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I'll start with I've never pulled down a gearbox but am interested to try and learn.

The gearbox is OK and silent in all gears, the transfer case can always spin the fronts as well as the rears, but if you quickly put it into fifth at anything above about 80km/h, it'll crunch. It also won't go into fifth at over 140-150km/h, causing major suckage down the straights at Sandown.

Would anyone have a diagnosis?

Is pulling down a gearbox and checking/replacing synchro's and other parts a DIY job for someone who does practically all work on their car?

If so, what should I know?

If not, who should I take it to and what are the typical costs?

If not again, do R32 GTR gearboxes often break or not, therefore I should chance it with a second hand box?

Thanks

Yes that sounds exactly like the symptoms of the (common) worn synchros. No you are unlikely to have any better luck with another 2nd hand box because they all have 22 years of being abused just like yours :P

I recently had a second hand 32 box rebuilt, it cost about $2000. That cover upgrade to 33 series 3 parts (you cannot get 32 parts any more) including all new synchros. All new bearings. Strip, clean, measure and reassemble. From the guys at Award Gearboxes in Seven Hills, they have done heaps of GTR boxes.

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