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09-01-2006, 12:19 AM
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#1 |
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Registered User
Join Date: Jun 2006
Location: N.P, Nebraska
Posts: 32
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Tranny won't shift!!!
I'm having troubles with my tranny not wanting to shift out of 1st gear unless motor is reved up pretty high. Is there a way to adjust the vaccum modulator? What is proper vaccum pressure I need? Any suggestions?
I replaced filter and tranny fluid. Please help, my wife keeps saying ( I told you not to buy that TRUCK!!! ) 
__________________
 1967 Chevy Stepside Shortbox 1995 Chevy Silverado 4X4  1956 Chevy 210 post Delray
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09-01-2006, 12:21 AM
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#2 |
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Registered User
Join Date: Apr 2006
Location: southern Il
Posts: 335
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Re: Tranny won't shift!!!
torqe convertor
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09-01-2006, 12:24 AM
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#3 |
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Registered User
Join Date: Jun 2006
Location: N.P, Nebraska
Posts: 32
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Re: Tranny won't shift!!!
???? do I need to have it flushed out?
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1967 Chevy Stepside Shortbox 1995 Chevy Silverado 4X4 1956 Chevy 210 post Delray
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09-01-2006, 12:26 AM
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#4 |
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67-72 parts finder
Join Date: Aug 2006
Location: southeast mo
Posts: 788
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Re: Tranny won't shift!!!
ever hear the rule not to change the filter and fluid if its not been serviced regularly???? if so this might fall in that category sounds to me like its time for a rebuild
__________________
  1969 chevy shortstep 2wd (under construction)1981 chevy scottsdale lwb 2wd (parts chaser) 2004 pontiac gto (daily driver) 2004 pontiac grand prix gt (the ol ladys car) 1985 chevy short wide 1970 chevy c10 lwb (another parts rig) 1969 gmc lwb (rainy day project) 1968 chevy lwb c10 250 I6 3 spd (soon to be swb) |
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09-01-2006, 01:26 AM
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#5 |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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Re: Tranny won't shift!!!
Try shifting manually. If it shifts fine, check your vacuum to your modulator. If not, then I can't help.
__________________
"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal.  We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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09-01-2006, 08:37 AM
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#6 |
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User #12137
 
Join Date: Apr 2004
Location: kingsport,upper east tenn
Posts: 11,598
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Re: Tranny won't shift!!!
sum vaccum modulators are adjustable yes, but not in stock form
if it has been changed to a after market one then yes its possible for example http://www.tciauto.com/tech_info/faq.htm#13 |
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09-01-2006, 02:07 PM
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#7 |
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Senior Member
Join Date: Jul 2006
Location: Blountville, Tn.
Posts: 3,904
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Re: Tranny won't shift!!!
I had this problem once before. My problem was the governor in the trans. tells the trans when to shift.It is located on the back under a cap that resmbles a grease dust cap. I replaced mine and it shifted fine. Maybe this will help you out.
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09-01-2006, 02:09 PM
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#8 |
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Senior Member
Join Date: Jul 2006
Location: Blountville, Tn.
Posts: 3,904
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Re: Tranny won't shift!!!
Oh mine was a TH350.
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09-01-2006, 02:12 PM
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#9 | |
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It's a catastrophic success.
Join Date: Jan 2003
Location: Oklahoma
Posts: 2,077
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Re: Tranny won't shift!!!
Quote:
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09-01-2006, 02:26 PM
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#10 |
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Senior Member
Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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Re: Tranny won't shift!!!
I think it's one of 2 things. If you have the kick down cable mis-adjusted it will act exactly like that. Two, it could be your vacuum modulator.
Good luck! B-dub |
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09-01-2006, 02:44 PM
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#11 |
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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 won't shift!!!
kick down is very unlikeoy...but possable.
I agree with a drive around the block and drive it like a stick, but rev it just a little more than it's normal shift point, then stab it into the next gear. If it shifts, then look at the vac line real close both on the engein to the hard line, and underneath at the modulator to the hardline. |
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09-01-2006, 11:37 PM
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#12 |
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Registered User
Join Date: Jun 2006
Location: N.P, Nebraska
Posts: 32
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Re: Tranny won't shift!!!
thanks for 411
__________________
1967 Chevy Stepside Shortbox 1995 Chevy Silverado 4X4 1956 Chevy 210 post Delray
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09-01-2006, 11:51 PM
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#13 |
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Msgt USAF Ret
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,717
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Re: Tranny won't shift!!!
Here is a website that explains how a tranny shifts. It is worth reading and makes sense to us non experts.
http://www.technicalevolution.com/hyd.htm
__________________
VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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09-02-2006, 09:58 AM
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#14 |
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Registered User
Join Date: Sep 2005
Location: Villa Rica Ga
Posts: 889
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Re: Tranny won't shift!!!
mine was doing this, checked the vac line it was loose and old, put on a new one shifted like a champ!!.. good luck
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09-03-2006, 05:33 AM
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#15 |
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Black 72 Chevy
Join Date: May 2002
Location: Los Angeles, California
Posts: 662
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Re: Tranny won't shift!!!
When my truck was doing this, I found the vacuum line had a hole. Replaced it and it worked great. Good luck.
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