Rover 620ti Gearbox problem

[FONT=tahoma]Hi, i own a 1997 Rover ti, its done 130k but is as sweet as a nut, apart from the gearbox! the gearbox itself works fine, goes into gears, no poppin out of gears, but its like stirring a pudding! even when its in gear it has masses of movment! ive replaced the gear link bushes but to no avail, im looking to sell it next year so want it sorted as i know it will put people of even though it goes in gears and drives fine.
Anyone else have this problem, or had it and sorted it?
Any help would be greatly appreicated!
Regards,
Emma........... MERRY CHRISTMAS!!!