V6-V8 4.6L SOHC V8 Rebuild - Ford Mustang Forum
 
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post #1 of 6 (permalink) Old 01-04-2019 Thread Starter
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Question V6-V8 4.6L SOHC V8 Rebuild

A buddy of mine recently offered me his used 4.6L SOHC V8 and Manual Transmission. I want to put it in my 2004 Automatic V6. I'm just looking for a little help getting a list together of what all I need to buy. I was also told that I would need to rebuild the engine and change the gears in the rear end to prevent the new power from damaging the rear end. If anyone could help me out I would really appreciate it.
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post #2 of 6 (permalink) Old 01-04-2019
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A buddy of mine recently offered me his used 4.6L SOHC V8 and Manual Transmission. I want to put it in my 2004 Automatic V6. I'm just looking for a little help getting a list together of what all I need to buy. I was also told that I would need to rebuild the engine and change the gears in the rear end to prevent the new power from damaging the rear end. If anyone could help me out I would really appreciate it.
Thanks!
You were not told quite enough. To my knowledge, the V-6 uses the same rear end as the V-8, if I'm wrong on that, someone will tell me please? Going to a manual from automatic will necessitate changing the rear gear RATIO, if it is quite low numerically, below 3:1.

All of the electronics will need to be changed. If the instrument panel is of the design where it is self-contained, it must have a similarly programmed computer, PCM, to the old one, but for a V-8. Don't even know if that's possible. The money spent to successfully make the change you would like would likely amount to the cost of another '04 equipped with the V-8.

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post #3 of 6 (permalink) Old 01-05-2019 Thread Starter
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Well for 1 grand to get the motor, transmission, and exhaust thats not bad at all. (Hes giving me the stock ECU and i have already planned to get the instrument panel from a car that got rear ended a while back.) What I'm looking for is anything that you might know of that I could forget.
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post #4 of 6 (permalink) Old 01-05-2019
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Everything.Get a whole donor car.You will have to change all wiring harness-including key assembly,instrument cluster with ecm (pats).I have done this swap.Gutted my V6 and put everything,including rear end,from the GT.


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post #5 of 6 (permalink) Old 01-05-2019
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Originally Posted by ChanceP View Post
Well for 1 grand to get the motor, transmission, and exhaust thats not bad at all. (Hes giving me the stock ECU and i have already planned to get the instrument panel from a car that got rear ended a while back.) What I'm looking for is anything that you might know of that I could forget.

Not if they need rebuilding, unless you know its history you could be putting in a less than acceptable motor/trans., can you imagine how you would feel then? If you have a DD and just need a project and money and time are not important then I would go ahead.
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post #6 of 6 (permalink) Old 01-09-2019
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Most V6 cars use a smaller rear end. I believe it is a 7.75 rear as the GT cars use the 8.8 rear.

2003 Mustang GT Convertible 5 speed - Mostly stock 4.6... 455 rwhp and 573 ft/lbs torque. (SOLD due to divorce)

Currently working on Coyote Swap of a 2004 GT
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