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Old 02-18-2011, 09:26 PM
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4l80e no go

stopped at a stoplite. light turned green, no go. made a strange whining noise for about 4 miles before. in drive, at about 2000 rpm it will creep forward very slowly, and the same in reverse and all other gears. no dtc's on the reader. fluid and filter change about a year ago. fluid is red and full. any ideas, or is it smoked?
garthr

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Old 02-18-2011, 09:33 PM
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Quote:
Originally Posted by garthr
stopped at a stoplite. light turned green, no go. made a strange whining noise for about 4 miles before. in drive, at about 2000 rpm it will creep forward very slowly, and the same in reverse and all other gears. no dtc's on the reader. fluid and filter change about a year ago. fluid is red and full. any ideas, or is it smoked?
garthr

Any idea on year , make , model , mileage of this vehicle?
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Old 02-18-2011, 09:42 PM
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oh yeah, forgot the particulars. 2001 silverado, 1500hd ls 4wd about 180 thousand.
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Old 02-19-2011, 01:00 AM
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From my experience the first to go out in any GM product is the tranny. Although I just got rid of a 98 suburban 4wd and 250xxx miles on it but the tranny was solid. At 180xxx that tranny should still have tons of life left. What all have you done other than tranny fliud change?
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Old 02-19-2011, 01:33 AM
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Sounds like maybe the pump. Not sure what you should do next, maybe pressure test?
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Old 02-19-2011, 01:35 AM
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X2^^^, Pump or Converter.
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Old 02-19-2011, 07:24 AM
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typically the whine noise on a high mileage trans is caused by a filter clogging up.

I would suggest dropping the pan. Take the filter and break it open to see what if any debris is inside.
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Old 02-19-2011, 08:06 AM
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Before tearing into the trans, be sure the transfer case isn't in neutral. I had the same problem in my 99 Chevy. The trans was 6 mo old and after making a whining noise, the truck just wouldn't go. Turns out a passenger had bumped the transfer case lever and the linkage had vibrated into neutral over the next few miles. Put it back in 2WD and everything was fine.
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Old 02-19-2011, 09:09 AM
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thanks for the help. i'll drop the pan and have a look. isnt the pump located just behind the converter? last fluid and filter change about a year ago, oil was red, and the filter was looking pretty clean. a small amount of metal particles on the magnet.
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Old 02-19-2011, 09:15 AM
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a bench vice or vice grip type pliers are good to rip open the filter edges.

be careful! sharp edges will cut you fast
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Old 02-20-2011, 09:42 AM
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have dropped the pan and it doesnt look good. oil was a red tinged brown and didnt smell good. lots of metal pieces and particles all under 1/4". a lot of metallic mud on the magnet and elsewhere in the pan. looks like a replacement is needed. thanks for all the good advice.
garthr
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