69MustangCoupe393cid

Ok this is driving me insane and I can't believe I can't find this answer. But I have a set of UDP off my 2000 GT. Does anyone know why they wont fit the 01-04? Was it a different WP pulley? For some reason I remember this being why but can't find the answer. Will any of the pulleys work on the 01-04?

1slow67

In 01 they swapped over to a different water pump.

69MustangCoupe393cid

Thought so. So will all the older pulleys work except the wp? What exactly changed? Bolt pattern or was it the offset? Basically what I need to know is if the alternator and crank pulley will work with a stock wp pulley on the 01 to 04 cars.

1slow67

Just the offset. I can't remember which had which, but one has a short water pump and the other has a long one. Other than that I don't believe there is a difference between the others.

03greyGT

Its just the water pump pulley like others have said....early pumps are long and newer pumps are short...

69MustangCoupe393cid

So all the other pullies will work as long as I keep the stock 01-04 wp pulley?