rear end? im pretty sure its different unless thats just on the 96-98's

 

already have gt rear end. just lookin to do engine change from the current 3.8 to 4.6.

 

Wiring harness and computer.

 

ok so regardless of the 99-04 body style being gt or v6 originals, there is no difference? even in the engine bay? would the 4.6 drop rite in with no problems? tranny and exhaust aswell?

 

yea only thing that could b different is exhaust hangs but all u have to do is look under your car and look at the gt exhaust see where the hangers are

 

you might need a GT K-member, not 100% sure though.

 

You need a ton of things...

K member
motor mounts
motor
computer
full engine wiring
rear end
tranny (depends on engine year and auto or manual)
all the odds and ends such as bolts that might be missing, some AC work, its a big pain from what i hear

lemme find a link

 

it would possibly be cheaper to jsut buy a GT or something. a GT engine is going to cost you $500 or so, then your going to need all the harnesses, lines, more fuel, tranny, and driveshaft.

and if your going to have to pay for labor it is going to make it alot more.

 

it would possibly be cheaper to jsut buy a GT or something. a GT engine is going to cost you $500 or so, then your going to need all the harnesses, lines, more fuel, tranny, and driveshaft.


itll cost at least 1500 for a long block with under 50k, unless you know a really good theif

 

K member- It is believed that the K members are interchangable, this is true between 4cyl., 3.8L V6, and the 5.0L V8, but they are conciderably different on the 4.6L. I originally attempted to modify the K Member to work, but it is completely shaped wrong and DOES require hanging. Your old steering rack WILL bolt right up.

Engine, intake, fuel injector system A/C compressor, coil packs and wires, waterpunp, etc.- Well duh!

Computer- This might not be a requirement, you might get away with a chip, dunno. I had a GT comp, so in she went,

Engine harness- This will have to be changed out for obvious reasons.

Headers- I had to change headers beuase the ones that were on the motor (rown Vic police car) were too small in diameter and the flange hit the firewall.

Transmission- I had to change out transmissions bauase her AOD-E will NOT bolt onto a 4.6L. Thankfully, I had three 4R70Ws lying around. Standard (manual) transmissions should interchange though.

Transmission harness- The harness is the same between AOD-E and 4R70W, but the O2 sensor harnesses are different. You probably can modify your old harness to work though.

Which brings us to O2 sensors. I am not sure what the differences are, but the part numbers for the 3.8L and the 4.6L sensors are different, so I changed them out to be safe. Her old O2 sensors did screw right into the GT pipes though. Again, if using the old trans harness, you can reuse the O2s.

Brake booster- The Modular motors (even the 16 valve GT) will not clear the vacuum booster, so you will need to get a 1996+ GT hydroboost.

Brake booster to steering lines- The booster runs off the power steering pump, therefore you will need to get a set of 1996+ hydroboost and power steering rack lines.

Slight modification of the brake lines will be necessary, as the V6 lines go in from the side, the GT goes into the booster from the bottom.

Transmission tail piece- The ONLY reason why I had to swap these tailpieces out is because the Crown Vic has a larger diameter yoke, therefore the rear seal is too large, and for some reason I cannot get a rear trans seal for a 1996+ GT 4R70W transmission.

Exhaust- Includes intermediate pipe and mufflers.

Radiator- The hoses are in diferent places and are not the same size.

Overflow tank. To match the radiator.

Modification of the drive shaft- The old drive shaft will work, but you will need to either 1. have the shaft shortened approx. 1", or 2, cut off 1" off the yoke. The splines are the same from the V6 and the autos, but the motor pushes the trans. back slightly.

Motor mounts- They are not the same as the V6. I piked up a set of solid motor mounts for a GT for $49.00.

The dash wiring harness does NOT need to be removed for a 4.6L swap, but WILL need to be changed to swap out to a 5.0, as the pins are larger for the computer.

Starters- The starter is the same from a 3.8L to a 5.0, but are different for a 4.6L.

Alternator- Not the same as a 4.6, though 3.8 and 5.0 are the same.

A/C lines- As I stated above, the A/C ompressor is different, and the lines are too.

I have been asked this several times, and yes, fuel lines WILL bolt up the the GT rails. These do not need to be changed out.


http://www.moddedmustangs.com/forum...rums/v6-mustangs/29651-3-8l-4-6l-motor-swap-install-hope-can-help-some-1-a.html

 

to answer the K member question, V6's, and V8's 99-04 use different K members. the K members for GT's,a nd cobra's are the same, but the A arms are not.

 

the K member in the 94-98 V6 is almost the exact same as the 99-04 ... there are some small modifications for cat clearances but other wise its the exact same

 

If you do decide to do a swap and not trade up to a V8 car you may as well put in a 4v motor if you are already going to change everything anyway. You could look into a 5.4 swap since I think it would require buying everything you would need for either motor. I know some of the V6 guys can make some good power with superchargers and turbos but nothing can compare to the sound of a V8 mustang.

 

if you consider 150k miles perfect condition

 

yea for all that money u should buy a 96-98 v6 roller car for like 500 and throw your 99v6 motor in and get some bolt ons and it will run mid 14's then a hsot of nitrous and your high to mid 13's

 

your best bet is to find a wrecked gt or cobra to do a swap like that .. or sell your car and just buy one

 

thats the idea.. getting one from a wreckers. i already have a wrecker looking for 99-04 gts. he gave me a ruff estimate. he's talkin the engine, transmission, computer, harness, exhaust, basically the whole 9 for about 2 grand.

 

just get the whole car that way you have everything and won't miss anything.. also whatevers left part out so theres some money back from your swap then have a junk yard come pick your car up theres another $60 if not haul it to a scrap yard they will pay you money for the metal..

 

sounds like a good start, who is doing labor?

 

that mite be a good idea too.. just take the whole car off the wrecker, then resell the car after im done with it. it will depend on how much he wants for it, and that would depend on the condition of the car.