I have a FEB 2000 100series Landcruiser with a confused gearbox!!! The box wants to sift between gears, E.G. if in 2nd will change down to 1st and back to 2nd. if in 4th will change down to 3rd and back to 4th 3rd 4th 3rd 4th 3rd 4th. it does this intermitadley and through all gears but not if accelerating or doing over 2200 rev

gear boxes are supposed to change from 1st to second.
that is the nature of transmissions in that they change gear ratios as required by you or the transmission control module
so you will have to post again stating the reason you had to consider the transmission changes or the symptoms displayed in the fault codes that required the changes

Check engine mounts gearbox mounts when they brake it can make the car jerk and shutter because to much movement puts everything out

problems with a clutch system will result in grating first gear or reverse gear as the input shaft is still being turned by the engine. 2nd gear is syncro operated so any mismatching of gear speeds will be overcome by the syncro ring of the gears. By double de clutching you state that the problem is eased somewhat and this indicates that the gear box is at fault ( shaft bearings, syncro rings, gear teeth ) hard movement of the gear lever would indicate failed gear cable ,linkage or gear lever pivot problems. What you describe is a gear box fault. I would take it back and tell them to fix it or exchange it . Keep all records of conversations and dealings as you may have to get legal help to have the shop full their warranty agreement. Time to remove ,repair and replace a gear box would not exceed 12 hours in an accredited shop

While just change ATF oil or CVT oil in transmission & old filter too. your car problem will be solve....

sound like sincro gon in box u can get them recond at mr gearbox or cheeper 2 get sechand gear box

Bit of a long shot, but check the output of the throttle position sensor with a multimeter.

Also, check that the low range switch isn't continually reporting that you are in low range. The gearbox computer adopts a VERY harsh shift pattern in low range, holding gears until approx. 3500 RPM and even then producing very hard shifts.

Try unplugging the connector that carries the low range sense signal from the transfer box under the vehicle and see if that makes a difference.

is it an auto? if its a manual then its either your clutch, or gearbox does it make a crunching sound when going into gear? if it does then it's the clutch gone. careful driving it as you might damage the box

worn shift fork. shifts linkage could be binding.

Your link broke off. What might have happened is the car got stuck in 1st, and when you shifted to second, the link broke. Not too clued up on your car, but you probably need to drop the gearbox. On some cars you can take out the shifter without having to drop the box and still see if the link is broken. Good luck

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