You can use any ford 4.6 from a ford truck. You have a 4.6 from the windsor plant in that car. the 1999 mustang
Gts and the 2000Gts had blocks made in the windsor plant and they have 8 bolt mains that the flywheel bolts to and some other small differences. The 4.6 from the trucks share all of these characteristics, becaue the windsor plant is where they made all the truck engines.
The 4.6s from all of the other cars were made in the romeo plant and use 6 bolt mains, so you would have to get a different flywheel if you wanted to use one of those engines. The only PI 4.6 car engines that got made in the windsor plant are 99 and 00 mustang GT engines, the rest were put in trucks.
Your engine is a PI engine, and you are going to want to replace it with another PI engine. If you're a mustang owner, and dont know what PI is, you should not be doing this job yourself quite yet. But you're on the right track by coming here. There are some very knowledgeable guys on here and they love to help. If a guy called "scottydoesntknow" chips in on this thread, keep in mind that he knows quite a bit about these cars.
The crown vics and grand marquis got the PI heads in 2001 I think
Mustangs got them in 1999
Trucks got them... idk, maybe like 2001 or 2002. Not sure.
But dont buy a non PI engine for ur car. You will lose about 50 horsepower lol.
If you do this job yourself, pay 110% attention to the electrical. Nothing else on this car requires an ounce of skill to do, as long as you don't **** up the wiring somehow. And Ill give you a word from the wise: take the trans out with the engine at the same time on this car. Its a thousand times easier with this unibody car to do it that way. And dont put the engine&tranny back in without a brand new clutch and OEM throw out bearing, if you're talking manual car here.
I just did this project not long ago, like I said. and here is what I learned:
- You CAN put a 2003 crown vic engine in a 1999/2000 mustang GT 5 speed
- You CAN make the 8 bolt flywheel bolt to the 6 bolt mains
-> you can do that because the 8 bolt pattern is actually really similar to the 6 bolt
-> 6 of the holes are very close to lining up, drill them out a tad and it will work
-> Thats only excusable to do if you are a broke college kid and need it done asap
- If the PATS system gets pissed off for no apparent reason, it will turn the fuel pump off after it primes.
I just went through this engine replacement myself a couple months ago. I have the same car as you and I put a Romeo engine in instead of the original Windsor. Not a huge deal, but most people wouldn't have been as crafty as I was about it.