Question about 2003 GMC Sierra 1500

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Hi, I have an oil leak from the case of the transfer box on my 2003 sierra 2500, looks like the case is worn through from the inside, can you help, is this a problem, thanks Stan

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Yes it is a problem. There is a new design clip. The case needs to be disassembled, repaired and the new clip needs to be installed, or you will burn out your transfer case.

Posted on Oct 02, 2009

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Posted on Jan 02, 2017

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1 Answer

Will not having proper lube in rear transfer case make truck clunk


No. The transfer case takes Dexron/Mercon 3. What was installed instead, for fluid? If motor oil or gear oil was used instead. That would not cause a clunk. It would cause a loss of fuel economy. When vehicles get old and the mileage ads up. Parts loosen up and/or wear out. Clunking in the drive train could be related to the transfer case but could also be related to the drive shaft or the rear drive axle. Worn or bad splines, U-joints (rusted, loose, or seizing), worn ring and pinion is possibe too. If I can be more help just let me know. The more information and details that you can give, the better. Thank you.

Feb 23, 2014 | 1989 GMC Sierra

1 Answer

Leaking Transfer Case


most Gear boxes with transfer cases have an oil seal between the main gear box and the transfer case so that the oil from the box is not passed through to the transfer case causing it to over fill. If there only a few spots under the car you have time to find exactly where the leak is. May be only an output shaft seal. Check the level of the gear box and transfer case your self It will be level with the filler plug. The oil used is either sae80-90 or oep 80-90. Check manufactures specs on this. If it turns out to be the seal between the two boxes then it will require the unit removal for seal replacement.

Apr 25, 2013 | 2003 Chevrolet Tracker

2 Answers

Does anyone know of a website i can get a diagram of my 03 2500hd's tranny and transfer case, cant figure out where my atf leak is coming from.


LEAK AT TRANSFER CASE COMING FROM DIFFERENTIAL PINION SEAL OR THE TRANSFER CASE SEAL LEAKING.YOU CAN GO ON LINE TO ON LINE AUTO REPAIR MANUAL ON AUTO DATA MANUALS YOU SHOULD BE ABLE TO FIND TRANSFER CASE DIAGRAM BUT YOU HAVE TO PAY TO USE SITE FOR 3 TO 6 MONTHS.

May 05, 2011 | 2003 GMC Sierra 2500HD

1 Answer

2003 gmc 2500 sierra oil pressure sending unit where is it


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Fig. Oil level sensor location on 2002-2005 4.8L, 5.3L, 6.0L

Hope this helps.

Jan 31, 2011 | 2003 GMC Sierra 2500HD

4 Answers

I have a 2003 gmc sierra 5.3 liter vortec why does my truck leak oil only under pressure


because your oil pressure rises to around 40psi when running and will leak at the weakest place,check your oil sending unit first and seals.






Tim

Oct 20, 2010 | GMC Sierra 1500 Cars & Trucks

1 Answer

2003 Sierra 2500hd transmission or transfer case making grinding noise (sounds like a bearing going bad) it becomes louder when i give it gas. i checked the fluid in the transfer case which looked ok, i...


Sudden grinding noise with no prior warning * Primarily in 2nd gear, behavior in reverse may be abnormal; sunshell is fractured. R&R. Try not to run or drive the car or further damage could result.

* Reaction planetary is worn out due to high miles or insufficient lubrication. Not a critical failure, but not a good sign either. R&R sooner rather than later.

* Either a torrington bearing or a planetary bearing is on its way out. Trans will eventually die a loud, catastrophic death. Cheaper to rebuild now (saves further damage to hard parts), but requires R&R. It is drivable until it breaks.

Good luck and thank you for using fixya.

Mar 17, 2010 | 2003 GMC Sierra 2500HD

4 Answers

Fluid in a transfer case


if it is an electric shift t-case gm has there own oil not found at auto part stores

Sep 18, 2009 | 2003 Chevrolet Silverado 1500

2 Answers

Where is the 4x4 encoder motor sensor located on my 03 sierra


the encoder motor sensor is inside the encoder motor. the encoder is located at the transfer case. Remove the encoder and by part number 88962315 this is the sensor. you will have to retime the motor after
hope this helps

Feb 16, 2009 | 2003 GMC Sierra

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