• Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

99 GT - Engine build cobra crank, need help figuring out balancing!

  • Thread starter Thread starter sethgunn
  • Start date Start date Aug 18, 2018
S

sethgunn

New Member
Dec 4, 2012
8
0
2
Aug 18, 2018
#1
  • Aug 18, 2018
  • #1
Guys,

I've been building a 4.6 2v for a turbo for a while now. I'm well on my way now starting to get to the accessories part of the build. Basically I have a Windsor block from my 1999 Mustang Gt 2v, and I put in a forged crank (I was told it was an 03-04 cobra crank, I can tell it's forged, but apparently the 99-01 cobra cranks were also forged??).

Here is the problem though. With all the mixing of parts and year models I don't know if I need to very carefully choose my Harmonic Balancer and flywheel? I believe I read the 99-2000 mustangs were externally balanced and the 01-04 were internally balanced? Is this right?

So do I just really need to match the crank? it has an 8 bolt flange for the flywheel, maybe that'll help identify exactly which year. I'm just at a loss because there are so many possibilities to choose from and I don't want to crank it the first time and it blow up.

Thanks for any help
 

Neuron

5 Year Member
Nov 6, 2016
859
192
93
Aug 18, 2018
#2
  • Aug 18, 2018
  • #2
Unlike pushrod motors, you don't have various engine balances that you have to worry about. All of your mod motors, whether it's a 4.6, 5.4, or 5.0; they're all going to be a zero balance, meaning they're all internally balanced in the engine. On your pressure plate bolts, you do have to make sure that you get the right ones, because your 10-1/2 inch clutch uses a different set of pressure plate bolts than your 11 inch clutches. While I'm at it,just to throw another wrench in there, pretty much all of your pressure plates are going to be 6 bolt, up until 2011. In late 2011, Ford went to a nine bolt pressure plate that carried through to 2014

8 Bolt Flywheel

  • 96-98 Cobra
  • Some 1999, 2000, and early 2001 GTs
  • 99-01 Cobra
  • 03-04 Cobra
  • 03-04 Mach 1
  • 07-14 GT500
  • 11-14 GT
  • Note: All Cobra cranks are forged. Mach1 stick forged.
 

wmburns

SN Certified Technician
Aug 14, 2009
5,892
514
204
Houston Texas
Aug 18, 2018
#3
  • Aug 18, 2018
  • #3
sethgunn said:
I read the 99-2000 mustangs were externally balanced and the 01-04 were internally balanced? Is this right?
Click to expand...
I believe there is confusion between the 4.6 V8 modular motor and the V6 OHV motor. The above is a true statement for the V6 motor.
 
S

sethgunn

New Member
Dec 4, 2012
8
0
2
Aug 19, 2018
#4
  • Aug 19, 2018
  • #4
I guess I never knew there was such a big difference for the V6 mustangs. So then all the 4.6 V8's were internally balanced? and then just the flywheel and the harmonic balancer should be neutral?
 
You must log in or register to reply here.

Similar threads

6
Hey all,I’m putting together a 302 for my 1968 Mustang and wanted to post the combo + some questions to make sure I’m not missing crucial
  • 68_Disgustang
  • Feb 22, 2026
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
4
Views
827
1965 - 1973 Classic Mustangs -General/Talk- Jun 20, 2026
gray owl
G
C
Please help 01 cobra swapped gt
  • Calabaza117
  • Dec 2, 2024
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
18
Views
1K
1996 - 2004 SN95 Mustang -General/Talk- Mar 16, 2026
Moelutenet
M
0
V6 to V8 Swap info
  • 02_2v_Curtis
  • Jan 11, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
0
Views
677
1996 - 2004 SN95 Mustang -General/Talk- Jan 11, 2026
02_2v_Curtis
0
SURGING IDLE / NO IDLE CHECKLIST FOR 1999–2004 MUSTANG GT (4.6L 2V) - Work In Progress
  • Noobz347
  • Aug 30, 2025
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
0
Views
875
1996 - 2004 SN95 Mustang -General/Talk- Aug 30, 2025
Noobz347
99/01 Cobra cluster in GT
  • Mustang5L5
  • Apr 4, 2024
  • SN95 4.6L Mustang Tech
Replies
13
Views
4K
SN95 4.6L Mustang Tech May 12, 2024
Mustang5L5
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?