4l80 only have reverse and 1st - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 2 (permalink) Old 12-08-2009, 02:17 PM Thread Starter
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Arrow 4l80 only have reverse and 1st

This is a company truck, a Chevy gasser van/chassy. Trans was redone about 4 months ago, Im sure has 10-20k on it since complete rebuild. Was being driven down the road and lost drive. Fluid was about 2 quarts low, I got first gear back and it never lost reverse. Is it toast? What should I check out?

-Justin
1994 Chevrolet K3500 CCLB dually 6.5 (mine)
1997 Chevrolet C3500 CCLB dually 6.5 (wifes)
Couple other GM's,some trailers, tractors, and about a half dozen horses...

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post #2 of 2 (permalink) Old 12-09-2009, 01:31 PM
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unless you were really working it, i cant see where being 2 qts low would have killed it. i have had a couple differnt issue with 4l80' in my gm diesels. the first one briefly would shift out of od for no reason. did this a few times over a period of about 2 months. one day with no warning of any kind, the truck went from doing fine to locking up in reverse. it quit moving period. the other issue i had with the 4l80, some how i knocked the od out when installing an injector pump on another truck of mine. i was installing the intake an something sparked, after that no more od! anyway, from what you speak of, i would say there's internal issues with your's, if you have no leaks in any of the lines or connections. does it function properly now?
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