ML7 was the start, 4" in the rear.
Repasado 3" rear
ML7.3 is the lastest 4" rear
ML7.5 is a fully welded rear end with 5" in the rear [stiffer and lighter than the ML7.3]. There are now 2 versions; Matic for use with 5" front end and the Durance for use with 6" front end.
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