Jeremy, here is some info that might help on your transmission.....
Document ID# 1712859
2003 Chevrolet Chevy C Silverado - 2WD


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Diagnostic Trouble Code (DTC) P0757 Set, Service Engine (SES) Lamp Illuminated, Poor Performance of Transmission, Transmission Slipping (Clean Transmission Valve Body and Case Oil Passages of Debris) #01-07-30-038C - (Oct 12, 2005)
Diagnostic Trouble Code (DTC) P0757 Set, Service Engine Soon (SES) Lamp Illuminated, Poor Performance of Transmission, Transmission Slipping (Clean Transmission Valve Body and Case Oil Passages of Debris)
2006 and Prior GM Passenger Cars and Light Duty Trucks

2003-2006 HUMMER H2

2006 HUMMER H3

2005-2006 Saab 9-7X

with 4L60-E/4L65-E Automatic Transmission (RPOs M30/M32)

This bulletin is being revised to add model years and models and change the part number. Please discard Corporate Bulletin Number 01-07-30-038B (Section 07 - Transmission/Transaxle).

Condition
Some customers may comment on any of the following conditions:

• The SES lamp is illuminated.

• No 3rd and 4th gear.

• The transmission does not shift correctly.

• The transmission feels like it shifts to Neutral or a loss of drive occurs.

The vehicle free wheels above 48 km/h (30 mph). High RPM needed to overcome the free wheeling.

Cause
The most likely cause is chips or debris plugging the bleed orifice of the 2-3 shift solenoid (367). This will cause the transmission to stay in 2nd gear when 3rd gear is commanded and return to 1st gear when 4th gear is commanded.

DTC P0757 may also be set if the 2-3 shift valve (368) or 2-3 shuttle valve (369) were stuck, restricted and/or hung-up in its bore.

Correction
• Inspect/Clean the 2-3 shift valve (368), the 2-3 shuttle valve (369) and the valve bore of debris/metal chips.

• Inspect/Clean the 2-3 shift solenoid (367) opening of debris/metal chips. While inspecting the 2-3 shift solenoid (367), look for a screen over the solenoid opening. If the solenoid DOES NOT have a screen, replace the solenoid with P/N 24230298 that does have a screen over the solenoid opening.

Refer to the appropriate Service Manual for additional diagnostic information and service procedures.

Parts Information
Part Number
Description
Qty

24230298
Valve, 2-3 Shift Solenoid
1


Warranty Information
For repairs performed under warranty, use the applicable published labor code and information.



GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
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Document ID# 1712859
2003 Chevrolet Chevy C Silverado - 2WD

 

That looks bad, hope it gets worked out. Right after I race you

 

Thanks a ton Randy. I'm printing that out and hope to get the truck somewhere by the end of this month.

This describes pretty much exactly what is going on....

• The transmission feels like it shifts to Neutral or a loss of drive occurs.

The vehicle free wheels above 48 km/h (30 mph). High RPM needed to overcome the free wheeling

When I get off of the gas, it shifts firm and when its supposed to. I have all the gears, except when I get down on it hard. It will hold gear fine and will cruise with no problems. I really think this is my problem now.