This is my first post on this forum however I have gotten a lot of good info before with some previous issue's ive had. I have a 2003 2500HD LB7 4x4 ccsb. Yesterday I was taking off down the road not putting my foot in it but just a little to get to speed. At about 40-45 mph there was a buck as if it slammed into gear, i thought i heard a hissing sound but it lasted only a second if that. Then the abs/break/and check engine lights all came on and the speedo started fluctuating randomly. Ive had this truck over a year w/ approx 294,XXX miles. I replaced the entire Right wheel hub assembly and wheel speed sensor about 9 months ago, u-joints about 6 mths ago, rebuilt transfer case about 6 mths ago, NSBU and PSM replaced roughly 4 mths ago, and replaced the Left wheel speed sensor today. It will throw the abs/brake lights randomly, it goes into limp mode, shut the truck down and restart or cycle the key a few times and it seems to fix it for a few mins then hops into limp again. I have the hypertech max energy programmer, mild exhaust mods, 33's w/ the hypertech tuned in for the tires. Occasionally ill have a loud clunk that sounds like its coming from the rear-end when going from park to D or any other gears really. but its intermittent, i checked the rear end earlier and added a little gear oil. Normally runs perfectly besides needing the injectors changed(starts white smoking while idling) but pulls like it should, no other issues. Really is a good truck, just trying to keep it on the road. My thoughts are that it may be the rear output speed sensor?
Any Help would be greatly appreciated.
Any Help would be greatly appreciated.
