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@GarethEvans-fx5nc Depending on your ratio some may be a little tighter where it meshes with the pinion or speedo drive, try rotating the diff with a small prybar. If that doesn't work it may be easier to slightly release the gear cluster to create some clearance

@Clacton_Flyer_491 it's a 1.3 diesel so the ratios are wider than the f13 petrol engines. Probably the cause then. I'll take the gear cluster out a touch. Cheers

@@usernotfound5562 which ratios are you currently using? And what revs are you in top gear at that speed?

@Clacton_Flyer_491 my car has f13 bone stock gearbox , dash doesn't show rpm revs but in internet it says 5 gear top speed max 5000 RPM

I'd need more information to make a recommendation, which car and engine is it fitted to as there are several f13 variants? Also if you follow the instructions in my video to find out which final drive you have fitted to your differential then we can work out the best next step for you