[Z06] Feels like the diff is gone
Thread Starter
Race Director
Joined: Oct 1999
Posts: 11,540
Likes: 115
From: Arlington TX
Feels like the diff is gone
Car is jacking on the rear when backing and turning and making noises. 12k miles. Well it was only time till I took it in glad I waited for one more thing to come up and save an extra trip to the dealer.
Now get to have them fix:
reverse lockout doesn't work about 25% of the time
notchy shifter, twice as hard as my previous C5 to shift
ripping seat cover (I only weigh 160)
drivers seat keeps reclining itself
rattling passenger seat belt
violent wheel hop
"charge system fault" displayed on DIC more frequently
This is more problems than I had with my 2000 FRC in 40k miles.
Now get to have them fix:
reverse lockout doesn't work about 25% of the time
notchy shifter, twice as hard as my previous C5 to shift
ripping seat cover (I only weigh 160)
drivers seat keeps reclining itself
rattling passenger seat belt
violent wheel hop
"charge system fault" displayed on DIC more frequently
This is more problems than I had with my 2000 FRC in 40k miles.
Burning Brakes
Joined: Jun 2004
Posts: 1,240
Likes: 2
From: Cedar Rapids Iowa
Your profile does not say where you live, but if it is up north then note the following. When there is ice and snow on the road or even if it is very cold, my rear end makes popping noises when I turn hard. I believe it is the tires slipping because the limited slip clutches are not totally releasing. Same thing on the wheel hop. When the weather turned very cold, my rear wheels hop like crazy when I floor it in first. Neither of these things happened when the temperature was warmer.
Team Owner
Joined: Mar 2001
Posts: 25,889
Likes: 7
From: Virginia Beach
CI 3-5-6-7-8 Veteran
Some minor Popping is "normal" when cold... it's the limited slip clutches. It can alsot be the nut at the end of the half saft holding the hub on. Remove the wheel, remove the big **** nut, re-lube, then re-torque to spec.
Wheel hop is just the nature of IRS when it's cold... cold tires + cold road + power = hopping like a raped rabbit. Do a nice burnout to get the tires sticky and you'll see there's less of it, but it won't be gone... and it's not something the GM dealer can "fix"
As for the reverse lockout... they're not 100%, they're not supposed to me. If you push hard enough on them they're overridable (sp?) it's a feature built into them so you can get the car into reverse if you have to. If it's happening in normal driving or even racing you may have an issue. If it's happening when you powershift into 5th then you need to watch how you shift.
As for the seats.... call Ken King at Vetteessentials!
Are you sure the passenger seat belt just ins't rattling against the door/trim? Try buckling it when driving and check that out.
Wheel hop is just the nature of IRS when it's cold... cold tires + cold road + power = hopping like a raped rabbit. Do a nice burnout to get the tires sticky and you'll see there's less of it, but it won't be gone... and it's not something the GM dealer can "fix"
As for the reverse lockout... they're not 100%, they're not supposed to me. If you push hard enough on them they're overridable (sp?) it's a feature built into them so you can get the car into reverse if you have to. If it's happening in normal driving or even racing you may have an issue. If it's happening when you powershift into 5th then you need to watch how you shift.
As for the seats.... call Ken King at Vetteessentials!
Are you sure the passenger seat belt just ins't rattling against the door/trim? Try buckling it when driving and check that out.
Drifting
Joined: Jul 2004
Posts: 1,756
Likes: 6
From: Gulf of Mexico Florida West Coast
Cobra4b
Thanks for the info. you answered my concerns on my cars behavior. I know there is tremendous engineering applied here in way of design, but I do not have enough experience grasp its cause and effect. Of course temp. is a major influence, but now I understand its behavior on the C5. I am no longer contemplating a dealership visit. You are right I never had these conditions when it was warmer. 
Hopefully this helps out others as well!
Hopefully this helps out others as well!
Thread Starter
Race Director
Joined: Oct 1999
Posts: 11,540
Likes: 115
From: Arlington TX
I live in Texas and it was in the 60s when it started making noise and it is not a minor normal limited slip noise. When I drove it to the dealer today I think it may be a cv joint, which may explain the nasty noise I hear that sounds like something broke with the slightest wheel hop. And the wheel hop happens any condition that I spin the tires, hot/cold wet or dry.
Reverse lockout better be 100% under normal shifting force my '00 that I had before this one worked 100% of the time. Mine just decides not to work and it slides over to the reverse gate just as easily as sitting still. It is a pain to get in 5th when the lockout isn't working.
Yes the seat belt is just rattling against the trim, I want them to fix, do something I get tired of having to always buckle the seat belt when noone is in the car.
Reverse lockout better be 100% under normal shifting force my '00 that I had before this one worked 100% of the time. Mine just decides not to work and it slides over to the reverse gate just as easily as sitting still. It is a pain to get in 5th when the lockout isn't working.
Yes the seat belt is just rattling against the trim, I want them to fix, do something I get tired of having to always buckle the seat belt when noone is in the car.
Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
Originally Posted by rgregory
Car is jacking on the rear when backing and turning and making noises. 12k miles.
I believe the spec for the diff is 75 ft-lbs. Way to check whether the limited slip action of the diff is working is to jack one rear tire, take the car out of gear and release the parking brake, put a torque wrench on the axle and see how much torque it takes to turn the wheel. I believe it should be at least 75 ft-lbs. If it is less than that, your diff's isn't acting as a limited slip as well as it should. Less limited slip maybe...
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