the 260E and 300E had different rear end ratios. as did the 200E and 230E. as did all variants of the diesel cars, and the v8s.
coupes and tourings also had lower (higher numerically) ratios than sedans. want a drag car rear end? get the one from a 200TD or some such. might not handle a lot of power though, but on paper it should be the best for such an endevour.
the only commonality i know is when they switched to the 104 engine all the 6s used the same rear end ratio, same as the 300E. by that time mercedes was simplifying thier parts in response to the shellacking they were getting from lexus. of course the 104 engine was more flexible than the 103 with its variable intake, variable valve timing, coil on plug etc etc etc
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