Question about Ford Thunderbird
Let me give you some of the things you should inspect that could be the reason your tranny do not have 3-4 shift.
Check governor for valve sticking, damaged seal rings on the output shaft, scoring of the seal ring bore at the rear of the case, loose governor to ouput shaft retaining ring, loose governor counterweight on the output shaft.
Check valve body for incorrectly adjusted or missing throttle valve cable, sticking or binding overdrive servo regulator valve, 3-4 shift valve, 3-4 TV modulator valve or orifice control valve, warped valve body or case sealing surface, bolts tightened to proper specs. damage missing or incorrectly installed spacer plate or gaskets.
Check direct clutch for burned clutch plates, damaged or leaking piston seals, leaking piston check valve.
Check the direct clutch to output shaft seal rings fro damage or leakage.
Check the output shaft oil feed passages and cup lug for leakage.
Check TV cable for proper adjustment, binding or broken cable.
Other than this, the next step should be to perform an oil pressure test.
Posted on Aug 22, 2010
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Posted on Jan 02, 2017
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