• Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech

Vibrations... perhaps an easy answer?

  • Thread starter Thread starter mr_woodster
  • Start date Start date Apr 4, 2008

mr_woodster

Active Member
Jul 28, 2003
1,314
0
36
Riverside, CA
Apr 4, 2008
#1
  • Apr 4, 2008
  • #1
I did some searching and think I've found my problem.
I have some pretty serious vibrations in park (havent driven it much, Rest of the car is still a work in progress)

My setup is a 66 coupe with a 95 efi 5.0 in it.

the car originally was a 289, that was swapped to a 73' 302. I believe it still has the original C4 transmission/flexplate.

My question is, what weight flexplate do i need to have a proper balance while retaining the C4 trans? It has the proper year harmonic balancer for the year motor.

Thanks for your help, a quick search sure helped narrow this down !
 

Fast63

New Member
Sep 20, 2007
717
0
0
Apr 5, 2008
#2
  • Apr 5, 2008
  • #2
aahhhh, should be 50 oz. flexplate and 50 oz harmonic balancer for your 95 EFI engine. If you have the 50 oz balancer but a 28 oz flexplate, which would have come in the 66 289 and the 73 302, that is your vibration problem.
 
D

D.Hearne

New Member
Sep 29, 2000
11,730
6
0
south louisiana
Apr 5, 2008
#3
  • Apr 5, 2008
  • #3
You need a 157 tooth 50 oz/in flexplate. And the 50 oz balancer to match
 

mr_woodster

Active Member
Jul 28, 2003
1,314
0
36
Riverside, CA
Apr 5, 2008
#4
  • Apr 5, 2008
  • #4
Thanks guys, i will look for one of these 50oz flexplates, i believe that is my problem!
 
D

daddy oth

New Member
Mar 12, 2007
46
0
0
Apr 5, 2008
#5
  • Apr 5, 2008
  • #5
replaced your flexplate with a 50 oz. and problem solve
 
D

D.Hearne

New Member
Sep 29, 2000
11,730
6
0
south louisiana
Apr 5, 2008
#6
  • Apr 5, 2008
  • #6
Just don't bother looking in the junkyard for one. There was no stock application for this one. Aftermarket only item. B&M, Ford Racing and others sell this one.
 

BarnStang

Founding Member
Mar 2, 2001
1,260
3
39
Hagerstown, MD
Apr 5, 2008
#7
  • Apr 5, 2008
  • #7
Or you can have a reputable machine shop rebalance yours...emphisis on reputable. But check the cost first, it may be cheaper to just order a new one.
 
You must log in or register to reply here.

Similar threads

U
8 Years of Vibration leading to engine knock?
  • UpgradeXP
  • Apr 14, 2025
  • SN95 V6 Mustang Tech
Replies
3
Views
405
SN95 V6 Mustang Tech Apr 14, 2025
Noobz347
S
Drivetrain 8.8 Pinion and 302 rear main seal leaks after replacing. 93 5.0 with t-5
  • Steigy4827
  • Jun 23, 2025
  • Fox 5.0 Mustang Tech
Replies
10
Views
612
Fox 5.0 Mustang Tech Apr 1, 2026
Steigy4827
S
N
Vibration issue
  • Nicolaj
  • Apr 14, 2024
  • Classic Mustang Specific Tech
Replies
5
Views
1K
Classic Mustang Specific Tech Nov 8, 2024
AeroCoupe
Z
Progress Thread zeth194 - New Guy on the Block
  • zeth194
  • Mar 19, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
10
Views
436
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Apr 26, 2026
LILCBRA
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
3
Views
668
1965 - 1973 Classic Mustangs -General/Talk- Feb 28, 2026
Noobz347
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific 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?