A/T - A4LD Bellhousing and Pump Interchange
DATE: 1996TECHNICAL BULLETIN # 337
TRANSMISSION: A4LD
SUBJECT: Bellhousing, pump interchange
APPLICATION: Ford-Lincoln Mercury
A4LD
Bellhousing, Pump Interchange
There are three design styles of the A4LD pump The first and second design (1985-87 and 1988-89) look similar to a C-3 pump (figure 1) In 1988, the pump bolts increased in diameter from six millimeters to eight millimeters The third design was introduced in 1990. In 1990 the rear turbine shaft support bushing was moved closer to the rear (figure 2).
Make sure the drainback hole is at least 5/16".
The bellhousing has three design styles. The first design was used for 1985-86 models (figure 3). The second design was used in 1987 (figure 4), and the third design was used from 1988-95 (figure 5). The details of change are listed with each illustration.
The drainback circuit is restricted as shown. This design should be modified to look like figure four. Also, the drainback hole should be enlarged to 1/4".
The drainback circuit was modified in 1987 as shown.
NOTE:
The drainback hole should be enlarged as mentioned in figure three.
The threaded bores were enlarged in 1988 (marked with an x).
NOTE:
The drainback hole should be enlarged as mentioned in figure three.
The chart shown in figure six shows the modifications that should be made based on the parts being used.
NOTE 1:
The 1988-95 pump plate will work on all models. The 1985-87 plate will only work on 1985-87 models due to the bolt size. It is not recommended to enlarge the holes in the 1985-87 plate to fit the 8 mm bolts.
NOTE 2:
Alignment is very critical and care should be used when assembling the bellhousing and pump assemblies. An alignment tool is required to do this (Ford tool number T74P-77103-X or equivalent). Never use an impact gun on assembly. The proper torque is 16-21 foot pounds.