Is it true

[ozonehostile]

Or you can try a 405td box as its sposed to be a good compromise between the Hdi and 306 Dtub box

an hdi box would defiantly be your best bet if you want good economy, ive always felt that for a big family car, i.e long distance motorway cruising etc, the 405 gear box could do with a much longer 5th, just seems to run out of puff a bit quick, always think it would be so much better with a really long 5th or a 6th gear. just a shame that 6 speed dervs didnt really exist until about 2003 so not much chance of getting a 6 speed derv box to fit an old xud