A/T - AOD Governor Pressure Leaks

TSB 89-22 (July)

SUBJECT: FORD

SUBJECT: Governor pressure

# 1. There is a lot of information in the field concerning governor pressure leaks on the AOD. Low governor pressure can keep the transmission from making a 3-4 upshift.

The fix has been to tighten the governor counterweight to the output shaft by putting a piece of rubber under the drive ball.

Another fix has been to tighten the aluminum plugs in the valve body which seal governor oil.

These fixes have been working quite well when there is a loss of governor pressure.

# 2. We have received calls of 4-3 coastdown clunks and shudders when coming to a stop being caused from too much governor pressure. Often these complaints appear after correcting the low governor pressure.

CONCLUSION:

If governor pressure is low, we must fix the leaks! If governor pressure is normal, DO NOT TIGHTEN THE COUNTERWEIGHT!

The problem is that the AOD does not have a governor pressure port. If governor pressure is low enough to prevent a 3-4 upshift, it also will not allow a wide open throttle (WOT) 1-2 upshift.

SUMMARY:

When diagnosing a problem that you think may be low governor pressure, check for a 1-2 upshift at maximum throttle. If the upshift occurs, governor pressure is fine. Do not tighten the counterweight.