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Tranny problems wont shift into 3rd

Tranny problems wont shift into 3rd

Postby Alberta_bound24 [OP] » Jun 27 2013, 3:39am

I have a problem with my 2008 Chevy Silverado with only 97,000km on it.
the truck will run through first gear and second Just fine but when it hits third the revs jump up like its in neutral but will engage the tranny at about 4,500 to 5,500 RPM dose anyone know what that could be? Also just after this happened the trailer brake system service came up on the dash please help
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Re: Tranny problems wont shift into 3rd

Postby SilverSurfer » Jul 12 2013, 10:45pm

You didn't describe your truck much, but I found this TSB. I think the transmission they listed is in a 3/4 ton. See if this fits your problem:

TECHNICAL

Bulletin No.: 09-07-30-004I

Date: May 10, 2012

Subject: Slips in Reverse or Third, Delayed Reverse or Drive Engagement, DTC P0776, P2715, P2723, Harsh 2-3 Shifts (Inspect 1-2-3-4 / 3-5-R Housing and Pump Seal Rings)
Models:
2006-2009 Cadillac STS-V, XLR, XLR-V
2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT, XLR
2006-2009 Chevrolet Corvette
2007-2008 Chevrolet Silverado
2008 Chevrolet Suburban
2007-2008 GMC Sierra, Sierra Denali, Yukon Denali, Yukon XL Denali
2008 GMC Yukon XL
2008-2009 HUMMER H2
2008-2009 Pontiac G8

Equipped with 6L80 or 6L90 Automatic Transmission (RPOs MYC, MYD)
Supercede:
This bulletin is being revised to add the last Important statement under 2006-2009 Vehicles section and add the transmission filler tube to the Parts Information. Please discard Corporate Bulletin Number 09-07-30-004H (Section 07 - Transmission/Transaxle).

Condition

Some customers may comment on any of the following conditions:

- Slip when Reverse is selected or no reverse.

- Delayed engagement into reverse.

- MIL illuminated. DTCs P0776, P2715 or P2723 are found as an active or a history code in the TCM.

- Harsh shifts from second to third.

- Harsh shifts from fourth to fifth or slips in fifth.

- Slips on acceleration when passing.


2006-2008 Vehicles

Cause

This condition may be caused by a cracked 1-2-3-4 / 3-5-R clutch housing.
_______________________________________________________________________________________________

The rest of the TSB tells the technician how to perform the inspection, it's internal to the tranny.
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