A/T - AOD No Manual Low Gear

TSB 89-13 (Apr)

SUBJECT: FORD AOD

NO MANUAL LOW




Some AOD's may not have manual low because of the valve body layout. If the shift selector reads P-R-N-OD-3-1, the transmission should have a one-piece 1-2 shift valve in it (See Figure 1). This unit should give you manual low.




If the selector reads P-R-N-OD-3-2 , the unit should have a 1-2 shift valve in it (See Figure 2). This transmission will not have manual low. The transmissions with no manual low were usually found in police cars, but may also be found in other vehicles.

If the transmission has ever been worked on, you can't be sure which style you have -- without removing and examining the valve body.

The figures show two different valve trains for the 1-2 shift valve. To get manual low, you must have the one-piece shift valve.

If you run into a valve body that has a two-piece 1-2 shift valve -- this valve body can not provide manual low.

If you want manual low, but you have a two-piece shift valve, you must change the valve body, not just the valve.