hi there

I have 2 cars one is w124 300d and the other one is w126 500 sec coupe,
the 500 sec engine is dead , and I would like to swap my 300d *om606*
into 500 sec, but I m mostly concern about diff.ratio..?

in other words,could I just use mine from 300d *it is 2.65 I think* and
install it in 500 sec all along with existing and well operating 300d engine,automatic transmission and differential ?

additionally, is anyone knows actual weight of 1987 500 sec engine?

thanks a lot