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  Mustangsandmore Forum Archive
  '94 to '04 -- The SN95 Mustang
  Differences in the 3.8L vs. 3.9L V6

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Author Topic:   Differences in the 3.8L vs. 3.9L V6
hwyman3
Gearhead

Posts: 2592
From: Southern Maryland, USA
Registered: Jul 2004

posted 07-26-2005 01:24 PM     Click Here to See the Profile for hwyman3        Reply w/Quote
I was talking to someone the other day who just purchased a 2004 Mustang 6 cyl Vert. It has the 3.9L V-6 and they want to install dual exhaust on the car. parts are very limited for the 3.9. Does anyone know if exhaust systems for the 3.8 interchange with the 3.9?

------------------
Greg W.
MCA #52100
2002 Laser Red GT Coupe The Highwayman 3
1991 F-150 XLT 4x2 5.0 Ole Faithful
Southern Maryland Mustang Club
http://mustangsandmore.50megs.com/MembersPics/hwyman3.html

Scott G
Journeyman

Posts: 87
From: Chattanooga, TN USA
Registered: Mar 2003

posted 07-26-2005 08:17 PM     Click Here to See the Profile for Scott G        Reply w/Quote
Someone correct me if I am wrong, but I sure don't remember Ford ever using a 3.9L motor in anything, and definately not in a Mustang. The 3.8 V6 was put in the mustang in 94, and updated with a new intake and heads in 99. I don't think they did anything else to it after that as they went with a 4.0 V6 in 05. So, I think the person with the car was just misinformed and probably has the 3.8. Hope that helps.

Scott

hwyman3
Gearhead

Posts: 2592
From: Southern Maryland, USA
Registered: Jul 2004

posted 07-26-2005 09:16 PM     Click Here to See the Profile for hwyman3        Reply w/Quote
I did some checking, and for 2004 there are some 3.8 and 3.9 V-6s. Ford replaced the 3.8 mid-year. I thought it was odd too, but it checks out. I just can't find anything on what the differences are.

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Greg W.
MCA #52100
2002 Laser Red GT Coupe The Highwayman 3
1991 F-150 XLT 4x2 5.0 Ole Faithful
Southern Maryland Mustang Club
http://mustangsandmore.50megs.com/MembersPics/hwyman3.html

IIGood
Moderator

Posts: 3919
From: Arnold, MD, USA
Registered: Jun 99

posted 07-28-2005 11:36 PM     Click Here to See the Profile for IIGood        Reply w/Quote
Ford just did some weird mid-year switch on the '04 V6s for the 3.9...I think the stroke is a little longer, but the actual engine overall is the same otherwise. I do believe a dual exhaust setup for the 3.8 would bolt up to the 3.9.

------------------
Frank S.----MCA Member 40390
'03 Mustang GT coupe
'99 Mustang coupe
'77 Ghia--"II Good"

hwyman3
Gearhead

Posts: 2592
From: Southern Maryland, USA
Registered: Jul 2004

posted 07-29-2005 07:56 AM     Click Here to See the Profile for hwyman3        Reply w/Quote
That's what I thought too. I thought it was really weird in 2004, going from a 3.8 that they have used for what seems like forever to a 3.9 for half a year and then when the new one comes out going to the 4.0.

Thanks Frank and Scott!

------------------
Greg W.
MCA #52100
2002 Laser Red GT Coupe The Highwayman 3
1991 F-150 XLT 4x2 5.0 Ole Faithful
Southern Maryland Mustang Club
http://mustangsandmore.50megs.com/MembersPics/hwyman3.html

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