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07-07-2013, 02:54 PM
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#1 |
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Registered User
Join Date: Jun 2012
Location: Surrey, BC
Posts: 12
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1981 Silverado not switching into third gear.
Took a drive home from my ladies house this morning, and noticed trouble getting into third gear. It would rev louder and louder, if i let off the gas a bit and revved again, the truck would suddenly switch into third and pull forward quickly. After 2 times of that, I couldn't get the truck into third. Just revving loudly at 2nd gear.
When I first started the truck i heard a few loud bangs or clanking noises when in idle. Couldn't tell where it was coming from but sounded like it was from the rear end, maybe just the exhaust. Where to start to diagnose the problem? |
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07-07-2013, 03:18 PM
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#2 |
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Registered User
Join Date: Jun 2012
Location: Surrey, BC
Posts: 12
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Re: 1981 Silverado not switching into third gear.
Nevermind - Fixed. Sorry for useless thread. The vacuum line was unplugged from the transmission. I didn't know that's how it changed gears.
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07-07-2013, 03:18 PM
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#3 |
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Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: 1981 Silverado not switching into third gear.
Is this a th350 or 700r4?
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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07-07-2013, 03:23 PM
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#4 | |
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Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: 1981 Silverado not switching into third gear.
Quote:
Posted via Mobile Device
__________________
377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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07-07-2013, 05:07 PM
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#5 |
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Registered User
Join Date: Jun 2012
Location: Minnesota
Posts: 509
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Re: 1981 Silverado not switching into third gear.
Not exactly a kickdown, its a pressure regulator that uses engine vacuum to sense load. Governor pressure is applied to one side of the valves fighting for an up shift, modulator pressure is applied to the other side fighting for a down shift. This is obviously an over simplification but you get the idea. The kick down is a mechanical link that actuates a valve directly and forces a down shift at or near wot.
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