Originally Posted by Mike D

Do a "search" on the board for information.

http://www.peachparts.com/shopforum/vintage-mercedes-forum/397744-m110-engine-identification-my-74-w114-sedan.html

Post #10

As GRZPDLR notes, the 2,88 will be the "lowest" ratio which will swap into your existing differential housing (185 MM). You already should have the 3,07 so I doubt you would see much improvement.

Numerically a 5% improvement but some of that will be lost in a lower efficiency at lesser rpms. Kind of a trade-off and it all depends on percentage of highway speed vs. in town use.