I don't know what the '87 190 2.5 had, as the adsit catalog did not list it. They did say the '87 190e has a 3.27, so mabee thats it, but it is possible they just don't have one available so they didn't list it. FWIW The Adsit catalog is free for asking and has lots of good info about parts interchangability, rearends etc. I can't see buying anything from them as their prices are very high. I would think a google search on both questions would have success, at least the ratio question.