I’ve read with some disbelief that these boxes can’t be at least partially repaired. According to the manual a seal replacement and cross shaft adjustment is all that can be performed and preload on the worm can be measured but not adjusted. Boxes for LHD’s won’t fit RHD’s because they are mirror opposites and good second hand boxes are scarce. Some have said certain recon boxes were available but were crap (wearing fast and leaking oil) and very expensive. I’ve repaired more steering boxes than I can remember in my working life and now that I’m retired and have a late bay to restore to stop me going senile (although I think I’ll be a dribbling mad man by the time I’ve finished it), I thought I’d take up an obvious challenge and find out why these things can’t be repaired. The box in my bay wasn’t totally shot but wasn’t that good either. The adjustment on the cross shaft was down too far and there was plenty of back lash. It had oil in it but you can see from the picture that it wasn’t good and there wasn’t a lot of it. I’ve put in a fair effort to repair the beam (another thread, a big thankyou to the people who showed me where to source the inner bushes) and putting in a less than serviceable steering box would not do it justice. Anyway I was successful in repairing the steering box and in doing so found some interesting practices by ZF in there manufacture that do not make repairing them a walk in the park. I have documented the process that I used and intend to post it here. If you are interested read on, if not thanks for reading this far.