only problem m8 is it's not just the seals that wear, the metal bits wear as well which you won't replace and you end up with the same problem a few months down the line
while thats true if you can get drop arm off they are fairly simple to remove both shafts and replace seals if in good condition were seal runs, not all recon boxes are fitted with new shafts well not if been sold for £120 i could give instruction if needed
Its an easy job with the drop arm off to replace the seals but just a little wear on the metal parts can have it loosing fluid.Done a few but wont do them again just put another box on do the job once do it right first time.
Mm 4x4, recon box 109 quid, 12 months warrenty, mibe came yesterday, fitting it tomorro, i ordered a drop arm aswel as they seize on, only 30 quid extra