4L80E trans flare up

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Oct 7, 2014 | 12:51 PM

Sctmcly

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4L80E trans flare up

Hi everyone,
I have a 2004 Silverado 2500 (non hd) when I accelerate lightly, between the 2-3 up shift, it seems to flare up before completing the shift. Only by a couple hundred rpm. Any thoughts?

Oct 8, 2014 | 12:30 AM

89scottsdale

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so what you are saying is the tranny seems to be missing a shift? or the motor is revving to get to the shift?

Oct 8, 2014 | 9:58 AM

Sctmcly

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The engine is revving up 2-3 hundred Rpm between that shift. Like it was slipping. Doesn't happen on a hard accel though.

Oct 8, 2014 | 11:24 AM

Allan In NE

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Are you sure this isn't a 4L60E? 4L80 uses a stacked shift, whereas the 4L60E has a timed shift.

Allan

Oct 9, 2014 | 12:40 PM

89scottsdale

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Does the fluid Snell burnt or is it low?

Oct 12, 2014 | 3:55 PM

Sctmcly

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Fluid is full and smells good. And yes, is Is a 4l80e

May 7, 2020 | 12:54 AM

Sh!tboxer

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From: Oregon

Following..mine is doing the same, no rhyme or reason, does it one day, might not do it again for weeks... never flares in tow/haul mode...only easy driving to work...

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Nov 4, 2023 | 11:11 PM

JCSilv

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Joined: Nov 2023

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From: North Carolina

2000 25000 nonhd

Quote:

Originally Posted by Sh!tboxer

Following..mine is doing the same, no rhyme or reason, does it one day, might not do it again for weeks... never flares in tow/haul mode...only easy driving to work...

My Chevy 2500 Silverado 373 rear end gears when I have no trailer attached sometimes it shifts sort of hard between second and third and seems like the overdrive is comes and goes but when I have a trailer and loaded it never shifts hard like that and I wondered if it was something solenoid or something like that before I go change the transmission any ideas

Nov 5, 2023 | 6:51 AM

Allan In NE

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Quote:

Originally Posted by Sctmcly

Hi everyone,
I have a 2004 Silverado 2500 (non hd) when I accelerate lightly, between the 2-3 up shift, it seems to flare up before completing the shift. Only by a couple hundred rpm. Any thoughts?

Leaky seal or wobbly piston on either the 1/2 or 3/4 accumulator.....