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Old Nov 5, 2005 | 06:07 PM
  #1  
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AZMichael
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Unhappy Strange Transmission Issue

I had my 1979 F-150 4x4's transmission was rebuilt 2 years ago and it has started shifting abnornally. If I cap off the modulator, and vacuum line, I am able to start out in low and shift thru the gears without issue, at higher RPM's of course. With the modulator and vacuum line to the manifold reconnected, I have to raise the rpm's extremely high to get the transmission to engage in either D-L2-L1. Reverse works fine in either configuration.
Does this sound like a simple repair or am I looking at a transmission swap? Any suggestions are greatly appreciated.
 
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Old Nov 5, 2005 | 11:45 PM
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Mil1ion
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FTE has a drivetrain forum which includes transmissions.
 
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Old Nov 6, 2005 | 12:40 AM
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hotroddually
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i would change the modulator and see if that helps.its the simplest thing to start with any way.-billy
 
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Old Nov 6, 2005 | 12:44 AM
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hotroddually
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oh yeah,welcome to FTE!!! hope you find the help to solve your problems,from all the helpful folks here.i know ive learned some good stuff here just by reading others comments etc.-billy
 
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Old Nov 6, 2005 | 08:23 AM
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I did install a new Green Stripe Modulator but it didn't help. Thanks.
 
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Old Nov 6, 2005 | 08:32 AM
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Thanks for pointing me where I needed to post this thread.
 
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