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Old 07-30-2004, 09:15 PM
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Clueless 4L60E question

I apologize if thisa is a dumb question, but its got me puzzled.

I've got a 1991 Sonoma that came with a 700R4. I did a V8 swap, and also replaced the 700R4 with a 4L60E, which came with the V8 I put in it. Everything seems to run fine, but here's the question:

When I'm slowing down from highway or higher speeds, before I start to put on the brakes, it sounds like it is downshifting a little. It doesn't do it around town, just when slowing from higher speeds. Its not as big a braking effect as if it really did drop into 3rd gear, but you definitely feel a little shift and a slow down. When I got around to putting a tach in it I expected to see the revs jump, but in fact they almost don't change at all.

Does anyone know what's going on? Anyone ever notice this with their 4L60E?

Just curious...thanks for your help,

Dave

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Old 07-30-2004, 10:24 PM
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Cool

I am curious if you have the factory GM computer controling the 4L60E or an aftermarket unit?

Programing could make the tranny act differently than normal
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Old 08-02-2004, 09:59 AM
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It is the factory VCM. In fact, the engine and tranny are stone stock (I needed to smog it in CA since I use it as a daily driver). The thing that is puzzling to me is that when it "shifts" (or whatever it is doing) you definitely feel it slow down but the tach doesn't spin up. A friend said he thought it was the computer stopping the fuel flow to the injectors. Could that be it?

Dave
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