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08-05-2008, 12:07 PM
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#1 |
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Registered User
Join Date: Jul 2005
Location: AL
Posts: 1,828
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tranny problem
i have a 2000 GMC 1/2 ton truck with auto overdrive..
the problem i am having is... at cruise speed the transmission will shift up and down... doesnt seem to be slipping... but maybe the lockup is going in and out.... anyone here have any ideas.... plz thanks Rich
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08-05-2008, 08:36 PM
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#2 |
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Active Member
Join Date: Sep 2005
Location: North Hudson NY
Posts: 221
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Re: tranny problem
sounds like a pressure control solenoid
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08-05-2008, 08:49 PM
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#3 |
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Manual Transmission Club
 
Join Date: May 2008
Location: Grand Junction CO
Posts: 292
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Re: tranny problem
Sounds like auto's suck.
Sorry that was mean.
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79 GMC Sierra Grande, SWB, Heavy Half If I wanted easy I would just buy a NEW truck! |
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08-12-2008, 10:22 AM
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#4 |
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Registered User
Join Date: Feb 2007
Location: Memphis MI
Posts: 1,851
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Re: tranny problem
Hold the truck at 55mph, gently push the brake (just enough to turn on the lights but not enough to actually apply brake). That will kick off the converter, note the tach reading, let off the brake, the tach should drop 3-400 rpm. that's the TCC engaging. If it doeen't, that's bad, next you'll need a scanner to determine if it's getting the signal, if it is, then it's the solenoid in the trans or a trans/converter problem.
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1987 2 ton  1982 250/TH350 beater in progressDad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrappingPlus a mess o' tractors |
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08-12-2008, 08:28 PM
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#5 | |
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Senior Member
Join Date: Aug 2004
Location: Everett, WA
Posts: 2,316
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Re: tranny problem
Quote:
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2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold) |
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08-26-2008, 09:38 PM
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#6 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: tranny problem
all of these 99 to date are fully electronic.
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09-03-2008, 11:31 AM
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#7 |
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Registered User
Join Date: Feb 2007
Location: Memphis MI
Posts: 1,851
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Re: tranny problem
They all work the same. Brake shuts off TCC. ECM/PCM commands it on.
Only odd one are early units, particularly diesels, where the TCC may be hard wired to 3th gear or thru governer pressure.
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1987 2 ton 1982 250/TH350 beater in progressDad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrappingPlus a mess o' tractors |
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