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Old May 22, 2007 | 06:24 PM
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bronco shift problems

one of the broncos i have will not shift while driving normally. It will only shift if you let off the gas completely. it downshifts fine but wont upshift until you let off. well, i decided to restore this bronco and took the transmissions out of this one and another that shifted fine. i was just going to swap the trannys until i saw that the one that wont shift was missing a piece. the transmission book i have calls it the band adjustment locknut and bolt. my question is will putting this in fix the problem i'm having? i have pics to help. any help is greatly appreciated.

btw, how do you insert pics?
 

Last edited by reecem13; May 22, 2007 at 06:26 PM.
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Old May 23, 2007 | 11:20 AM
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From: Bend,OR
sounds like the vacum modulator is bad
 
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Old May 23, 2007 | 11:37 AM
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its a new modulator, i thought that too, so i replaced it but it didn't help. the tranny book i have says you can adjust the modulator. would that help? if the adjustment screw isn't the cause, then what does it do? i know the tranny needs it.
 
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Old May 23, 2007 | 01:19 PM
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From: Bend,OR
i couldnt explain that either. have you checked the vacum line that runs down to the tranny
 
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Old May 23, 2007 | 06:02 PM
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yeah, it looks fine. so the modulator is the only thing it coud be?
 
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Old May 24, 2007 | 08:12 AM
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look in your haynes manual on how to adjust it
 
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Old Nov 17, 2007 | 12:41 AM
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From: victoria canada
I had a c6 that wouldn't shift up... it was the little vacuum line from the back of the vacuum christmas tree. Attached it and tie-wired it on...Fixed!
 
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Old Nov 17, 2007 | 06:39 AM
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the band in an auto is like a brake. without the adjuster nut it should go anywhere, atleast i wouldnt think. it applies friction to one of the gear sets.
 
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Old Nov 17, 2007 | 12:23 PM
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I would put a vacuum gauge on the line at the tranny to be sure you have vacuum, *and* would use a mityvac to apply vacuum to the modulator and see if it holds.

JMHO....

-Scott in Spokane
 
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