1966 Ford Mustang No 3rd Gear Shift

FORD MUSTANG
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TIML
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  • 19 POSTS
I have a 1966 mustang with a c4 auto transmission that I got from a salvage yard. It shifts into reverse and from first to second but not into third. Does anybody have an idea of what might be going on??

Thanks,
Tim
Feb 16, 2006 at 7:41 AM
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LOVESCARS
  • ✓Experienced Mechanic
  • 359 POSTS
has to be fluid flow but start with a modulator
Feb 17, 2006 at 10:45 AM
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LOVESCARS
  • ✓Experienced Mechanic
  • 359 POSTS
this may sound stupid but the trans you have is a 3 speed correct? c-4 came in both 2 and 3 speed
Feb 17, 2006 at 12:19 PM
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TIML
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the trans is a c4.i looked in my ford book .it says ford had 5 automatics in the 1960's.it has the 11 bolt pan and says the c4 is a 3 speed.they list a 2 speed but say it is a fm2 with 14 bolt pan.thanks for the reply.tim
Feb 18, 2006 at 1:58 AM
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Suggested Repair

Start by checking the vacuum modulator and transmission fluid flow, which the expert identified as the likely cause of no third-gear shift. The owner already confirmed this is a 3-speed C4 with an 11-bolt pan, not a 2-speed unit.

Conversation Summary

The owner of a 1966 Ford Mustang with a salvage-yard C4 automatic said it shifts into reverse and from first to second but will not shift into third. An expert said the problem has to be fluid flow and recommended starting with the modulator, while also asking whether the transmission was a 3-speed. The owner confirmed from a Ford reference that it is a 3-speed C4 with an 11-bolt pan, not the 2-speed FM2 with a 14-bolt pan.

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