Hello, I have a 1997 850ci 5 speed auto and plan on doing a differential swap here shortly. So far I can't decide whether i will go with the Large case 3.15lsd from the e32 750 or go shorter and get a 3.64.
Does anyone out there have a 3.64 on there 5 SPEED 850i? how is it?
I know the 3.15 will be a decent upgrade from the 2.81 so any input would be appreciated.
Thanks.
3.64 is really fun, not too horrible on the freeway but it depends what you like.
3 15 is not worth it. 3.45 is a happy medium.
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Sounds good thanks, i'm thinking of going with a 3.64 open cause they are so much cheaper than the LSD units. 8 series doesn't need to break traction ever...
I have an extra 364 from an E32 if your'e interested. Known good, car got wrecked in the front and has since been stripped. Located in MD.
This is the ZF 5HP30 (M73 Steptronic) and stock 2.81 differential. The y-axis is engine rpm and the x-axis is speed in km/h.
Gears E31 M73 2.81.png
With 3.15, 3.45, and 3.64 differentials:
Gears E31 M73 3.15.png
Gears E31 M73 3.45.png
Gears E31 M73 3.64.png
I calculated these with my tire size, I am running 255/45R17.
Thanks! very good info!
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