I'm planning on putting a transmission from a '91 190e 2.6 into my '87 260e. This should work fine, correct? They're both the 722.4 from what I've read.
Will there be any difficulties because of the year difference, or anything else?

Where did you read that an 87 260E is a 722.4? I don't think that's right. It's on your transmission and the VMI.

260e's had the 722.4, 300e's had the 722.3. Plus I have the orig build sheet for my 260e and it lists the transmission as 722.4 (a vin check on the mercedes vin site also shows this)

our two 1989 w124's have transmissions 722.358 according to the build sheet

the 1988 260E has a 722.409 according to the build sheet

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1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]

What's the difference between a 722.3 and a 722.4?

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2012 E350
2006 Callaway SC560

Yes the transmission will fit/work. The difference between the .3 and .4 is size.
the .4 fits the 2.6 ltr. 103 engine and was made smaller and lighter since the engine developed less torque.
Mike