Question about 2005 GMC Sierra 2500HD 4WD

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My 2005 GMC 2500 HD 4X4 front differential doesn't seem to release on tight turns. Seems to hop and skip on when in 4 wheel drive

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Owner's manual, troubleshooting? probably an electrical control problem in the differential.

Posted on Mar 04, 2015

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2 Answers

I drove it with the 4 wheel drive on dry pavement for a long while and my mileage has gotten poor,what could have gotten damaged from my mistake?


The only problem using 4x4 on dry pavement that may develop is with the front differential/axles. It will have no adverse affect on fuel mileage when the 4x4 is disengaged. Fuel economy will be affected if running in 4x4

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Can a bad deferential cause steering issue on 2002 envoy


I am assuming your mechanic was refering to the front differential and your vehicle is 4x4. If the vehicle is in 4x4 all the time you may notice a " hopping " feeling on corners from the front wheels. Otherwise, the differential should not cause steering issues. What type of problem is the vehicle experiencing that concerns you and would lead your mechanic to assess a bad diff?

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I have a 2004 Jeep Grand Cherokee Laredo and it runs great except for when I put it into part-time 4X4 or full time 4X4 and try to turn. When it is in 4 wheel drive it hops quite a bit when turning...


in part time it will for sure hop on dry surfaces. full time it should not. all 4 tires same size and equal wear?? they should be within 1/8 inch diameter of each other all 4. check with a tape measure around the circumference. if not you are going to break something sooner or later driving it like that.

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Check the oil in the transfer case. If it has lots of metal in it... time for a new one. They aren't the world's strongest.
Another check: Lift the front of the truck, while keeping the rear wheels on the ground. Engage the 4x4 switch (then turn the truck off) crawl under and try to turn the front driveshaft by hand. If it turns and the wheels turn, the transfer case is the problem if it turns but the front wheels don't... front diff issues. Any grinding, crunching etc is also a clue.

Dec 30, 2013 | Chevrolet Cars & Trucks

1 Answer

Hello, when i put my 01 dodge ram into 4 wheel drive it kind of hops along when you turn the wheel. is this normal of a 4x4 to do. if not could you please tell me what you think it might be.


This is normal, as most 4x4s do not have a center differential. This will cause the wheels to try and spin at the same speed front to rear and as the front wheels will cover more ground than the rear wheels in a turn, they will drag a little bit. I highly do not recommend using 4 wheel drive on pavement due to this, as it will eventually damage the front differential and will drastically accelerate tire wear.

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1 Answer

When I engage the four wheel drive the transfer case shifts over like it should but it seems like the front differential is not fully locking. with the trucks on jackstands the front wheels will turn but...


there was a tsb on loss of 4x4 electrical A flashing 4X4 lamp and/or a intermittent or loss of power windows, interior lights, rear wiper, or 4x4 system. the loss of 4x4 system was from a module.

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1 Answer

When i have my truck in 4 wheel drive and turn sharp it kinda bounces but when i have it in 2 it doesn't do that and i just want to know why....


The front differential/drive train have no way to slip in four wheel drive. When you make a tight turn the the front wheels travel a different distance than the rear wheels. on snow, ice, mud, or other off road conditions this isn't a problem because there is less friction for the tires and they just slip a little without much indication they are doing so. On dry pavement they cannot slip and cause the front drive train to bind up and eventually hop.

By the way that is not very good for the 4X4 drive train in general so unless you driving a straight line on dry pavement I wouldn't recommend using the 4x4.

In two wheel drive the front drive drain can move independent of the rear drive train so tight turns are not a problem.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

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1 Answer

2005 GMC 4x4 HD 2500 6.0 eng. rear axel seal


SEAL COULD BE LEAKING CAUSE YOU DIDNT LUBRICATE THE SEAL LIPS WITH PETROLEUM JELLY TO HELP THE THE SEAL LIP SEAL OR YOU DAMAGE THE SEAL WHILE DRIVING IT IN.AXLE FLANGE NUTS TORQUE IS 58 FT LBS THE AXLE HUB NUT TORQUE IS 177 FT LBS.

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check the vaccume module on the front axel it my have come un pluged or the electric connector hope this helps

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