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Rear end problem

texmln

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texmln Enthusiast

texmln

Posted
Posted

I have a 2007 Z71 4x4 Suburban with 110k on it. For the last 10k miles I've had what feels like a rear-end slipping/locking problem that has progressively gotten worse. It feels almost exactly like rear tires slipping briefly on wet pavement before catching except it happens only on dry pavement when accelerating from a stop in a straight line with moderate or hard power. If I baby it off the line it won't happen. The rear tires feel like they spin (but the tires are NOT actually breaking loose) and then there is a clunk and the rear-end seems to catch and accelerate normally from there. There is no noise when driving and, other than a minor clunk, there is no noise from the rear-end when it happens. All other driving is normal and trouble free.

 

Is my G80 simply locking in this situation when it shouldn't be or is this something else? If it is locking it isn't for long since I have no trouble cornering or making turns shortly after it happens. I checked my u-joints when it first started happening and there is no play in them - they seemed fine.

 

I appreciate any insight you can give me into this.

txab Senior Enthusiast

txab

Posted
Posted

Don't discount the transmission too soon. The slip feel can basically only come from your trans, unless your tires are spinning. Nothing to slip in the rear end. This problem has been talked of on here before. We had the same problem in about a dozen 4L60E transmission in our fleet. We increased the line pressure and the problem disappeared

LURCH HD Enthusiast

LURCH HD

Posted
Posted

If it has the tow haul mode you should be able to in gauge it and that raises the line pressure doesn't it. That should fix the problem and then you would know.

W/T_Deluxe Enthusiast

W/T_Deluxe

Posted
Posted

+1 on the trans slipping. since your experiencing it off the line, I would say its your 1-2 shift. Pull your trans dipstick, if the fluid looks real dirty, and smells burnt that will tell you right there.

texmln Enthusiast

texmln

Posted
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Posted

Guys, I appreciate the advice so far. To try and check out the trans angle I put it in 1 and hit it off the line - had the same issue. I also tried it in 2 and had a much lighter response, so torque is a big factor. Based on how it felt, I'm kind of leaning towards u-joints again. It doesn't feel like a slip so much as it feels like something winding, binding and then letting go. I'm going to get under it and recheck all the u-joints. I'll let you know what I find.

W/T_Deluxe Enthusiast

W/T_Deluxe

Posted
Posted

Do you notice any vibrations while driving? Thats a good indication of a u-joint problem. Pull the driveshaft and check how freely the u-joints move. If they are stiff time for a change

W/T_Deluxe Enthusiast

W/T_Deluxe

Posted
Posted

Depends if it really is slipping, sounds like something else is going on judging buy what the op is saying in his last post

 

Depends if it really is slipping, sounds like something else is going on judging buy what the op is saying in his last post

 

Depends if it really is slipping, sounds like something else is going on judging buy what the op is saying in his last post

 

Depends if it really is slipping, sounds like something else is going on judging buy what the op is saying in his last post

W/T_Deluxe Enthusiast

W/T_Deluxe

Posted
Posted

Also check your yoke on the rear end I've seen them come loose and cause the problems similar to the "binding" your experiencing. Oh and sorry for odd post my phone must have messed up

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