If you have antifreeze leaking from what appears to be coming from the transmission bell housing, the leak is most likely (although possible) not at the rear of the engine.
There
COULD be a freeze plug at the back side of the engine between the engine and transmission leaking. However, on the 4.6L engines, it is most commonly caused by either a water pump, heater hose, or intake manifold leaking at the
FRONT of the engine.
Leaks in these areas will fill the area between the cylinder heads with coolant, which will run to the back of the engine and out the hole in the cylinder block that is located just above the transmission bell housing. This makes it
LOOK like the leak is in the rear.
To verify this condition use a flashlight to look under the intake manifold just past the alternator. Sometimes it is also very helpful to remove the serpentine belt and remove the alternator (very easy to do) to verify that this is the problem.
Take a hard look at the coolant cross-over pipe on the front of the intake manifold assembly. These are notorious for leaking on both sides and
VERY LIKELY to be leaking on the driver's side where the thermostat is located.
This problem is so common that an aftermarket company named
DORMAN has come up with an aftermarket replacement intake manifold to correct the problem. The
DORMAN part number for your vehicle is
Part Number: 615-175 It is available at many aftermarket parts suppliers including AutoZone, O'Reilly's, and Advance, for around $230 (USD). (See picture below)
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