[Can'tHave2MuchHP]

You have a useless dealer I must say...Common sense disappears in most service departments. Fixing the issue is never their concern it seems, they just want you to go away. Makes zero sense. I'd order you a new diff and swap it and see if that changes anything, if it does, you know the problem, faulty diff and warranty it. If it's not, likely could work a used part deal and lose minimally. Worth it for keeping such a customer.

Anyways, hope you get this sorted out. Keep us posted. I got on mine yesterday from 0 MPH and from a 50 roll and car drives straight as an arrow, zero wobble, perfectly planted.

How much is a new rear end/diff? Anybody have the part number?

[tomster]

Originally Posted by JANNETTYRACING

dealer did that no change when it was pulling left I don't know if they tried that now that it pulls right

so what changed that caused the pull to change directions?

[jjgi5150]

Hi all...

Watching this issue closely...and hoping for the best. l haven't experienced any of this...yet, and hoping l don't. l can say l believe that the 3.91/Torsen combo from my '15 Z/28 was a MUCH better setup....

JJ

[itsadryheat79]

I'm watching this thread closely - with over 10K miles on my ZL1 1LE I don't want it sitting in the dealership while they scratch their head. Been there done that many times - often I go to them with a informed warrantee fix request not a problem. Thanks to all that contribute here!!

[JANNETTYRACING]

Originally Posted by Can'tHave2MuchHP

You have a useless dealer I must say...Common sense disappears in most service departments. Fixing the issue is never their concern it seems, they just want you to go away. Makes zero sense. I'd order you a new diff and swap it and see if that changes anything, if it does, you know the problem, faulty diff and warranty it. If it's not, likely could work a used part deal and lose minimally. Worth it for keeping such a customer.

Anyways, hope you get this sorted out. Keep us posted. I got on mine yesterday from 0 MPH and from a 50 roll and car drives straight as an arrow, zero wobble, perfectly planted.

How much is a new rear end/diff? Anybody have the part number?

I have been involved every step of the way the dealers hands are tied by GM Tech reps and have to follow step by step process of elimination.

I am just venting my frustration as they won't take my word where to look for the problem.

If something is in the top drawer I don't care how hard you look in the bottom drawer you're not going to find it.

Ted.

[Can'tHave2MuchHP]

Originally Posted by JANNETTYRACING

I have been involved every step of the way the dealers hands are tied by GM Tech reps and have to follow step by step process of elimination.

I am just venting my frustration as they won't take my word where to look for the problem.

If something is in the top drawer I don't care how hard you look in the bottom drawer you're not going to find it.

Ted.

My whole family and I own GM dealers. You're getting the rule-book-run-around. Their hands are not tied, the dealer can choose to report whatever they want, and there should be a GM representative out there to verify within days of a reported issue. If that representative shows up and the dealer says "Faulty diff" you'll have a new one in days. Your problem is your dealer isn't saying "faulty diff" or anything it seems, they're just being given the go-around from GM reps who don't want to deal with it. I've had stuff like this before, the owner or general manager of the dealership should be going to bat for you, they know the numbers to the Chevy representatives and regional managers. That's where the real power comes from. They (Dealer executives) should be calling them, telling them they have a high profile customer with a big issue that needs to be resolved. Stuff will start to happen. Service managers are great and all but they usually are just "ok" at walking around and making sure the techs are meeting the labor hours. Not the greatest with communicating with GM.

[Johnny Camaro]

It must be the E dif because I couldn't find any convertible with the same problems, you know why ? Because they don't have the E dif, GM stated that it wouldn't fit in the verts !!
Ordering my new 2019 ZL1 vert.

[JANNETTYRACING]

Originally Posted by Can'tHave2MuchHP

My whole family and I own GM dealers. You're getting the rule-book-run-around. Their hands are not tied, the dealer can choose to report whatever they want, and there should be a GM representative out there to verify within days of a reported issue. If that representative shows up and the dealer says "Faulty diff" you'll have a new one in days. Your problem is your dealer isn't saying "faulty diff" or anything it seems, they're just being given the go-around from GM reps who don't want to deal with it. I've had stuff like this before, the owner or general manager of the dealership should be going to bat for you, they know the numbers to the Chevy representatives and regional managers. That's where the real power comes from. They (Dealer executives) should be calling them, telling them they have a high profile customer with a big issue that needs to be resolved. Stuff will start to happen. Service managers are great and all but they usually are just "ok" at walking around and making sure the techs are meeting the labor hours. Not the greatest with communicating with GM.

Thanks for your insight, I will put some pressure on my dealer.

Ted.

[Bill_76]

Originally Posted by Johnny Camaro

It must be the E dif because I couldn't find any convertible with the same problems, you know why ? Because they don't have the E dif, GM stated that it wouldn't fit in the verts !!
Ordering my new 2019 ZL1 vert.

2018 A10 and the same in situations under full throttle it moves the front to left, not a comfortable situation, I hope someone can get the solution

[JANNETTYRACING]

Originally Posted by Bill_76

2018 A10 and the same in situations under full throttle it moves the front to left, not a comfortable situation, I hope someone can get the solution

Mine goes right on mid throttle.

[rjacobs]

Originally Posted by Fraxum

I hope GM can help you. But I wonder if making the Ediff standard on the ZL1 was a good idea. I want that 40 pounds back. Most of us do not have skill or will ever learn to drive the ZL1 @ 8-9/10s on a race track to realize the benefit of the diff. The diff makes good sense on the ZLE

My theory is the SS diff is just as strong as the ZL1 version. What do you think Ted? If mine acts up after the warranty I would look into the SS diff.

The SS diff is WAY WAY smaller than the ZL1 diff. I also believe its 100% aluminum where as the ZL1 diff is nodular iron(at least the center section is). There is no way the SS differential is as strong as the ZL1 piece.

The actual ELSD portion of the diff is a small box that hangs off the back to command hydraulic fluid into the ELSD actuator. The ELSD does NOT add 40lbs to the car...the nodular iron center section that is WAY WAY beefier than the SS parts adds the weight.

AND I can almost guarantee without the ELSD present the car will obviously throw a bunch of error codes and the stabilitrak may or may not operate correctly since its missing the ability to control the rear diff.

[Mr. Wyndham]

Originally Posted by rjacobs

The SS diff is WAY WAY smaller than the ZL1 diff. I also believe its 100% aluminum where as the ZL1 diff is nodular iron(at least the center section is). There is no way the SS differential is as strong as the ZL1 piece.

The actual ELSD portion of the diff is a small box that hangs off the back to command hydraulic fluid into the ELSD actuator. The ELSD does NOT add 40lbs to the car...the nodular iron center section that is WAY WAY beefier than the SS parts adds the weight.

AND I can almost guarantee without the ELSD present the car will obviously throw a bunch of error codes and the stabilitrak may or may not operate correctly since its missing the ability to control the rear diff.

I agree.

One thought, though......someone clever might be able to convince the car it's a convertible...

[Stephen12ZL1]

Originally Posted by URBAN LEGEND

I would think the Christmas lights would light up fast. No?

sure...but it certainly will give some clues to if the e-diff is to blame

[waterman]

Originally Posted by Mr. Wyndham

I agree.

One thought, though......someone clever might be able to convince the car it's a convertible...

Following this thread closely.