Transmission pump issues? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 02-16-2011, 09:36 AM
Dr Fildo Dr Fildo is offline
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2005 Chevy TrailBlazer LT
Summit White 4.2L I6 4X4
Join Date: Mar 2010
Location: Central Jersey
Posts: 40
Transmission pump issues?

Has anyone else here had transmission pump issues? My '05 Trailblazer had had 3(!) pumps replaced since March of 2010. AAMCO says that the pump keeps "cracking". 2 different shops, one in NJ and one in NY where I was stranded replaced the pump.

Most recently, as of yesterday, when I picked the truck up from the shop, I was told that they (AAMCO) called Chevy and Chevy told them that they (Chevy) were aware of an issue with the flywheel that would cause the transmission pump to fail; so AAMCO replaced my flywheel.

Any thoughts??
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  #2  
Old 02-16-2011, 09:38 AM
wardak33's Avatar
wardak33 wardak33 is offline
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2002 Olds Bravada
Pewter Metallic 4.2L I6 AWD
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Location: Schaumburg, IL
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Highly unusual..Never heard of a pump failing in our 4l60e's.


Are you leaking/low on fluid? Keeping up with maintenance as you should? What type of fluid are you using? How many miles on the truck?
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2002 Oldsmobile Bravada: 4.2L I6 w/ G80 Locker, AWD, TBSS springs, HD bilsteins, 6000k HIDs, Mobil1, Iridium Plugs
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  #3  
Old 02-17-2011, 11:46 AM
Dr Fildo Dr Fildo is offline
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2005 Chevy TrailBlazer LT
Summit White 4.2L I6 4X4
Join Date: Mar 2010
Location: Central Jersey
Posts: 40
75K on the clock. Tranny gives no warning when it fails. Just stops pushing. I maintain the thing religiously. Always have.
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Old 02-17-2011, 03:25 PM
ScarabEpic22 ScarabEpic22 is offline
Northwest Chapter
 
not here not here not here
not here Other AWD
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Um so dont use AAMCO?

Sounds like bad luck, I havent heard of many transmission pumps going out on 4L60Es, let alone in our trucks (SSs excluded, they eat the 4L70Es for breakfast).

See if they'll put a replacement transmission in, 3 times in a year is insane.

What are the symptoms you experience before you take it back in?
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Old 02-22-2011, 09:42 AM
Dr Fildo Dr Fildo is offline
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2005 Chevy TrailBlazer LT
Summit White 4.2L I6 4X4
Join Date: Mar 2010
Location: Central Jersey
Posts: 40
No symptoms. Runs beautifully and then the RPMs just head for the sky, like it slipped into neutral. No sound of anything breaking, no smells, no smoke, no fluid leaking, no grinding...nothing. Happened 2X while cruising on flat road at 1800-2000 RPMs. No gears, forward or reverse.

So it makes it very hard for me to have piece of mind that it will run problem free, because I'm always expecting the next failure...could happen at any time.

I used AAMCO the 1st time because Chevy wanted over 4 grand to fix the trans with a 1 year, 12k mile warantee. AAMCO has been honoring the 3 year, 36k mile warantee, but each time it's in the shop for over a week.
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  #6  
Old 04-09-2011, 09:05 PM
naterator naterator is offline
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2003 Chevy TrailBlazer LTZ
Graystone Metallic 4.2L I6 2WD
Join Date: May 2008
Location: Fort Worth
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A little late to the dance, but yeah, I'm on my fourth transmission in six months. The mechanic just called to say that it's the transmission pump (which, according to him, doesn't fail very often in the 4L60E) that has caused the multiple failures. He's replacing the pump this weekend and will hopefully be back on the road Monday. I sure hope so, the car has been down for six weeks since Thanksgiving.

On a side note, this remarkably coincides with my last payment...hmm...
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