transmission not shifting into 3 rd or 4th - 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 > Transmission Mods

Transmission Mods Performance Transmission Modifications

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  #1  
Old 01-08-2011, 09:20 PM
dfduncan02tb dfduncan02tb is offline
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2002 Chevy TrailBlazer LTZ
Sandstone Metallic 4.2L I6 4X4
Join Date: Jan 2011
Location: Mountain View, WY
Posts: 5
transmission not shifting into 3 rd or 4th

I have a 2002 trailblazer. The transmission seems to be fine in 1st and 2nd, but won't shift into 3rd or 4th. Today, we pulled the pan and changed the filter. The filter was pretty clogged, but there wasn't any metal in the pan, and the fluid wasn't burned. We also looked at the torque converter through the inspection port, and everything was clean. We are stumped. Any help would be good.
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  #2  
Old 01-09-2011, 12:59 AM
efi-diy efi-diy is offline
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1951 GMC 3100 PU Truck
hot rod black turbo'ed 4.2L I6 2WD
Join Date: Sep 2006
Location: Alberta, Canada
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How good are you with transmissions? I could give you advise but need to know your skill level.
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Turbo'ed 4200 @ 10 PSI == 510 RWHP 500 LB/FT Torque Rear wheel
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  #3  
Old 01-09-2011, 09:44 AM
christo829's Avatar
christo829 christo829 is offline
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2004 Chevy TrailBlazer LT
Silverstone Metallic 4.2L I6 4X4
Join Date: Mar 2009
Location: Fairfax, VA
Posts: 1,298
If you've got no warning lights on the dash, you may have a stuck valve/solenoid in the
control body for the transmission. Some of those can get gummed up if there's debris
in the system. From the sound of it, that's a strong possibility, and you can have a valve
get stuck and not generate a failure code.

If you *do* have a "Reduced Engine Power" or SES light on, there are conditions that will
cause the PCM to not allow the transmission to shift beyond 2nd, and you'll need to find out
what is causing that.

How many miles, and how's the maintenance record?

Good Luck!

Chris
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  #4  
Old 01-09-2011, 10:04 AM
dfduncan02tb dfduncan02tb is offline
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2002 Chevy TrailBlazer LTZ
Sandstone Metallic 4.2L I6 4X4
Join Date: Jan 2011
Location: Mountain View, WY
Posts: 5
I'm not very good with transmissions, but I'm good at figuring things out and at following directions. The trailblazer has around 130,000 mi, and the transmission was rebuilt less than 2 years ago at 110,000 mi. Could one of the shift solenoids need replaced? Also, when you put the shifter in "3", it's the same as when it's in neutral. The rest are fine. Seems plenty strong in reverse, 1st, and 2nd. Thanks for any help you can give.
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  #5  
Old 01-09-2011, 10:06 AM
dfduncan02tb dfduncan02tb is offline
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2002 Chevy TrailBlazer LTZ
Sandstone Metallic 4.2L I6 4X4
Join Date: Jan 2011
Location: Mountain View, WY
Posts: 5
Also, no codes or lights on the dash.
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  #6  
Old 01-09-2011, 10:20 AM
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christo829 christo829 is offline
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2004 Chevy TrailBlazer LT
Silverstone Metallic 4.2L I6 4X4
Join Date: Mar 2009
Location: Fairfax, VA
Posts: 1,298
Did you have any sort of warranty on that rebuild?

Sure sounds like a stuck valve. When you move the shifter in the D-3-2-1 ranges, you're not
actually putting the transmission in that gear as much as you're "allowing" it to reach that
gear in the normal process of upshifting or downshifting.

The fluid not being burnt is good, as it would tend to indicate that the higher gear
pack is not slipping, just never getting put in to play.

None of this is 100% guaranteed, but it does seem like it's a problem in the
control body. There are some articles in the Transmission Mods area that might give
you a better idea what's involved, and plenty of members who have upgraded
their transmissions, so they ought to be able to help.

If there was that much debris after a rebuild and only 20K, I'd be a bit suspicious of the
quality of the rebuild, but that depends on just how much they rebuilt. I suspect that that
debris is what caused the failure, but it could be that they never replaced some of the
valves/solenoids, and it carried over a problem from the original build of the transmission.

Cheers-

Chris
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  #7  
Old 01-09-2011, 10:02 PM
dfduncan02tb dfduncan02tb is offline
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2002 Chevy TrailBlazer LTZ
Sandstone Metallic 4.2L I6 4X4
Join Date: Jan 2011
Location: Mountain View, WY
Posts: 5
So am I looking at needing to have my tranny rebuilt? I looked at my paperwork from the last rebuild and the warranty was for 6 months. Not going back to that shop. Salt Lake City, UT is only an hour and a half away, so I may trailer it down there to get it fixed. If anyone knows of a good shop there, let me know.
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  #8  
Old 01-09-2011, 10:38 PM
efi-diy efi-diy is offline
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1951 GMC 3100 PU Truck
hot rod black turbo'ed 4.2L I6 2WD
Join Date: Sep 2006
Location: Alberta, Canada
Posts: 823
Consider getting a GM rebuild and do the install.
__________________
Turbo'ed 4200 @ 10 PSI == 510 RWHP 500 LB/FT Torque Rear wheel
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  #9  
Old 01-09-2011, 10:55 PM
dfduncan02tb dfduncan02tb is offline
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2002 Chevy TrailBlazer LTZ
Sandstone Metallic 4.2L I6 4X4
Join Date: Jan 2011
Location: Mountain View, WY
Posts: 5
I'm hoping to save some money on this, and I found a shop in Salt Lake City that will rebuild it for me for an hourly rate plus parts. I'm thinking that there's not very much of the tranny that needs rebuilt, so that may be fairly inexpensive. As for pulling it out and putting it back in, I'm not sure how involved it's going to be. I read one post that gave a step by step on how to do it, and it said that the catalytic converter needs to be removed, and I'm not sure I have the tools to do that. Is it as difficult as it seems to be?
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  #10  
Old 01-11-2011, 08:15 PM
johnnys50stang johnnys50stang is offline
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2002 Chevy TrailBlazer LT
Imperial Blue Metallic 4.2L I6 2WD
Join Date: Aug 2010
Location: Denison,Texas
Posts: 11
just got my 02 trailblazer back 187000 miles rebuilt tranny hopefully make another 187000
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