yep, you can fit any w201 or w124 diff in there. your best bet would be a 3.07 or 3.27 lsd though. forget about fuel economy, you want limited slip capability on your car

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Why?

- Peter.

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2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S

so you can take corners like madman

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I have found the 201's extremely reliable and economical. The 2.2's consistently return 40+ mpg, the 2.5 mid to high 30's. My mileage is 98% flatland highway driving at 63+/- mph. I generally will only hit 2-3 stop signs in a hundred miles and I am easy on the takeoff. Mileage suffers with a 50/50 mix of #1 & #2 fuel in the winter. PowerService adds 3-4 mpg in any weather. Red juice further improves mileage 2-4 mpg (not that I would use it), veg reduced the mileage on the 2.2 to high thirties.

Jim

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2005 C240 4matic wagon (daily driver)
87 190D - 225K (on loan)
85 190D - 312K (on loan)
2011 Subaru Legacy AWD (Wife's)

New to this...
Whats Red Juice?

Just filled again... similar use but added Powerservices Additive.
322 miles 9.8 gallons used.. so almost 33mpg...
Better!

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2009 Mercedes ML320 Bluetec

I believe he is referring to "off-road diesel", heavy fines if caught using it on the roads. Red dye is added to differentiate it from pump diesel.