I have an 1986 GT Automatic and I'm looking for information on the rear brake shoes and drums. Seems like a simple issue but got somewhat complicated as these things sometimes do.
The car is a fairly low mileage (60K) original with the original 8.8" rear end and original finned drums. The drums are Ford logo D9ZC-1126-AA date stamped 86C7B which is right on the production date of the car. The brake shoes were replaced in the past with Raybestos units with inked on number BPI-4090-FE. It looks like the wheel cylinders were replaced when the shoes were replaced. One of the wheel cylinders leaked which prompted me to dive into the rear brakes. Cleaned everything and bought a new hardware kit but ran into problems getting the supposedly correct rear shoes.
Issue is:
Raybestos and other suppliers such as Delco list separate brake shoes for 1979-86 versus 1987-93. Motorcraft seems to list the same shoes for 1979-1993 but their information is hard to follow. I always thought that the shoes were the same from 1979 to 1993. I have a complete 1991 5.0L automatic 8.8" rear end I bought for a spare which has nice Raybestos brake shoes on it with good looking drums. Inked on the shoes is the same Raybestos number of BPI-4090-FE. This number seems to correlate with Raybestos part number 569PG for 1987-1993. 1979-1986 are listed as part number 474PG. My question is: are the shoes actually different and if so what is different. Backing plates? Shoe size? Shoe material? What else?
Also, Raybestos lists different drums for automatic cars for 1989-1991. Pictures seem to show that they are not finned like the standard trans and 1979-86 cars. Part number for standard trans is the same as for 1979-86. My spare 1991 automatic rear has what looks like replacement drums that are finned. Anyone know anything about rear drum differences?
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