well... after a day at the recyclers... and looking over 30 LSD 2,93 ratio, 20 lsd 3,73 ratio and about 3 lsd 4,10 ratio, I finally made up my mind.
By luck (I guess) I found a 1991 535i LSD 3,25 ratio. the back plate was different, but the rest of the diff was the same as those of an E30. I switched the plate, and ordered an M coupe plate as well, ($90 + $4 for gasket). brought it home, cleaned it up, painted it after 2 hours of sanding it, and it is now ready to be put on.
I took the cups off an E30 lsd, the axels and sensor.
I was unhappy with the high revs and low speed on the higway with the stock 3,45 open diff, so I figure I would HATE the 3,73 for my 3.2L M3 engine.
I had my mind set on a 2,93LSD, as I have plans of supercharging the car some time soon.
but I figure... my M3 has a 3,23 LSD, so I think the new 3,25 will be pretty close to a stock M3 ratio... and That I can live with.
for the new 3,25 diff AND AXELS in magnificent shape I paid $375. I think it is a pretty good deal.
what really amazed me, was the amount of 2,93LSD ALL OVER! so I will actually buy one to compare them when I have the carger... prob. $100 for the Diff.. 2,93 |