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Chevy Silverado and GMC Sierra 4x4 Questions

233 messages,  Last post on Nov 08, 2009 at 11:21 PM

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What is this discussion about? Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Truck

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#123 of 233 2005 GMC Sierra stuck in 4 wheel low by nardi1 Nov 12, 2008 (5:57 pm)
#124 of 233 2005 GMC Sierra stuck in 4 wheel low by nardi1 Nov 12, 2008 (5:57 pm)
My GMC is shifting itself into 4 wheel low and wont shift out. Its push button 4wd. If I shut the truck off for 10 minutes and restart it, it goes back into 2wd by itself. I talked to a local mechanic and he had no ideas other than to pull the fuse so it wont shift. This has been fine for the summer but winter is coming and I'd like to get this fixed. Any ideas?
#125 of 233 LT245 tire pressure by tafid Nov 26, 2008 (5:54 pm)
I have a Silverado 1500 4X2. There are LT245 70R 17 tire on it. Max pressure is 60 psi. The message board says check tire pressure. Question is can you run at recommended pressure (about 35 psi) under normal running (no load), but inflate to higher pressure when loading heavy cargo?     Replies to this message: obyone (Nov 27, 2008 1:38 am) tafid (Nov 30, 2008 11:45 am) obyone (Nov 30, 2008 1:37 pm)
#126 of 233 Re: LT245 tire pressure [tafid] by obyone Nov 27, 2008 (1:38 am)
Replying to: tafid (Nov 26, 2008 5:54 pm) that is exactly what you should be doing. Replies to this message: tafid (Nov 30, 2008 11:45 am) obyone (Nov 30, 2008 1:37 pm)
#127 of 233 Re: LT245 tire pressure [obyone] by tafid Nov 30, 2008 (11:45 am)
Replying to: obyone (Nov 27, 2008 1:38 am) Thanks, but the lower psi is 45 psi for LT tires. My door label wants the Silverado LT 1500 to run 'P' not 'LT' tires. This says it will be 35 psi max, which is where I should be. My lesson learned, do more homework before buying.     Replies to this message: obyone (Nov 30, 2008 1:37 pm)
#128 of 233 Re: LT245 tire pressure [tafid] by obyone Nov 30, 2008 (1:37 pm)
Replying to: tafid (Nov 30, 2008 11:45 am) The P or passenger tire like the Michelin LTX M/S has a max psi of 35#. Being a passenger tire 30-35# will give you the best ride. However, running LT tires which are designed to be installed on the 2500 and 3500HD with more belts and a stiffer sidewall should have no problem running at 38-40# with no load on a half ton truck. I can imagine your ride at 45 psi.
#129 of 233 04 Sierra 2500HD, Front End Growl/Grind in 4Hi/Lo by pkeagle Nov 30, 2008 (7:35 pm)
Facts: *There is a Growl/Grind coming from the front driver side as far as I can tell. *Noise is present during deceleration 30mph and under. *Noise can not be heard during acceleration. *Noise exists while coasting in neutral as well. *There are no visible leaks anywhere? *Noise is amplified while turning. *Noise goes away after shifting back into 2WD. *There seems to be no issues shifting into and out of 4WD Hi or Lo. *Tire wear is consistent and even. *Front inside brake pads are not engaging rotor on either front wheel.   Actions: *Changed out front differential gear oil. Drained a purplish, thick oil w/ what looked like metal flakes/sparkles. Magnetic drain plug had a few small splinters. (<1/8") Refilled w/ Valvoline 80W90 Synthetic Gear Oil - Noise still there. *Local performance shop seems to think it might be a wheel/hub bearing assy. If a bearing, would the noise be consistent during accel and decel in 2WD or 4WD? So I have my doubts about this being the issue. Questions: *Does the front differential disengage during decel or is it engaged all the time in 4WD? *If it does disengage, what controls this? Front Axle Shift Motor? *What do I look for to tell if it is a CV Joint? *Any suggsestions or help is appreciated!!! Replies to this message: dans04z71 (Dec 07, 2008 12:40 pm) bruce48532 (Dec 08, 2008 8:01 am) dans04z71 (Dec 08, 2008 4:36 pm) and 6 more...
#130 of 233 Re: 04 Sierra 2500HD, Front End Growl/Grind in 4Hi/Lo [pkeagle] by dans04z71 Dec 07, 2008 (12:40 pm)
Replying to: pkeagle (Nov 30, 2008 7:35 pm) I to am having this exact same problem. I took mine to a shop and they told me it was the clutches in the transfer case. As for the CV joints i dont think it would be those because you would still hear them no matter what. If you find anything out let me know. Replies to this message: bruce48532 (Dec 08, 2008 8:01 am) dans04z71 (Dec 08, 2008 4:36 pm) bruce48532 (Dec 13, 2008 4:15 pm) and 5 more...
#131 of 233 Re: 04 Sierra 2500HD, Front End Growl/Grind in 4Hi/Lo [dans04z71] by bruce48532 Dec 08, 2008 (8:01 am)
Replying to: dans04z71 (Dec 07, 2008 12:40 pm) I think it is the cluches in the transfer case, I just rebuild the transfer case and notice just today the growling were as before I rebuilt it and the 4wd was not working you did not hear the noise. Replies to this message: dans04z71 (Dec 08, 2008 4:36 pm) bruce48532 (Dec 13, 2008 4:15 pm) dans04z71 (Dec 14, 2008 11:25 am) and 4 more...
#132 of 233 Re: 04 Sierra 2500HD, Front End Growl/Grind in 4Hi/Lo [bruce48532] by dans04z71 Dec 08, 2008 (4:36 pm)
Replying to: bruce48532 (Dec 08, 2008 8:01 am) So that fixed it then you hear no more growling in it or do you? how much did it cost you to rebuild it? Replies to this message: bruce48532 (Dec 13, 2008 4:15 pm) dans04z71 (Dec 14, 2008 11:25 am) bruce48532 (Dec 15, 2008 6:25 am) and 3 more...

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