1986F150Six Posted April 30, 2020 Share Posted April 30, 2020 You'll see that D9AZ 9C735-B was the servo used from 1980 through 1983. Then E4AZ 9C735-B was introduced in 1984 and used through 1987. And E73Z 9C735-A was introduced in 1988. However, I have handled all of them and can't tell them apart, so would bet they will interchange. https://www.ebay.com/itm/1-NOS-Ford-Cruise-speed-control-servo-vacuum-motor-D9AZ-9C735-B-1979-LTD-Grand-M/324144864139?epid=1839461887&hash=item4b788a1b8b:g:IZsAAOSw9fZeog0U:sc:USPSFirstClass!40475!US!-1 https://www.ebay.com/itm/84-85-EXP-NOS-FORD-E4AZ-9C735-B-SPEED-CONTROL-VACUUM-SERVO-ASSY/283735387667?hash=item420ff26e13:g:ZmwAAOSwIM9eFQEw https://www.ebay.com/itm/NOS-1988-89-FORD-MUSTANG-CRUISE-CONTROL-SERVO-5/162472965292?epid=1336941337&hash=item25d424b4ac:g:z2wAAOSwuLZY5iO- Link to comment Share on other sites More sharing options...
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