First start with you car on a level surface,you will need a 17mm allen wrench to remove the plug under the pan,let it drain,inspect the magnet in the plug for any large objects,clean and re-install plug,use the same 17mm remove fill plug on the left side of the main case,some of the early ZF's have a 90 deg.pipe fitting you just remove the cap to fill,use 3,5 liters or just less then a (1)gallon of trans fluid.Pour in slow or it will act as it's full and flow out.
That is a good sign, but you don't if the ring gear bolts are wired,if you remove the bottom cover and they are wired I would keep driving.If not it's good insurance and will save you money in the long run.
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