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Speedo unstable after 6k revs

  02 Clio 172
Right had a problem with a bent front n/s strut which i got fixed, but im noticing still that when full throttle around 6k revs the speedo jumps erraticaly upwards by 10/20/30mph. Ive read the speedo reads from the abs ring or from gearbox. I have 2002 ph2 172 so i think its the abs ring?

Ive been told by mechanic that there is a small amount of play in the gearbox diff. Also the front n/s must have taken a battering while the strut was bent.

Now could the abs ring be smashed up hence the strange speedo readings, or could the play in gearbox diff have an effect? thanks