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Hi fro uk this is a common problem on many cars not just hyundai and ita most common cause of synchro mesh failure on2nd and 3rd gear is believe or not a bad driving habit! it goes like this when you set off in 1st then cange up 2nd gear whilst accellerating holding gearstick? in back position then change up 3rd gear still holding gearstick! in a forward position then? when up to 4th gear we let go of gearstick?? now just by holding g/stick whilst in 2nd and 3rd the slightest pressure also brings the synchro ring into play whilst gear already selected! so inevitably the synchro ring wears away to extent that they no longer work properly so the gearbox is none synchromesh on 2nd 3rd gears and on occasions? on 5 speed box 4th gear can become a victim ? hope you understand ? just quietly observe some peoples habits with manual boxes? as for repairs?cost? this is not a difficult job to replace all synchro rings but box has to be stripped and assesed ? the cost could escalate? but if you want quick turnround? a matter of hours? a recon box with warranty? is other option ? BUT would not advise risking a 2nd hand box probably worse or same as ? whichever choice you take you can check clutch at same time if milage is high? now some good advice! personally this is not a dire problem just a niggleproblem which if you take time in changing gears you can o/come gritty gear change save money for now till it is more affordable ? if you know any old timers truck drivers ? these are the guys who will show you how to drive /change gears none synchro mesh before it was ever invented ? hope this helps daughter but practice on gears and rid of the bad driving habit so many do not realise they have will make her a better experienced!driver
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Sounds like the syncro may b damaged. Typically a clutch problem would be noticeable in all gears, especially shifting into reverse when vehicle is running but not moving. Try giving a 2 count for engine RPMs to drop before going into third to see if that helps. Won't fix anything but might cut the grinding sound. Till you can get the tranny fixed or replaced.
4th gear is not a gear as such but a coulping of the input and out put shafts to make a complete shaft
If there is a problem moving this coupling it indicates a syncro ring problem or spigot bearing failure in the end of the input shaft
either way it amounts to a gear box removal and pull down for repairs.
check the drain plug magnet for metal bits . If any the box has to come out 4.th gear is straight shaft connection and 5 gear connects from the cluster shaft up to the out put shaft . On either side is a rear main bearing and from your description if that bearing is failed then the 4th gear syncro will not align properly and the gear for 5th will be out of alignment so the syncro to work will not work
This transmission is electronically shifted via solenoids controlled by a computer, so you need to have that tested for fault codes that may be in memory.
if a manual gearbox then check the oil level in the gearbox ,it has to ba newer model because the old minis used the engine oil in the gearbox as it was all in one
Change gearbox oil, your car might not have had this performed in 15 years. If the problem is still there, then the 2nd syncro is worn. Replacement isn't as bad as it sounds, but would need a weekend and a few tools. Might even be worth fitting new gearbox if you prefer not to open the gbox, look in a breakers yard.
Try putting it in 2nd, then 1st, if that works, sounds like you clutch is bad or defective. 1st gear has no syncro to slow the gears down, 2nd, 3rd, 4th, 5th do.
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