C4 auto

Mustang Australia

Author Topic: C4 auto  (Read 315 times)

Offline wilso

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  • Location: nsw
  • Name: Jason
  • Car: 1966 mustang 289
C4 auto
« on: July 18, 2021, 10:52:24 am »
1966 Mustang C4
Looking for some help with my C4. I just did a rebuild on my C4 and now it will not shift into 3 gear. It shifts 1 & 2 but not 3rd.
i replaced all the bands clutches and bushings and iron rings.The only thing i changed in the vale body was the gaskets.

Offline USA066

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  • Robbo
  • Location: Bunbury WA
  • Name: Colin
Re: C4 auto
« Reply #1 on: July 18, 2021, 10:55:12 am »
May be obvious, but are you moving the gear shifter to the correct position. Needs be in the 0 mark
2007 GT Convertible
2008 Bullitt
1966 Coupe

Offline Clubman7

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  • Location: Mornington Peninsula
  • Name: Brett
  • Car: 1966 C code coupe
Re: C4 auto
« Reply #2 on: July 18, 2021, 12:30:03 pm »
Only thing I can think of is if you removed the valve body.
Have a look at this.
https://www.youtube.com/watch?v=Jmdia6EJpGc

Offline GLENN 70

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Re: C4 auto
« Reply #3 on: July 18, 2021, 03:36:18 pm »
Check the line on the vacuum modulator. If you bring it up to a fair speed in 2 nd gear  then put it into 3rd / drive back off and see if it drops into 3rd . Is it changing quite hard into 2nd gear ?