Question about 2006 GMC Sierra 2500HD 2WD
Could be a problem vacuum hose for the shift accuator or simply dirty oil needing a transmission oil change
Posted on May 18, 2017
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Posted on Jan 02, 2017
I have found that when you are going to engauge 4x4 high, it is best to only be going about 3 miles an hour. Not faster, not stopped. It likes some movement to help it mesh. I've had perfect shifts since I started this. Hope it helps. Wade.
Posted on Jan 27, 2009
check with dealer i had the same truck and as i remember there was a recall on them having to do with the shift indicator or something
Posted on Feb 06, 2009
SOURCE: '03 GMC 2500HD 4x4 problems
Take your positive cable off battery and wait a few minutes..This resets the computer and takes it out of limp mode.Theres been a lot of problems in the dash so if you can find an auto zone and have them scan it They'll do it for free.But as far as the lights my truck does the same thing. Just flick your fingers on the buttons and they should flash..The plug in the back of buttons was loose..
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Posted on Mar 29, 2009
SOURCE: 2001 Chevy 2500HD Whining
these transmissions have three sets of planatery gears the whining you hear is simply the gears doing thier job. You have to remember the allison trans is basically the scaled down version of the heavy duty isuzu truck trans they are designed more for thier load capacity then for comfort
Posted on May 10, 2009
Make sure you have the proper amount of tranny fluild in it and get that Valvoline fluid out of it. Allison transmissons have there own type of tranny fluid and you want to use it. You can buy the right stuff from a Allison dealer. Most Detroit Diesel dealers are also Allison dealers. Look them up in your phone book and they will tell you the quanity and sell you five gallon pails of the fluid. Just get the serial number off of the side of the transmisson before you call. Change the fliters again too. Believe me, this is important. My company has Yard horses with Allison transmissions and you don't want to screw with the small stuff. Service them right and they work as hard as you want.
Posted on Aug 09, 2009
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