06' 2500HD rear end slippage maybe??

KAVEMAN · December 3, 2006

Don't worry, i did try and search this several different ways before posting this new topic without any results.

Anyways, I have a 2006 GMC Sierra 2500HD 4x4 6.0L Reg Cab W/T LB with 4.10's. I bought it new and Ive had it for about a month and a half now. I had installed the green key lift kit with new shocks and 315/70/17BFG's the day after i bought it. I havent reset the speedometer or the shift points. I know due to the bigger tire size that the mileage will be affected but the odometer reads 1,953 miles as of now. My problem is, every now and then when I stop, I press the accelerator to proceed forward and the rpm's rise and i can feel the truck trying to go forward and then all of a sudden it kinda catches like and then everything is fine. It doesnt do it everytime though when i stop. Is it possible for the clutches in a rear end to slip? It doesnt feel like it is the transmission. It feels more like the rear end. Could this be a result of anything out of alignment from the lift? Thanks for the help

KAVEMAN · December 6, 2006

7 seconds is alot shorter than 120 seconds definetly!! Mine did it 3 times in 1 day about 2 days ago so I dont know whats going on either. Once i press the gas and the rpm's rise, it doesnt usually last but about 3 seconds before mine "cathches" again and then i start to go again. Oh well, Ill just drive it. Thanks for the help.

KAVEMAN · December 5, 2006

Dang! 120 seconds is a long time! I'd sure hope I would have realized something was wrong before then as well. Thanks for the help. I guess its just aggravating when you buy a NEW vehicle and arent expecting to already start having problems out of it.

Ranger · December 4, 2006

I also got that feeling sometimes. Not sure how it could be the limited slip as I had a G80 in the Colorado and it never did that. When it stopped, it stopped. The G80s in HDs could be different as it's a different rear end.

KAVEMAN · December 4, 2006

It just seems weird to me. It's hard to explain on here without someone riding with you that's a mechanic when it does it. It's not like the gears are slipping in the rear end because i know i would surely feel that and hear that, but like it takes a single revolution of the rear end to turn over when it happens before something catches and falls back into place and then starts working properly again. It's just hard to explain.

GM-Tech · December 4, 2006

This sounds like a trans problem not a rear end. Never seen one act like that.

GM-Tech · December 6, 2006

Dang! 120 seconds is a long time!

Yeah, and totally inaccurate. I must have been thinking of some other problem because I just looked up the slip code and it said 7 seconds. Sorry for the misleading information first time around.

dhansell22 · December 6, 2006

I've had the same thing happen in my '05 1500 3 times in the last month and a half. At first I just figured I was spinning the tires because it was wet but it happened again today with dry conditions. I just hit 36k so no warranty for me. If it won't set a code untill 7 seconds and it is totally random then what should be done? Tranny fluid is full and looks good. Is this one of those wait till it blows up things? By the way, I thought it was the rear end too.

wrecker03 · December 4, 2006

I have the same situation in my 2005 2500HD. What I have been told is that it IS the rear end and that it is completely normal. Seems odd to me, but that is what I've been told. If I remember correctly it has to do with the limited slip in the rear end. I'm not a mechanic by any means so this could be bad information but if this is incorrect I'd also like to know if there is a fix. I only have about 10K worth of warrenty left.

KAVEMAN · December 5, 2006

If the transmission has slipped then, will the computer in the truck keep track of the slippage and store it if I took it to the dealer and they hooked it up to a machine or something?

GM-Tech · December 5, 2006

If the transmission has slipped then, will the computer in the truck keep track of the slippage and store it if I took it to the dealer and they hooked it up to a machine or something?

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Slippage has to occur for a extended length of time (120 seconds?) for the computer to decide there's something going on and set a code.

The technician will need to drive the vehicle and experience the condition to diagnose it in most cases.