Camber_mod-18.jpg (172762 bytes)


After welding, the holes on the mounting tabs were opened to fit the openings on the mounts and enlarged to 0.575 to fit the 0.544 diameter bolts

 

#23  Camber_mod-19.jpg (177207 bytes)


The whole sub frame was wire brushed to remove loosely adhering paint, rust or weld residue and sprayed with one coat of two part epoxy zinc chromate primer .
3D image here.

 

#24  Camber_mod-20.jpg (154816 bytes)


Close up of the mount.

 

#25  Camber_mod-21.jpg (184948 bytes)


Finished with two coats of two part acrylic urethane for a gloss black appearance .

 

#25  Camber_mod-22.jpg (21934 bytes)


Near OEM in appearance.

 

 

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