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Old 09-11-2013, 03:11 PM
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no TCCPWM on valve body

I am in the process of a rebuild because of a torque convertor failure and subsequent fluid contamination. This unit from a 94 Silverado was rebuilt in 01, so has lasted for 12 years. Band and clutches still looked fairly good, but had no TCCPWM on valve body. Torque convertor lock-up did engage when I drove it and felt like a 5th gear. Could this be a modification done on the last rebuild, and what would you reccommend for me at this point? Could this also have been the reason for the torque convertor failure? This unit also had 1 oversized checkball in the valve body. I appreciate your expertise, experience, and any advise you can give me. Thanks for your help Mark

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Old 09-11-2013, 03:37 PM
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TCCPWM- Torque Converter Clutch Pulse Width Modulation

Perhaps you mean TCC Sol Torque Converter Clutch Solenoid

Pulse width modulation is the electrical signal (from the PCM) that allows the converter to lock up. The pulse is apllied to the solenoid for smooth engagement.
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Old 09-11-2013, 04:12 PM
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The '94 didn't use PWM, they started that in '95. As for the convertor failure, I can't help with that.
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Old 09-11-2013, 04:41 PM
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Thanks for your help

I just looked at a valve body for that year, and saw it didn't have that solenoid. I really appreciate your help. I am replacing the seperator plate with a Transgo hd, should I go with standard check balls, and get rid of the one oversized checkball? The only damage I could find was minor scoring on the pump assembly, which I'm replacing. Any advise on what else I should look for would be greatly appreciated. Thanks so much Mark
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Old 09-11-2013, 04:52 PM
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Quote:
Originally Posted by ssimpala View Post
The '94 didn't use PWM, they started that in '95. As for the convertor failure, I can't help with that.
Now that you mention it,... that sounds correct ssImpala.
Torque converter prolly just wore out.
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Old 09-11-2013, 05:06 PM
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As said earlier,95 was the 1st yr for PWM.I would @ least do basic rebuild,clutches,band,etc.Also,there are several updated hard parts I would consider as well,if they haven't been already.
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Old 09-11-2013, 05:17 PM
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I'm no transmission expert by any means but some of my friends are. Try this Stickied: The truth about many "Upgrades" and "Performance" parts for 4L60E's - Chevrolet Impala SS Forum : Chevy Impala SS Forums Hope this helps, Bill.
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Old 09-11-2013, 08:46 PM
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Originally Posted by ssimpala View Post
I'm no transmission expert by any means but some of my friends are. Try this Stickied: The truth about many "Upgrades" and "Performance" parts for 4L60E's - Chevrolet Impala SS Forum : Chevy Impala SS Forums Hope this helps, Bill.
Thanks for that link.Good read & info.A trans guy told me he built his entire home & shop off of 4L60E's !!!
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Old 09-12-2013, 06:21 AM
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Thanks for that link. That answers a lot of my questions and saves me from the temptation to purchase upgrades. Especially since this unit performed fine before the convertor went. Thanks again.
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