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Old 07-20-2004, 11:35 PM
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4L60E transmission problems

Does anybody have a link to a troubleshooting guide for this tranny?

It's not shifting right intermittenly. I'm thinking that its overheating and i should install a secondary cooler but want some more information on what could be causing this and if something is ruined. It shifts just fine until I pull a big hill or mountain pass....

1996 Suburban with a 350 sb

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Old 07-21-2004, 09:03 AM
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Cool

Is your speed-O functioning correctly?
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Old 07-21-2004, 03:07 PM
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^^^^ what he said ^^^^

other thing is that I would scan for codes. Since this trans is 4L60E, there "might" be solenoid issues.

Chevy did have valve body update for slow shifting concern.
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Old 03-20-2005, 11:04 AM
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4l60e shifting problems

Quote:
Originally Posted by Crosley
Is your speed-O functioning correctly?
Hello. my speed-o no functioning at all.trans not shifting.abs light is on .
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Old 03-20-2005, 11:25 AM
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NO speedo NO UPSHIFT. The speed sensor and or wiring needs inspection. Speed sensor feeds vehicle speed to PCM for upshift timing.

Bichin69
1996 Suburban: Look at two things. Does the gearshift indicator not work when it doesn't upshift? These vehicles are known for problematic ignition switches. Switch feeds the current to the shift solenoids. Probably WON'T set trouble code. Also, most of these trucks had a grounding problem related to the PCM harness. There is a simple update that can be installed to remedy this issue. Will not cause upshift issue, but will cause slow trans death. Possible issue includes a shift slip, appearing as no upshift.
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Old 03-20-2005, 12:39 PM
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Three things;

Chazmac; watch the dates on the posts... this thread is 8 months old till polleo brought it back to life.

polleo; as Chazmac posted ; " no speed-O, no shifts" The speed-O must function for the PCM to operate correctly.

IF the speed-O head was broken , the PCM would still get a signal from the vehicle speed sensor , which means the vehicle would shift and operate.


what year , make and model of vehicle?
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Old 03-26-2005, 12:32 PM
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4l60e shifting problems

Quote:
Originally Posted by Crosley
Is your speed-O functioning correctly?
I could 'nt find the problem.I found that the brown wire or c9 coming out of the vehical speed sensor buffer needs a 12 volt key on hot .so I gave it one one every thing runs fine and the abs light went out and their is no ecm codes present. This is a mystery .That wire is going to the ignition switch. I even replaced that to.Well I order a wiring diagram.In tell I find out what the real problem is .I still have a quick fix .thanks again.
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