95 Bonneville, 4t60e transmission, code 740..your opinions - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-09-2007, 01:51 PM   #1
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Default 95 Bonneville, 4t60e transmission, code 740..your opinions

My car was throwing a check engine light. I had the car checked out and the mechanics found a leak in the throttle body, a hole in the EGR valve tube as well as dirty fuel injectors. They resealed the throttle body, replaced the EGR valve tube and cleaned the injectors ($300). Now the car runs quite well...no check engine light anymore. So everything was fixed...except for this transmission problem. I had a code pulled...code 740 ( "tcc circuit malfunction"). The car does fine when "cold"...the tcc locks up and stays locked up. There IS a hint of vibration/shudder though even when cold. The rpms drop at lockup like they should. BUT when the car heats up, the tcc just won't engage at all WHILE MY FOOT IS ON THE GAS. Overdrive does engage. The higher rpms cased by this tcc lockup failure make it just seem like its not in "od". (I understand the tcc lockup causes the rpm drop in "OD" in this transmission.) When I manually shift into regular "d"out of "od" WITH MY FOOT OFF THE GAS, the rpms jump up, telling me that od is working. It seems that the tcc, once it gets hot, is unable to lock-up unless I take my foot off the gas. Is this what the SONNAX parts manual calls "low converter apply pressure"? All in all, the manual says that this 740 code and these symptoms point to a bad TCC REGULATOR VALVE system( isolator valve, regulator valve and regulator sleeve) . The shop quoted me $485 total, 450 labor and 38 for the replacement kit. The old transmission has a warranty. I only paid 300 for the transmission, so it looks like this will cost me about 150 if MIDWESTAUTORECYCLING honors the warranty. I just wanted to get some opinions about my conclusion. They have ordered the kit #84754-01k from SONNAX. I want to make sure I'm spending money on the right solution. Am I right about my conclusion?
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Old 04-09-2007, 02:13 PM   #2
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Which model do you have?
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Old 04-09-2007, 02:16 PM   #3
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the basic model....no supercharger
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Old 04-09-2007, 04:25 PM   #4
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So - is this different than what you have going in this post?
http://www.bonnevilleclub.com/forum/...ic.php?t=74471
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Old 04-09-2007, 04:32 PM   #5
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same post...delete it if you want...the other post is old so i figured I ought to put a new one up.
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Old 04-09-2007, 05:14 PM   #6
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Use the other thread, it'* hardly old.
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