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What year is it? Reg number?
Renault Boxer?? You mean a Peugeot Boxer
Does this problem effect any other gears?
Does this problem only happen when the cold or upto running temp or both?
Well Peugeot boxer , Citreon relay all use the same boxes..the boxes arent uncommon for problems especailly around that model and years upto the the next version of relay vans..and most due to the syncro ring at fault in which you need to buy the complete 1st,2nd hub..is gearbox strip job so..if you did go down that road of refurbishing the gearbox..you need to go the full hog and replace everything while your at it..expensive considering 99% of the parts would need to come from Citreon,Peugeot itself..they likely wont sell the complete gearbox now. but they will still sell the parts...My advise...well as standard practise checks wise goes..ensure the gear selector cables arent becoming an issue..especially so over age they do tend to stretch..and thus cause gear selection difficulty..normally its the cables ends,bushings that go first..so maybe have these checked..Next gearbox oil..has that ever been changed since 1999? if not then maybe look at see if that can help and full fluid change on the box..and then inspect the old oil for any signs of internal wear ie:- swarf,glitter metal filings..as that normally suggests the gearbox is wearing internally maybe that syncro going..other than that i think your cheapest option based on the age of the van and you intending to keep it for a while yet would be to seek out a secondhand gearbox..if quotes to rebuild the current gearbox outweights "which it probably will" the cost of fitting in another box,clutch kit ontop..