Shuddering while braking?

LongrangeLauber · June 6, 2014

Don't run it at max torque only the second setting on my Ingersoll Rand which is about 125ish or so ft-lbs

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j-ten-ner · June 6, 2014

...Its not that you are using an impact gun, it is more that the lugs need to be torqued to an equal value. Ever since manufacturers started downsizing brake components to save weight, rotors have taken a beating. Wheels with un-equal torque on the lugs will create a warped rotor. Same for over torqued lugs...

x2

It is kinda scary what people do with their trucks w/o covering the basics.

Like installing leveling kids and/or lifting kids but fail to adjust the headlights.

Same with the new stereo and sub woofer.

Sounds good inside the car but from the out side it sounds like someone is beating a pop-can with a whisk.

so long

j-ten-ner

LongrangeLauber · June 10, 2014

I believe I have narrowed it down to my tires. I replaced front pads and nothing changed (didn't think it would). Check all bolts on front end components as well as the newly rebuilt rear just to be sure nothing came loose. I really noticed it when I was behind a tractor going about 20 mph and my truck felt like there were pits in the tires, it was a small up and down movement at a certain point in the tire.

Wondering if it has anything to do with the locker installed in the rear cause it always wants to lock both tires so the inside tire will always skip around a turn and I believe over time this is what caused an uneven wear in the tire (and I rotate every 5k miles religiously). Now that I think back to when this started around January, I got my gears and locker installed around October so about 6k miles and then it started to show. This is all just a shot in the dark but it makes sense to me

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Doug_Scott · June 10, 2014

When you say "locker" do you mean the optional G80 locking differential or an aftermarket differential? The G80 will not normally engage until you actually have wheel spin. That being said, on my 2010 with 4:10 gears and G80 will give a light squeal on left hand and right hand 90 degree turns from a dead stop. I can make it stop by simply lifting a bit. This happens mostly on hot days and on roads that have not seen rain for more than a week. It is not due to the locker in my case. If I try to make it squeal in those cases, it will spin both wheels for just a very short time till traction control kicks in.

Don't see how this could give any funny wear on a tire though(other than more tire wear than others). If you are getting wheel hop, that would give odd wear pattern, but, if you are getting wheel hop, the last parts you need to be concerned about are the tires.

If you rotate the tires, does the shudder change? Or are all your tires in the same condition? If tires still have lots of tread on them, I would try to locate a friend that has the same size wheels and tires that would fit your truck, and try to arrange a tire/wheel swap to test for vibration change. I am not a fan of guessing and then tossing money at it, hoping I guessed correctly. It is not that I do not have faith in my "guesses"(after all, they are (educated guesses), it is more that I am a cheap bastard.

LongrangeLauber · June 10, 2014

When you say "locker" do you mean the optional G80 locking differential or an aftermarket differential? The G80 will not normally engage until you actually have wheel spin. That being said, on my 2010 with 4:10 gears and G80 will give a light squeal on left hand and right hand 90 degree turns from a dead stop. I can make it stop by simply lifting a bit. This happens mostly on hot days and on roads that have not seen rain for more than a week. It is not due to the locker in my case. If I try to make it squeal in those cases, it will spin both wheels for just a very short time till traction control kicks in.

Don't see how this could give any funny wear on a tire though(other than more tire wear than others). If you are getting wheel hop, that would give odd wear pattern, but, if you are getting wheel hop, the last parts you need to be concerned about are the tires.

If you rotate the tires, does the shudder change? Or are all your tires in the same condition? If tires still have lots of tread on them, I would try to locate a friend that has the same size wheels and tires that would fit your truck, and try to arrange a tire/wheel swap to test for vibration change. I am not a fan of guessing and then tossing money at it, hoping I guessed correctly. It is not that I do not have faith in my "guesses"(after all, they are (educated guesses), it is more that I am a cheap bastard.

It's an aftermarket locker. Yukon Grizzly locker to be exact. Wet or dry it is engaged in a turn and you can really notice it's locked in while making a turn from a dead stop. All tires in same condition bought them when I installed lift a while back. And my buddies neighbor has the same truck as me so when he gets back from PA I'm gonna see if he can swap with me just for like 30 min. cause I'm sure I will feel it by then. Actually I'll probably feel it first time I hit the brakes. I wasn't going to buy new tires until I tried another set out. I can't afford to toss $1600 out the window right now lol

I was going to rotate tires today. It's been on my list since last week but I've been too lazy haha

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Doug_Scott · June 10, 2014

For whatever reason, Yukon does not show a breakdown for their locker differential. They make it sound like it behaves like a Detroit locker in some places, and in other places they make it sound like the GM G80. Either way, it should not be locked up unless one wheel is turning significantly faster than the other wheel(I don't mean 20mph difference, I mean more than turning radius difference between inside and outside wheel).

Just one thing that I don't think has been addressed. Don't even know if it is a 4wd truck, but, are you sure you are not in 4 wheel drive mode? Driving a truck that is in 4 wheel drive on dry roads will give some strange vibrations. Generally the vibrations get worse the farther you drive without driving on shoulder of the road or a gravel/dirt section of the road. Going off road allows the wheels to operate at different speeds by slipping on dirt roads. On pavement, all that speed difference gets applied to the chassis, twisting it up, until it can force a wheel to start slipping to unload the chassis. Something to look into.

LongrangeLauber · June 10, 2014

Not in 4wd. I can engage 4wd and hear the actuator kick in and then when I put it in 2wd you can hear the actuator kick it back out. From what I can tell while owning this locker is it stays engaged until it comes to a turn and then it sounds like it doesn't want to disengage. Weirdest thing

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Doug_Scott · June 10, 2014

I don't have a 4wd, and have not been in one in years, but, back in the day, 4wd trucks had a neutral position in the 4wd shift quadrant. Does your truck have a neutral position in the 4wd shifter? If truck in shifted into Neutral on the 4wd shifter, and you park the truck, leaving it in Park, does the truck still roll?

Reason for asking is because I want you to try something. If you do have a neutral position in the 4wd shifter, and if you shift into neutral while parked, the truck will roll like it is not in Park, then while driving at speeds where you can create the shudder, shift transfer case into neutral and see if the shudder still happens. What this does is either show the shudder is in drivetrain or not.

If you do not have a neutral position on the 4wd shifter, then as Emily Litella would say, "never mind".

LongrangeLauber · June 10, 2014

I have an electronic switch on the dash. Only neutral I have is in the tranny. Shifting into 4wd low my truck has to go into neutral in order for it to go into 4LO

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Doug_Scott · June 10, 2014

Ok, that won't work then. Not even sure if the manual transfer cases even have a neutral position anymore. They did way back when, they also had locking hubs then too, so you could completely take the front drivetrain offline. You weren't driving the front diff and driveshaft from the front wheels when in 2wd. Locking hubs disconnected the front wheel from the front axle.

LongrangeLauber · June 10, 2014

Yeah I've worked on my buddies 99 f 250. I'll keep my ifs setup so much easier IMO to work on until you gotta get the front diff rebuilt

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LongrangeLauber · June 11, 2014

Ok rotated the tires yesterday and it definitely changed it but it still shakes just a bit. It's tolerable now but I guess this means I have to rotate my tires more often. Like every 3k miles cause I normally do it every 5k

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00Silverado4x4 · June 11, 2014

Do you have pics of what your "rear" tires look like. I'm kind of curious to see the tread wear. If your locker is not disengaging on turns then I'd imagine your tires are going to continue to get chewed up pretty bad.

LongrangeLauber · June 11, 2014

Do you have pics of what your "rear" tires look like. I'm kind of curious to see the tread wear. If your locker is not disengaging on turns then I'd imagine your tires are going to continue to get chewed up pretty bad.

It disengages it just keeps trying to re-engage. You can hear the tire slipping. I don't think a picture could show the tread wear. It's every other lug in the pattern that it's worn down but just barely. Not sure how this is causing my issues though

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