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TC lockup

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Old Apr 1, 2010 | 08:55 PM
  #1  
skyhigh4by's Avatar
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From: Nanaimo BC Canada
Car: 2004 GMC 2500HD
Engine: Duramax LLY
Transmission: Allison
TC lockup

Ive asked this before but havnt had much luck with it. Anyways my question is what can I tie the TC vacuum line into to make the converter work properly? Right now the hose is just sitting there under the hood.

PS the vacuum canister has been removed along with the EFE system. Thanks.
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Old Apr 1, 2010 | 09:16 PM
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skirkland1980's Avatar
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: TC lockup

so you have the kit already?
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Old Apr 1, 2010 | 09:22 PM
  #3  
skyhigh4by's Avatar
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From: Nanaimo BC Canada
Car: 2004 GMC 2500HD
Engine: Duramax LLY
Transmission: Allison
Re: TC lockup

Sorry no I dont have a kit. Im talking about the stock line thats there. Its called the trans converter switch.https://www.thirdgen.org/forums/atta...1&d=1270174904
Attached Thumbnails TC lockup-vacuum-routing.gif  
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Old Apr 1, 2010 | 09:26 PM
  #4  
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: TC lockup

looks like it goes to full manifold vacuum
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Old Apr 1, 2010 | 10:20 PM
  #5  
skyhigh4by's Avatar
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From: Nanaimo BC Canada
Car: 2004 GMC 2500HD
Engine: Duramax LLY
Transmission: Allison
Re: TC lockup

Just get some "T" connections and tie it in to the hose from the EGR TVS to the EGR valve?

Ive barely driven the car at all so I dont know much about the way it drives but with the Trans switch unhooked what would be the expected characteristics?
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Old Apr 1, 2010 | 10:37 PM
  #6  
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
The torque converter clutch will never lock up.
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Old Jun 5, 2010 | 01:18 PM
  #7  
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From: Charlotte, NC
Car: 1990 Firebird Formula
Engine: 358
Transmission: 700-r4
Re: TC lockup

Originally Posted by five7kid
The torque converter clutch will never lock up.
Is that bad?
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Old Jun 5, 2010 | 05:45 PM
  #8  
camaronewbie's Avatar
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From: Cary, North Carolina
Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
Re: TC lockup

Tranny runs a little hotter at highway speeds, and mileage isn't as good.
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Old Jun 5, 2010 | 05:52 PM
  #9  
transam85dudeman's Avatar
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Joined: Mar 2006
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From: CALI
Car: 85' Trans Am !best car ever!
Engine: 305tpi 215hp LB9 two bolt,
Transmission: th-700r4
Axle/Gears: stock (3.27)
Re: TC lockup

Sometimes the torque converter locks up prematurely. Chirping tires and the "sound" the engine downshifting from high revs to low. MIne is above the break pedal and engages about 44 mph. Ive replace the switch once.
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Old Jun 5, 2010 | 06:32 PM
  #10  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Originally Posted by five7kid
The torque converter clutch will never lock up.
Originally Posted by oguin_studking
Is that bad?
Other than burning out the 3-4 clutch pack, no.
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Old Jun 5, 2010 | 09:17 PM
  #11  
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From: Tacoma, WA
Car: '91 Chevy 1500
Engine: 350
Transmission: 700R4
Axle/Gears: 3.73
Re: TC lockup

Isn't it hard on the converter also if you have a lockup that you don't lockup? I've heard that before.
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