Something I noticed in the 85 is that the shift points noted on the speedo are 10 miles per hour higher than on the 81 and 84 SDs. Third is at 80 MPH.

Is this due to a different rear end?

I think this may be why the 85 does not seem to have the same pickup as the other cars (as well as the fact that it has that oxidizer that works as a pressure tank).

anyone know if in fact the rear ends are different or is this transmission differences?

BTW- after adjusting the boost pressure I now get 0-60 in about 13 seconds.

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique