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| Engineering/ Technical Ask technical questions about cars. Do you know how a car engine works? |
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#1
02-06-2006, 07:27 AM
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TCC lockup
Hi, I was wondering if anyone knows if there is any harm if you make an auto never lock up the TCC. I know it will use more fuel at highway speeds, but is there any potential for damage to the transmission itself? My only guess is at high speed the trans oil would get hotter than with the TCC locked up.
I read that early auto's didn't have converter lockup until emmision/efficiency issues arose in the early 70's So if you disconnected the solenoid, would the transmission suffer? and why? If you have any info, thanks! 
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#2
02-06-2006, 09:40 AM
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Re: TCC lockup
yeah, you are correct about the heat. lockup helps out a bunch with keeping heat out of an auto tranny. personally i wouldnt disable it if it was meant to be on the car. but youll need an extra trans oil cooler if you are determined to try it...
ive seen tons of trannys fail cause of tcc faults...
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#3
02-06-2006, 11:13 AM
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Re: TCC lockup
around360, it might help to know your reasons. If you just don't like it and want to disable it on a new tranny, it might be wise to do it the "right" way. But if you have an old tranny like a 200C that has the dreaded problem of not UNlocking and you want to crutch it temporarily, that's a different story.
It depends also on the transmission. Some will overheat, some just get a little warm, some will default into a limp mode and spike line pressures.
__________________
Dragging people kicking and screaming into the enlightenment.
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#4
02-06-2006, 07:59 PM
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Re: TCC lockup
Thanks for the quick responses. Looks like heat could be a prob.
My question about the clutch lock was mostly for knowledge. I have a car that has shudders on light load as the tcc engages. It has a jatco 4 speed auto from about '87. The car has a "power" button which when engaged, changes the shift pattern, and disables 4th (overdrive) and the TCC as well. This is how it is supposed to work and it works. Driving with "power" engaged, the TCC problem is bypassed. I also have a gm car with a 4l60 type auto with no tcc problem, but wanted to know mechanically and ignoring any electronic management if there is any reason (lets say for academic purposes)that they could not be run permanently without the TCC lockup. Both cars have trans coolers.
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