Here's how to adjust your steering box - late alloy one, but I'd imagine the earlier cast ones are much the same. A precondition of getting slop out of your steering is that all ball joints, coupler and swivel pin are in good shape. Also that your steering box isn't piddling oil out and suchlike. To service the box - perfectly possible if someone hasn't knocked a chunk out of the worm while parking - you need to take it off. Pop front drag link balljoint off, disconnect coupler, unbolt it and pass it through the chassis with drop arm still attached. Probably best to loosen the big nut first and retighten it when it's back on the van. Removing the drop arm is the hardest part. You'll likely need a press or a hydraulic puller. Don't try pulling it off when you're under the van: you'll get a face-full of exploding puller. Index marks on the arm and shaft help you put it back on in the right position. When it's off, you need to find the mid position of the box. The steering box is the centre of your steering universe, not the position of the front wheels. It doesn't matter which way the steering wheel or front wheels are pointing - nobody cares. Wind it lock to lock, on or off the van, and find the exact mid point. From memory, it's about 2 3/4 turns lock to lock. When it's centred, the pointer on the top dust seal should line up with the little square on the steering box casting. If it's not, turn it round until it is. The pointer/block will enable you to feel for centred-ness when it's under the van. This obsession with centred-ness lets you make use of a handy feature that ZF designed in: starting at about 180º either side of straight ahead, the box stiffens up slightly to stop you wandering. This preload is built in and we might as well make use of it. Adjustment: jack the front of the van up, centre the box (your steering wheel may end up wonky, don't worry about it), loosen the adjuster lock nut and pop the front drag link ball joint. Get the link out of the way. Turn the steering wheel 180º to one side or the other. Lying under the van, grab the drop arm with one hand and stick a screwdriver in the slotted adjuster screw with the other. Waggle the drop arm back and forth slightly. You should hear it "click-click-click" due to free play. Turn the adjuster in slowly until the clicking suddenly stops. That's it. Free play removed with the box just out of the preload position. Tighten up the lock nut without moving the adjuster screw (actually easier said than done...). To be avoided: if you adjust free play with the box in the centred position, you'll just introduce even more play when it's in use. If you adjust the box when the wheels are toward full lock, the box will likely bind when you're driving around straight-ahead, and you'll head off into the nearest hedge. Once properly adjusted, centre the box again, take the steering wheel off and stick it back on in the straight-ahead position. That's the box and wheel done. You've now got to make sure that the front wheels are actually pointing straight ahead with the box centred. You do this using the adjuster on the drag link. As the link gets slightly longer or shorter, it will move the wheels accordingly. Best way to do this in my experience is to set it by eye, more or less, then go for a drive. It's hard to judge unless you're moving, and you may need to drive a bit, stop, centre the box (have a grope for your pointer under the van), pop the balljoint off and tweak the length. A right pain, but you do get there eventually. Probably best to get the tracking checked once you've set everything up. That's it. Worth doing, IMHO. Bay steering is nowhere near as dire as folk make out. If it's set up properly, it's just fine.