RE: 66 c4 transmission breather ?
The tube probably is supposed to go to the vacuum modulator on the rear of the Trans. This uses manifold vacuum verses governorpressure to tell the Trans when to shift. There is also a case vent tubeon the drivers side above the shift linkage.
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Nightmist Blue 1966 Coupe.
FORD STROKERS 347. Holley 650. Edelbrock Air Gap Dual Plane. Twisted Wedge FAC190's TRI-Y headers & Glass packs. C-4 B&M Shift Kit, Kevlar Bands. Billet Servo. PowerTraX Auto Locker. 1 1/8" front 1" rear ADCO sway bars. KYB Gas-Adjust Shocks. Export brace and M/C bar. CSRP KH Disc Brake Conversion. Torq Thrust D's w/ B.F.G TA Radials.