A/T - A4LD Valve Body and Filter Change
TSB 88-31 (July)SUBJECT: FORD A4LD
VALVE BODY & FILTER CHANGE
In 1986, Ford changed the design of the valve body and filter for the A4LD transmission. Filter "O" rings were also changed to improve the seal between filter and valve body.
Valve bodies can be visually identified/
Early valve bodies (1984-1985) have ribs going front to rear and side to side on the valve body, near the rear oil filter bore. Bolt hole bosses will protrude above support ribs and filter bore diameters will be smaller than late models.
Late model valve bodies have front to rear, side to side and also diagonal support ribs near the rear oil filter bore. Bolt hole bosses will be flush with support ribs and filter bore diameters will be larger than early models.
When the correct filter is installed on the valve body, you will not be able to see the shoulder on the filter.
With the wrong filter installed, the shoulder will not fit into the valve body bore.
4-wheel drive units: Be sure to use the deep filter with the deep oil pan.
Early A4LD Valve - Body Filter Bore Dimensions
^ Front bore dia. = 25.1 mm (.9881")
^ Front bore depth = 7.5 mm (.2952") from cast surface to finished surface
^ Front bore chamfer = 30°
^ Rear bore dia. = 18.9 mm (.7440")
^ Rear bore depth = 7.5 mm (.2952") from cast surface to finished surface
^ Rear bore chamfer = 30°
Late A4LD Valve - Body Filter Bore Dimensions
^ Front bore dia. = 27.4 mm (1.0787")
^ Front bore depth = 7.5 mm (.2952") from cast surface to finished surface
^ Front bore chamfer = 15°
^ Rear bore dia. = 21.2 mm (.8346")
^ Rear bore depth = 7.5 mm (.2952") from cast surface to finished surface
^ Rear bore chamfer = 15°
LATE FILTER
FILTER PART NUMBERS
2 WHEEL DRIVE 1986 E6TZ-7A098-B
4 WHEEL DRIVE 1986 E5TZ-7A098-A
FILTER O-RING NUMBERS
LATE 1986
LARGE 67Z-7A469-A
SMALL E6TZ-7A469-B
EARLY FILTER
FILTER PART NUMBERS
2 WHEEL DRIVE 1985 E5TZ-7A098-B
4 WHEEL DRIVE 1985 E56Z-7A098-A
FILTER O-RING NUMBERS
EARLY 1985
LARGE E5TZ-7A469-A
SMALL E5TZ-7A469-B