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W124 250D
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Discussion Starter #1 (Edited)
Hello! I've recently swapped my M104 2.8 for an OM602 2.5D and I would like to swap my differential as well. Does anybody know which diff will suit better for this engine, my transmission number is 270 04 02 722 429 0 3099158 so I'm not sure which gear ratio it has and currently I have a 3.46 diff . Any help will be much aprecciatd.
Thanks
 

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87 300D 5 speed
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5,514 Posts
Hello! I've recently swapped my M104 2.8 for an OM602 2.5D and I would like to swap my differential as well. Does anybody know which diff will suit better for this engine, my transmission number is 270 04 02 722 429 0 3099158 so I'm not sure which gear ratio it has. Any help will be much aprecciatd.
Thanks
That depends on what differential and transmission you have now.
 

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95" W124/ E220 MasterPiece and 01" W210/ E200 KOMPRESSER
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262 Posts
You got a 722.409 AT...and comes with a 3.46 Diff....And I think it is a good pair...esp, in the city drive condition.

And if you like to upgrade and try to find a direct bolt-on swap, try to find a 3.07 Diff (Gear Size at 210MM).
Because in my region, chaises like W124 E280 with 722.4 / W124 E320 with 722.3 mostly come with a 3.07 ratio differential.

If yours is not a bigger size Diff, but a standard one i.e. 185MM, you might consider to swap it with yours or locate other smaller ratios Diff with the same gear size 210MM DIFF (when your engine can give lots of torques now).

But before you do so, make sure to measure the sizes of the half axle flange and the rubber flex disc...
Cause flex discs have 2 diameter sizes...i.e. 90MM/100MM and two bolt sizes at the flange.
 

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1993 230 TE.1999 om 606 td. and 722.6 3.2L,clk w208 1987 Kit car with 260e running gear.
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733 Posts
Make sure whichever transmission you choose has a first gear start, you'll need it with the drop in power.
I did much the same conversion back in 2010, 2.3 petrol to 2.5 diesel in my wagon.
3.07 is ideal if you are doing a lot of highway miles, 3.29 for town/highway and 3.46 for town driving.
I found 3.46 on the highways to be revving way too high at 70mph.
 

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1993 230 TE.1999 om 606 td. and 722.6 3.2L,clk w208 1987 Kit car with 260e running gear.
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733 Posts
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