Originally Posted by
subford
They were for a 1995 and they change a little from year to year but the 1990 is not close at all to them.
A 1990 does not have a PSOM.
If you have the E4OD then the speed information comes from the transmission/Xfer case to the PCM computer and then the computer controls the transmission.
If you have C6 then it is not controlled by the computer or the speed gear in the transmission/Xfer case.
A few years after the E4OD came out it no longer used the trans mounted sensor but got the speedo signal from the anti lock sensor in the rear end.
My 96 E350 has the 460 with the E4OD and no speedo sensor, just a plug in the hole.