A/T - AXOD Shudder During 1st To 2nd Gear Upshift

90ford01

Article No. 90-1-12

^ TRANSAXLE - AXOD - DELAYED OR HARSH UPSHIFTS-SERVICE TIP

^ TRANSAXLE - AXOD - SHUDDER ON 1-2 UPSHIFT DURING MODERATE TO HEAVY THROTTLE - SERVICE TIP

Figure 1:

FORD: 1986-90 TAURUS

LINCOLN-MERCURY: 1986-90 SABLE 1988-90 CONTINENTAL


ISSUE: A "shudder" during a 1-2 upshift at moderate to heavy throttle will occur if the main oil pressure regulator isolator spring is not installed after cleaning the valve body. This is caused by fluctuations in line pressure at the time of the 1-2 upshift. The transmission will perform normally at light throttle openings.

ACTION: If service is required, make sure the main oil pressure regulator spring is installed during reassembly. The main oil pressure regulator bore has three springs, Figure 1. The springs are:

^ The main oil pressure regulator spring

^ The main regulator boost spring

^ The main regulator isolator spring.

NOTE: THE ISOLATOR SPRING IS YELLOW IN COLOR AND IS THE SMALLEST IN DIAMETER OF THE THREE SPRINGS.

Special attention should be paid to proper installation of the main oil pressure regulator spring retainer. The retainer is similar to the one used in the AOD valve body, but is installed in the opposite direction, Figure 1.

CAUTION: IF THE RETAINER IS INSTALLED BACKWARDS, IT WILL CAUSE HIGH LINE PRESSURE AND RELATED DELAYED AND HARSH UPSHIFTS.

OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 5200