No clue, but I'd guess the cost of sending the shock back to the maker or someone that could valve them would be more expensive than buying a new set specific to the 240. Like I said you probably will be fine as the 140 rears I got are the same part # as the 240 rears I got in the same order. But without cross ref. whatever brand you have I wouldn't know, I'd expect the weight between models to be different but if it's enough to make a difference in the rear end I'm not sure. Hell worst case you'll have to buy the right shocks if the 140's are to soft.