hi i have a 90 elx 1600 8v with noise coming from gearbox may be the diff.only happens when you take foot of accelerator and de accelerate,any ideas?????i have cheked oil levels all ok.if it is the gearbox what gearbox fits it,ie does the one from a 75 or 60 or 55 work.many thanks

Hi welcome to the forum
i would change the oil before changing the box. should be done every 40.000 miles on a punto.
and you shouldn't realy be driving if you are only 13.

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if that doesnt work does it need a new gearbox!!!!!!!!!!!!!

i wouldn't fit a new box just because of a noise what until it breakes first.

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Heh, my gearbox broke last autumn. Final drive went, although its wasn't noisy beforehand - it just suddenly went, made lots of clonking noises and gave intermittent drive to the nearside wheel.
I fitted a complete 'box from a scrap car, but finally got round to dismantling my old one at the weekend. Basically, in the final drive there's the differantial, which has 2 small gears mounted on the crownwheel and these gears drive another 2 gears which are each connected to a driveshaft. The small ones mounted on the crownwheel were both knackered - 5 or 6teeth had been stripped off each one! (Found the teeth in the bottom of the casing [xx(])

Moral of the story? FIAT make sh*te differentials!