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Discussion Starter #1
My son has two 94 Cougars. One is wrecked and it has a 4.6L I think. The good one has a 3.8L V6 which I just did a headgasket on and now have water leaking from behind the timing cover and also into the oil. Can anyone tell me if I can put the V8 into the V6 car without having to use the Transmission from the V8 car. Both cars are automatics and have multi port injection. Also, will I need to use the flywheel and torque converter from the V8 car, or the one from the V6 car. Thanks in advance for any help. From reading some of the other people's posts, it sounds like my timing cover leakage might be coming from water pump bolts that go through the timing cover. I was thinking that there might be some freeze plugs behind the timing cover or something. I will probably go ahead and tear off the timing cover, but am thinking of trading my son out of these two cars, and was curious how hard it would be to put the V8 into the V6 car.
 

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The Parts Guy
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7,360 Posts
Swapping the 4.6L into the 3.8L car can be done, but it requires a fair amount of work. You will have to use the 4R70W transmission from the 4.6L car, as the bellhousing bolt patterns are different between the SBF (3.8/4.2/5.0/351) pattern and the modular (4.6/5.4) pattern.

You'll also have to swap the EEC, EEC harness, engine harness, etc, etc.

It would be highly recommended to swap the rear diff and halfshafts from the 4.6L car into the 3.8L car as well.

You have all the parts there to do the swap (complete donor car), it's just a matter of whether or not it is worth the trouble to you.

-Rod
 

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Who is John Galt?
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6,476 Posts
If you want to swap over to the V8, you'll need quite a few things:
Engine
Wiring harness
suspension
rear end
halfshafts
It would probably be easier to swap the transmission as well too.

I know there are a probably a few more things. Have you thought about swapping the pieces from the 3.8 car to fix the 4.6 ones?

Basically, it is a lot of work to swap over to a V8.
 

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Full Metal
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4,744 Posts
how bad is the damage to the 4.6 car? it would be easier just to swap all the good body parts from the v6 car to the v8 car if the damage is just cosmetic, it's way easier to swap exterior parts than it is to swap the complete running gear and re-wiring.
 

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Discussion Starter #5
Sorry for taking so long to get back. The v8 car is wrecked, radiator into the engine and also has been rearended, so using that body is no good. The trans from it slips also, so I guess I'm just going to have to fix that timing case leak for now, and get a good tranny for the v8, or rebuild that one. If I'm going to use the v8, it will have to be a rebuild and hi-perf project, which means I'm going to have to get a garage built one of these days. Thanks for your help and information. If I do trade my son out of these cars, you'll probably hear from me more in the future. I had a 67 XR7 in 1977 when I was 18 and really love these cars.
 

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Full Metal
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well if the v8 is that bad do the drivetrain swap that way you won't get stuck with a salvage title on the car if it was totaled,
 
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