I own a very nice 850 csi but it has a poorly diff making a horid scrapping noise. 
Does anyone know if a diff from a different model 8 series would bolt straight on 
I was thinking specifically of the 850 ci.
Cheers,
Tony.
Bmw 850 csi with poorly diff
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all 8 series diff are the same. Various Ratios are used and this can be identified by a aluminum tag on the side bearing.
E34 and E38 use the same diff but witha different rear cover. Just use your own cover.
Changing ratios is a good way to imnprove acceleration times from 0 to 100
EG if you have a 2.9 ratio then a 3.6 will wake it right up. Top speed will drop and economy will drop but the car will accelarate.
Ratios available are 3.2, 3.4 & 3.6. sOME SOME 3.9'S ARE AVAILABLE BUT HEY ARE FAIRLY UNCOMMON AND PERAHPS A LITTLE HIGH FOR EVEYDAY DRIVING.
HOPE THIS HELPS
THEO HOFFS
PIECES FO EIGHT/
CLUB OF EIGHTS
MELBOURNE AUSTRALIA -
850 csi with poorly diff.
Many thanks Theo that really helps.
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Hy there, i've got a 850i with 3.91 from European E34 m5 5 speed. ACCELERATION IS VERY NICE, but first gear very short and top speed 235 km/h in red line (6400 tr*n-1, possible cause i've change the chips from EML and DME; Car very nervous, but it become " little tired" after severals miles on the motorway (cause of noise , i haven't catalitic exhausts)
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