My 06 4x4 has 285/70/17s. No lift but I did crank the t-bars a turn and a half, but I've never rubbed. They are open county at's. I assume you will need to crank the t-bars a little on a 2 wheel drive
Codes like that come from the O2 sensors readings. You can have the computer programmed not to show those codes, but if you in a state or county that tests emissions you are not going to pass. It might be cheaper to put it back to stock than getting a tune to not show the codes. But the tune is more fun lol.
Brian715 replied to Jager311's topic in Gen III and IV Small Block & DrivetrainI sometimes track misfires and whatnot with an ELM327 wifi OBD2 scanner and the torque pro app on my phone. You can see live data of a lot of sensors and help narrow down the issue. 500 RPM seems a little low, I think my 06 idles around 600 or so. No aftermarket cam or anything?
Brian715 replied to whoy2002's topic in 2000-2014 Silverado & Sierra HDHmm... definitely sounds like a wiring/electrical issue. https://www.cargurus.com/Cars/Discussion-t14492_ds509834 take a look at this post.
If that is indeed what it is, a rebuild is in order. If you feel confident in removal of the Tcase, there are a few YouTube videos that show the process of the rebuild. It's not super complicated IMO. Might be worth trying to find a junkyard or used one if you aren't confident on the rebuild, and then it's just a matter of remove and replace.
What kind of sound does it make that makes you think it is engaging? Does the front driveshaft spin when engaged? This could narrow it down to an issue in the front end and not the Tcase. If the front driveshaft doesn't spin, then your issue is in the Tcase or the solenoid that shifts the Tcase. Also maybe get it on a lift or jack stands if possible to easily see if the wheels spin
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