1. (fixed in 13.5) MAZ had double wishbone suspension. Lower wishbone is longer than the upper one, therefore wheel camber should change as suspension compresses and extends.
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Sadly on ZiKZ currently camber stays the same at all times:
Mudrunner had that done right:
You got it right on DAN, so I don't know what went wrong with ZiKZ:
2. (fixed in 13.5/13.6, I guess?)Track width (mesured from the wheel center) should change during suspension travel. Farther the suspension goes from its neutral position the narrower track width gets:
3. (fixed in 13.6) Wishbone arms get stretched and thin during suspension travel as can be seen in this clip:
Youtube Video
This is mostly related to problems listed above (#1 and #2). Wishbone arms are not supposed to stretch and change length.
4. (fixed in 13.5) Rear suspension is slightly lower than the front:
(one red line is lined up with top of the frame and second red line is lined up with tyre contact point. Both green and blue lines are same lenght.)
5. In Mudrunner you could see driveshafts spinning:
Youtube Video
6. I had a suspicion that the wheels are slightly too small. I did some research and found the real MAZ tyre size to be 500-610/18.00-24/ which equates to a tyre diameter of 1600mm. That's 62.99 inches while ZiKZ has wheel diameter of 61 inches in the game.
(source: https://www.perthmilitarymodelling.com/reviews/vehicles/miniarm/ma_b35132.html)
To make sure I took a screenshot of ZiKZ at FOV set to 2 and compared it to the MAZ 537 blueprint:
As you can see, the wheels are indeed too small. That comparison also shows - as I wrote earlier (#4) - that the rear suspension is lower than the front (rear too low, front too high).
7. Steering rods collide with the frame. There are holes in the frame where they are supposed to go, but they completely miss those:
Youtube Video
(Thanks to Jotaro from Discord for pointing that out)
8. Driveshafts don't spin at low speeds:
Youtube Video
Working properly in Mudrunner:
Youtube Video
9. (Fixed in 13.6) Rear axles on the diff-side are connected in the wrong place and collide with the frame when suspension moves:
https://streamable.com/x21pq7
After closer inspection it seems that left axle is connected to the diff on the right side and right one to the left side...
(Thanks to Jotaro from Discord for pointing that out)
EDIT: Forgot to add #5
EDIT2: Added #6
EDIT3: Added #7 and #8
EDIT4: Added #9