Rear Axle - Limits Police Vehicle Top Speed

88ford23

AXLE - REAR - UNSATISFACTORY TOP SPEED PERFORMANCE IN SPECIAL SERVICE VEHICLES (POLICE)

Article No. 88-21-4

FORD: 1988 MUSTANG


ISSUE: Unsatisfactory top speed performance of 1988 Mustang special service vehicles (police) may be caused by the rear axle ratio. The standard 3.08:1 rear axle ratio offered in 1987 was replaced late in the model year with either an optional 2.73:1 or 3.27:1 axle ratio. The 3.27:1 rear axle ratio used in police vehicles equipped with AOD transmissions may limit top speed performance to an unsatisfactory level for their intended use.

ACTION: Install a new ring and pinion, pinion bearings and speedometer driven gear to convert the rear axle ratio to 2.73:1. This will improve top speed performance. Refer to the 1988 Car Shop Manual, Volume D, Section 15-06 for removal and installation instructions.

NOTE: THE SPEEDOMETER DRIVEN GEAR MUST ALSO BE REPLACED ALONG WITH THE RING AND PINION TO MAKE SURE THE SPEEDOMETER INDICATES ACCURATELY.

PART NUMBER PART NAME CLASS

E7AZ-4209-C Ring and Pinion B
C7AZ-4630-A Pinion Bearing AM
D0AZ-17271-B Gear-Speedometer Driven AM
E0AZ-19580-AA Hypoid Gear Lube B


OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Eligible Under Basic Warranty and Powertrain Coverage
OPERATION: 4209L6G
TIME: 2.3 Hrs.
DLR. CODING: Basic Part No. 4209
Condition Code: 38
SPECIAL
INSTRUCTIONS: PROGRAM CODE L6G MUST BE ENTERED INTO THE PROGRAM CODE BOX IN THE UPPER LEFT HAND CORNER OF THE 1863 WARRANTY CLAIM.
OASIS CODES: 5960, 630400