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Old 10-03-2011, 11:14 AM
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2006 silverado trans problem

2006 silverado 5.3 i believe 4l60 trans. 4wd short bed reg cab. 28000 mi.

no check engine light. trans seems like it's slipping in and out of O.D. between 45 and 55 mph.
anyone got any ideas before i give my left arm to a shop?

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Last edited by 65bluess; 10-03-2011 at 11:34 AM.
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Old 10-03-2011, 01:23 PM
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Are you certain it's slipping in and out of overdrive and not lock-up. This is a vehicle that should really be driven with a scanner on it that is capable of watching data. When it occurs, you can watch both TCC command and 4TH gear command to make sure the computer isn't commanding it.

Frank
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Old 10-03-2011, 01:53 PM
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it could verry well be lockup, rpms are not fluctuating that much- 100ish rpm at best but i can definetly feel it in the seat of my pants. and i do have an autotap scanner that i'm pretty sure has shift data.
what is tcc?

thanks 65 blue ss

Last edited by 65bluess; 10-03-2011 at 02:08 PM.
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Old 10-03-2011, 02:56 PM
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- TCC-Torque-Converter-Clutch-Connection-Valve

gutcha
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Old 10-03-2011, 07:01 PM
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before you condemn the transmission, check the TCC command (Torque Converter Clutch) in a test drive. I've seen other issues with the vehicle cause the TCC to cycle through the computer.

Frank
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Old 10-07-2011, 01:17 PM
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hi Frank, first of all thank you for your input...
here's what i got with my scanner:

TCC PWM Duty Cycle - stays in the range of 95% to 96.9%. but within the 45 - 55 mph range TCC PWM fluctuates betwween 10 and 40% farly rapidly, say 1 to 2 times every 5-10 seconds. this data does not change weather there's a load on the drive train, up hill, down hill or on level grade.

TCC Apply Time - Stays around 0.25 seconds.

TCC Slip speed - 20 to 30 RPM within repective mph otherwise low #s 1-5.

Trans temp sensor - 3.0's Volts. reads Volts?. Gear change data did not change.
i got a bunch of other data, this is the TCC stuff.

sounds to me like a data issue? if i'me getting readings does this mean the comp. is telling converter to lock unlock?

I seem to remember swapping out the vac modulator on my 65 Chevy and moving on... dam.

06 i've herd everything from a bad diod in the altenator to a complete Enigine Controll Modue will cause this.

Awaitin input.

Thanks, Steve

Last edited by 65bluess; 10-07-2011 at 01:24 PM.
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Old 10-07-2011, 05:38 PM
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TCC solenoid fused?

is TCC solenoid fused? if so what will happen if i pull the fuse? (diag test)
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