E30 Rear end question... Need some advice

[Clark954]

so im building my 318i with something a little odd in mind.
the M10 is gone along with the interior, seats, tranny... well just about everything, so as you imagine it weighs about 2 lbs

Im putting in a JDM 13b Turbo II motor in it, ill be messing around with the boost, fuel and other things to get the HP we are thinking about (roughly 400ish maybe a little more)

my question is I know the POS rearend thats there now is not guna last, but what do yall think i should go with, I would prefer something that bolts right in from another BMW but I deff want a LSD

so someone please guide me, learn me, school me whatever it is you wise BMW gods do

[atmobenzin]

Any medium case diff, if in good condition, is going to last pretty long, its not an audi you know.

[Clark954]

sweet so a 5 series will do just fine i guess, looks like im going to the junk yard

[Adrian_Visser]

Not so fast. "Any" medium case will not work. E30 or E28 ones (with the output flanges swapped if it isn't a 528e) are the only ones that will work. You can swap 188mm ring/pinion combos from e36 diffs. into e30 cases though if you need more ratio options.

[Massimo]

I know a local guy with a 13b swap E30 shit is insane. Other then that the E30 rear end is actaully very strong don't know where you get POS from it is more likely to brake a CV then a diff with that power.