Extremely unlikely. Probably more likely to be a driver error which has damaged the slot or just not inserting correctly.Jarviser said:Google Double de-clutching!
Last time I drove my dad's Land Rover back in the 60's you had to get the revs right because first and second had no synchro-mesh. Going from third to second needed this double-de-clutch technique. First to second just needed a bit of patience. I used to watch bus drivers through the school bus window doing it in the 50's and 60's, stopping in neutral for up to three seconds between gears on the way up, and d/declutching on the way down. Synchro cones are a brilliant invention but not trouble free and sometimes cannot overcome, say, a draggy clutch..
SkyBlue, If the problem is going from fourth to third than try the technique (shift from 4th to neutral, lift the clutch and blip the throttle then clutch down and change to third) If that fixes it then the synchro cones may be to blame - major box problem if it is.