P0740 TCC Failure - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-15-2009, 11:18 AM   #21
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Quote:
Originally Posted by Tequila Man View Post
The part that Johnd89 mentioned probably won't help you. That valve controls the on off function for the tcc. Your tcc is turning on. The problem is low apply pressure for the clutch. This is the part that would most likely help you.
Sonnax Transmission, Torque Converter, Performance, Driveline Parts :: Transmission :: 84754-01K :: Part Summary
This valve has extreme wear since it constantly buzzes in the bore while tcc is engaged. The other valve just clunks back and forth for engagement and disengagement.
I do not recommend going into the valvebody unless you have experience working on trannies. I have seen many people in the trade make mistakes.
But if you do try, Make sure you have new valvebody gaskets ready. And don't lose any of the check balls that will fall out.
Thanks for clearing that up Tequila Man, too bad you aren't closer. I would bring it to you. So what would you guess this would cost to have repaired? Just ball park. This is the only issue with the tranny and if I use cruise control it doesn't happen.
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Old 08-15-2009, 09:58 PM   #22
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Realistically, you are looking at 400 to 600 dollars to fix this. That is to do a torque converter, install the valve, and a new filter and fluid, of coarse. I think this is a fairly cheap price.
Personally, once the tranny is out of the vehicle, to replace the tc that has been forced to slip for so long; I would at least inspect the rest of the unit. There are too many parts that are known to fail to not do this.
I am in Massachusetts and if you where close enough I would be able to help you out on keeping your costs down.
Hope it all works out for you
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Old 08-16-2009, 12:36 AM   #23
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Thanks for the info Tequila Man.
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