Transmission Problems

georgerosen06 · October 23, 2007

Alright so ive been having some problems with my transmission and ive looked at it a couple times and checked the fluid and I cant see anything wrong. What happens is whenever im coasting and then i push the gas pedal it makes like a clicking sound (not sure if thats good bad or normal you tell me!). And then when im in traffic and slowly moving around and then I really lightly get on the gas it sort of jumps into second however when im just driving along and i get into second it dosent jump. Is there anything I can get checked or anything I can look for. And has anyone else had this problem???

jrrod2004 · October 23, 2007

Alright so ive been having some problems with my transmission and ive looked at it a couple times and checked the fluid and I cant see anything wrong. What happens is whenever im coasting and then i push the gas pedal it makes like a clicking sound (not sure if thats good bad or normal you tell me!). And then when im in traffic and slowly moving around and then I really lightly get on the gas it sort of jumps into second however when im just driving along and i get into second it dosent jump. Is there anything I can get checked or anything I can look for. And has anyone else had this problem???

I dont have a 4x4 but it sounds like it could be coming from your transfer case, I have heard of this and GM has a few bulletins as well as calibrations out for the noise if it is coming from the transfer case itself, if it is your transmission then it may be something else, let us know.

fireman32_14 · October 23, 2007

mine makes a clicking sound sometimes when i get on the gas from a standstill, its very faint, i can only hear it with the windows down and the radio off though

jrrod2004 · October 23, 2007

mine makes a clicking sound sometimes when i get on the gas from a standstill, its very faint, i can only hear it with the windows down and the radio off though

Sorry guys, cant make heads or tails but here is some info that might help:

Document ID# 1926723

2004 Chevrolet Chevy K Silverado - 4WD

Subject:Rattle Noise at Highway Speed in 2WD or DTC C0327 - keywords 246 2hi 2high 2wd 4wd auto awd buzz case click indicator knock lamp light service tick transfercase trans vibration #PIP3480L - (03/21/2007)

Models:2004-2006 Chevrolet Avalanche, Silverado Classic, Suburban, Tahoe

2004-2006 GMC Sierra Classic, Yukon, Yukon XL

with NVG 246 (RPO - NP8) Transfer Case

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:

Rattle noise from under the vehicle in 2WD only at approximately 60-65 mph and above. The noise will go away when shifted to either auto or 4WD hi. The noise can be duplicated with the vehicle on a hoist. The noise will be heard from the transfer case using a stethoscope or chassis ears. Vehicles involved were built approximately between 01/01/04 and 03/06/06. The rattle condition if not noticed by the customer may cause eventual encoder sensor wear causing DTC C0327 set in the Transfer Case Control Module (TCCM).

Recommendation/Instructions:

An updated TCCM calibration has been released to apply light pressure to the transfer case clutch pack and reduce the rattle. The calibration is scheduled for release on 3/18/07 and the title line will read "to correct transfer case rattle at highway speeds and possible DTC C0327". For Rattle only (no current DTC C0327 set), Install the updated calibration and if necessary follow the diagnostics listed below.

If the vehicle has a current or history dtc C0327 and can be diagnosed to the encoder sensor, re-flash with the updated calibrations and replace the encoder sensor as necessary.

Important note: All NV246 transfer cases built 02/25/06 and beyond are manufactured with pressed fit parts to help reduce the rattle. Inspect the ID tag on the transfer case for this build date and verify the tccm has the latest calibration before repairs are initiated.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

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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AND / OR

Document ID# 1731813

2004 Chevrolet Chevy K Silverado - 4WD

Subject:Ping, Pop, Snap or Click Noise from the Propeller Shaft - keywords accelerate axle differential drive driveline garage gear intermittent noise ping pop prop propshaft rear reverse shift tick #PIP3105D - (11/18/2005)

Models:1999-2006 Chevrolet Silverado

1999-2006 GMC Sierra

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:

Some customers may comment on a ping, pop or click noise from underneath the rear of the vehicle, when shifting into reverse or drive, or out of reverse into drive or possibly drive to reverse.

Recommendation/Instructions:

The noise is originating from inside the propshaft. Please replace the propshaft with the part numbers below.

On 1999 - 2006 C1500 C15903 (Reg cab 8' box) trucks equipped with 4L60E (RPO M30) and 3.23 or 3.42 axles (RPOs GU5 or GU6) use propshaft 15189835. This is the propshaft for these trucks built with 3.73 (RPO GT4).

K1500 trucks with 143.5" wheelbase which are K15543 (crew cab 5'9" box) and K15753 (extended cab 6'6" box) used 2 different u-joint sizes. Production change was made on 10/28/2004.

On 1999 - early 2005 - K15753/15543 (143.5" wheelbase) with M30 - Use 5" design 15751438 (Smaller U-joint shafts built 1999 through 10/28/2004)

On late 2005 - 2006 K15753/15543 (143.5" wheelbase) with M30 - Use 5" design part 10382035. (U-joint upgrade shafts - Vehicles built after week of 10/28/2004)

All 2005 - 2006 K15543 (143.5" wheelbase) with M32 and NP3 - Use 5" design from Silverado SS - 10382033 - All 2005 and future have the big u-joints.

2002 - 2004 K15753 with all wheel steer (RPO - NYS) and NP3 - Use 5" design 10382035

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

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.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION