At the gearbox end are little gears which can be replaced and may enable you to actually get your speedo (more) accurate if your rear axle was replaced since there are different ratios available. At the speedo end - no idea actually....Replacement is the only real solution, but you may find it doesn't make your speedo work because the rounded ends of the cable have worn the square holes in the speedo or gearbox too.
Are the square holes able to be replaced or are they part of the casting in the speedo and gearbox?
Thanks for the info kroehl...this thread reminded me I still have this problem with my GTV even after replacing the speedo and tacho cables. Looks like another couple of jobs on the to-do list for when I eventually get her back.At the gearbox end are little gears which can be replaced and may enable you to actually get your speedo (more) accurate if your rear axle was replaced since there are different ratios available. At the speedo end - no idea actually....
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@alfista: You CAN get the cable out of the gearbox but be advised that it is one PITA to get as far as that. Loosening the gearbox crossmember to allow the gearbox to drop somewhat, without letting the engine hit the firewall, makes things easier but not easy.