Question about 2003 GMC Sierra 2500HD

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How to rebuild the transfer case on a 2003 chevy 2500hd with a 8.1liter

The tail shaft bearing has movement also the input shaft seal is leaking

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 2003 GMC SIERRA 2500HD

I have the same issue...what's the fix?

Posted on Oct 01, 2008

  • 383 Answers

SOURCE: oil seal leaking on 1999 gmc half ton 4w/d on front of transfere case do i need special tools or can I drop drive line and replace seal

billbohman: Unless GMC has had some change I am not aware of and that has not been published in service manuals for the repair of these units, the procedures are the same as any seal replacement and require no special tool. There are some universal seal installation tools which I would venture the majority of techs don't have because they substitute other tools in their place most of the time. Most techs will have a special tool designed from removing seals. However, the seal can be removed without it.
Just use a little common sense when removing a seal. Don't damage the casing.
Good Luck.

Posted on May 10, 2009

  • 599 Answers

SOURCE: low level sort of grinding sound in drive train @ 20-30 mph. no

most probable cause is the wheel bearing which is part of the axel hub Thanks Ray

Posted on Nov 10, 2009

tburtk
  • 158 Answers

SOURCE: i have a 2002 and front rear isnt working.

check the front axle actuator. make sure it is getting signal to actuate, but these actuators are notorious for problems. most likely the actuator is bad. it is on passenger side of differential/axle housing. plastic cylinder with wires.

Posted on Feb 16, 2010

Molson02536
  • 3854 Answers

SOURCE: 2003 Sierra 2500hd transmission or transfer case

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.

Posted on Mar 17, 2010

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1 Answer

Driver side axle leak


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movement where
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its a 3D world post directions.

btw, most seals that leak are due to bad bearings allowing the shaft
to beat the seal to bloody death, fact. (Timken.com)
only 1 exception, but is not where you are.

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You need to pull the Transfer Case & completely
disassemble it & rebuild it

There are kits for that

There is Video you can watch on
You Tube Video

There are several bearings
Rebuild yours ,do not install a
used unit from a salvage yard
it will be as bad as yours

Drivetrain.Com has great info on transfer cases

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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.

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If you are losing fluid and there is no sign of leaks then it can only be going to one of two places. Into the radiator, due to a faulty transmission cooler, or more likely into the transfer case due to a faulty input seal in the transfer case. To confirm if it is going into the radiator just remove the rad cap and look for ATF floating on the coolant. But ONLY DO THIS WHEN THE ENGINE IS COLD!!! You don't want to be sprayed with hot engine coolant. But the safer alternative would be to remove the transfer case fill-plug. If an excessive amount of ATF runs out then the input seal in the transfer case needs replacing.

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Loosing oil on the output shaft of the transfer case, I changed the seal two times it's still leaking.


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