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Old 12-02-2007, 03:48 PM
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700r4 Tcc ?

I was driving my 1991 GMC 5.7/ 700R4 with my scanner hooked up this morning. I noticed that going down the highway 65-70 mph, the TCC light is lite up showing the converter is locked up. When I would let off the gas the light would go out (converter unlocked), when I got back on the throttle the converter would lockup again.
Is this the normal operation?

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Old 12-02-2007, 09:34 PM
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Quote:
Originally Posted by 47 Coupe
I was driving my 1991 GMC 5.7/ 700R4 with my scanner hooked up this morning. I noticed that going down the highway 65-70 mph, the TCC light is lite up showing the converter is locked up. When I would let off the gas the light would go out (converter unlocked), when I got back on the throttle the converter would lockup again.
Is this the normal operation?
some what common.

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Old 12-02-2007, 09:38 PM
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GM changed operational parameters on later vehicles to allow TCC disengagement on "lift throttle". This allows the vehicle to slow without creating a chuggle or posting effect, ie. the trans driving the engine as would happen at slower speeds with the TCC on.
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Old 12-02-2007, 10:32 PM
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Thanks for the replies. I kinda thought it was like freewheeling.
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