4L80E acting up... any help??
09-15-2011, 03:25 PM
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4L80E acting up... any help??
My buddy has an 01 Suburban 2500 with an 8.1L, it just hit 100K a few months back. This past weekend we went on a camping trip and it was fine the whole way there, until we tried to park it and realized it had lost reverse. Seems to shift ok under regular driving, but one other thing we did notice is when you put it in 1st gear and start going, it wont hold its RPM's.
Ex: If i put it in 1st gear and slowly drive up to about 20-25mph and its at 3K RPM, and i let off the gas... the RPM just drops down to idle and doesnt hold. And if i try to give it some gas, it will rev back up to 3K before i moves again.
Any ideas before we pull the trans?? We already did a fluid and filter change on it and the fluid looked fine when it came out and didnt smell burned at all.
Ex: If i put it in 1st gear and slowly drive up to about 20-25mph and its at 3K RPM, and i let off the gas... the RPM just drops down to idle and doesnt hold. And if i try to give it some gas, it will rev back up to 3K before i moves again.
Any ideas before we pull the trans?? We already did a fluid and filter change on it and the fluid looked fine when it came out and didnt smell burned at all.
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09-17-2011, 03:23 PM
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