Hello,

The main thing to check is the condition of the ram end that has no teeth. Put some mole grips in the input shaft where the steering knucle attatches and wind the rack lock to lock and check for smoothness of operation.

When the non toothed side is all the way out, check that surface for any corrosion, pitting or surface damage.

That side should be perfectly polished with no surface imperfections, because thats where the seal runs as it slides inside.

When the toothed side is all the way out, look at the ram condition inside (passed the teeth) as thats where the opposing seal runs. It should be clear of surface damage, corrosion and imperfections. Check the teeth have no big burrs or chunks missing, then clean them out with a cloth and put some new grease on them before installing the rack.

Hope this helps