QUestion: Audi 5000 Transaxle

I have to find another complete 087 series 3speed transmission and differential for my last-of-the-5000s. I have bought very cheaply a very tidy car but the trans is very dead...
My option at this stage is to buy a breakeryard unit that will be given a freshen up, even a reconditioning and so my question is more about differentials than anything....
It need a serviceable diff though (see later) so, is it a good rough-check guide of the sate of a diff that by holding one output driveshaft and rotating the opposite side there shouldn't be lots of rotational movement?
The car i have, i could rotate the Lobro joints had about 50 degrees...that was a lot of slop for any diff.
Background: The car is actually badged a 1989 100 2.2 EE, 5 cylinder.I pulled the diff to pieces yesterday and discovered the crownwheel and pinion are history and lots of metal sludge in the bottom of the case.. The pinion carrier bearing into the auto trans end had grenaded so the auto trans MUST be smashed inside. The governor has lost most of its teeth too and its centrifugal weights had broken off. The ex-owner must have noticed the whine noises?
Sadly, the car itself is in lovely condition with a great interior. The ex-owner had installed a new battery and on the day he refuelled it ceased shifting up from 1st. He'd had services done but for some reason 'they' never picked up on the importance of diff oil levels and the ATF mixing failure thing....
Any advice appreciated.
Pete
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Pete, (JPF may chime in) From what I hear boneyard trannies will only prolong the inevitable - most of the cars in the wrecking yard are there _because_ the tranny has died. It's not like the body will rust out first, right? You might have success with a car that has been hit - the more intact ones I see usually have copious amounts of goo leaking from the autobox. Steve Sears 1987 Audi 5kTQ - manual 5sp 1980 Audi 5k - manual 5sp...beginning to see a pattern.... 1962 and '64 Auto Union DKW Junior deLuxes - manual 4 sp....on the column..... (SPAM Blocker NOTE: Remove SHOES to reply)

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