roadtrip120

FYI to everyone that has been waiting like myself.

Motive C6Z Gears 3.90 and 4.11 are in stock and ready to ship.

I called Motive to ask about ETA and they said both in stock but have to buy from a retailer like Jegs or Summit.
I ordered mine today trough Jegs for $640 Shipped No Tax


Motive Part numbers
VZ 887390 = 3.90
VZ 887411 = 4.11


I told Jegs to add them to the website as others would be calling soon. They had to call Motive and add the part number to their system. They are supposed to drop ship on Monday. Good thing I already have the Getrag Z06 Pinion Depth from Kent-Moore DT-48009 to set them up.

See you boys at the track!!

Apocolipse

You better not be fking around...

double06

Good news took a while I guess need to update other thread on this.

roadtrip120

Completely serious

Jegs PT is 683-VZ887390

blkscls1z

Called Summit and they didn't have it in the system yet. Rep has my number and will call back on Monday after checking with Motive.

roadtrip120

dubaitacker

yep they are selling them

Dan_the_C5_Man

My Jegs order is in. I can only hope You-Know-Who isn't going to try and f*ck us by snatching up the entire inventory.

The second opportunity to get boned is we are buying version 1.000 of this product - I can only hope that Motive has learned their lessons from previous failures around surface treatments, etc. I'm going to have mine polished in any case.

Who needs a cam now? Not I..

Mike44665

Thanks.

Just when I ready to jump on it, I now remember my purchase of a 2011 Duramax. Big horsepower with the new DEF system. Getting stuck 700 miles from home wasn't fun and that was one of a few. I may wait.

Josh B.

Good to know they're available.

427V8BB

do yoyu need anything else to install them is it hard? do you need to shave down or cut anything yourself? does this make your rear end weaker? how badly would fuel economy get. and how much would it help drag racing and roll racing? thanks in advance

jayyyw

Who has a write-up on installation??

Apocolipse

Are they selling it as a 4.11?

corvettenutz

I put 3.91's in my 15 camaro ss. made a diff but not what i expected.

slammin86

What do the 4.11's do for max mph in each gear on a Z06?

jayyyw

1st Gear
2.66 -> 50.86mph

2nd Gear
1.78 -> 76mph

3rd Gear
1.30 -> 104.07mph

4th Gear
1.00 -> 135.29mph

5th Gear
.74 -> 182.82mph

6th Gear
.50 -> 270.57mph

4.11 with stock size tire

jayyyw

3.90 with 275/50/15 and a 7500rpm shift point.

1st Gear
2.66 -> 55.49mph

2nd Gear
1.78 -> 82.92mph

3rd Gear
1.30 -> 113.54mph

4th Gear
1.00 -> 147.61mph

Crossing the trap at 7150rpm assuming a 140mph trap speed.

MikeOC

https://xse.com/leres/z06/calculator.html

Dan_the_C5_Man

You should send the diff out and have them set up professionally - there is an art to seting the lash properly, the first time, as well as specialized tools.

Mike44665

And that's why I put 4.88's in my 69 Z/28, now that was an improvement let me tell ya! Gas was 35.9 a gallon for high octane, I was making $121.00 a week and buying tires as well.

First gear was 2.20, with a 4.88, 7.08

First gear is 2.66, with a 4.11, 6.77, with traction control this will make traffic lights almost like a thing in my past.