Gear stick stuck in reverse gearstick loose and cannot select any other gears

This sounds like a gear linkage problem. Lift the cover around the gearstick. Check the ball joint on the gearstick. It should be a tight fit.
Is the gear stick loose in those problem gear positions or does it refuse to go into position for that gear?
Open the bonnet and check the connections at the engine end to make sure nothing is slack or loose. If you can Safely get under the car, check the connections at the gear stick end as well. If everything is tight the problem is probably inside the gearbox.

Gear selector is broken.

replace nylon bush at base of gearstick

Sounds to me that your cable is broke therefor not putting the car in gear. This can happen real easy. Have someone move the shifter for you and look at the side of your trans and see it the cable is moving. If not then you can do a visible inspection of it and see if it is broke.

Maybe, maybe not, lift the gearstick boot, look in press the cluts & try 2 move the stick (don't start engine), or behind the gear box check the levers, if is not, then.... your box needs 2 open.

Hi,
Fiats do not enjoy a sound reputation for their transmissions. If you are confident in your skills, remove the cover / boot that surrounds the gear stick. and check it carefully for fitting into the housing. There may be a plastic of fibre cup that the ball of the gear stick rides in. depending on the locating device for this "bearing" will affect the movement of the gear stick. If you can lift the gearstick and it shows lots of slop, then the 'bushing is no longer holding the gearstick in the correct neutral position which enables each gear, including reverse, to be selected easily. The reason for the 'bushing' failing will have to be ascertained, it may be a simple fix, or it may be lots of aggravation, depending if the parts are all present and can be salvaged.

Good luck.

Gearstick,gearstick linkage,or clutch good look I hope this helps (Rate me answer please)

hmmm ,got me thinking this one?? and only think i can think of is the micro switches on the gearstick ,on the on the citreon convertaseaur they were at the bottom of the gear stick under the rubber boot

Could be loose cables and out of adjustment or the syncros in the trans about had it.

If it's a later model (post 98), then I have an idea what's happened. On the rounded ball end of the gear stick that goes in the box, there is meant to be a plastic bush that is only a very loose fit on the end of the stick. If it has dropped while either removing or replacing the gearstick, and fallen into the area at the back of where the gearstick actuates the shift rail, then apart from having a very sloppy gearstick, you won't be able to move the shift rail backwards - which is what happens when you move the gearstick forward (1st,3rd,5th). This should be fixable from in the cab. Of course, if you have an earlier model, none of the above applies, as you have the gearstick moving only one of a choice of three shift rails with no bush in that area. The only thing that happens to those is the spring on the gearstick breaks (that can't be replaced on its own!)