Bill Curlee

Im in the process of doing all these up-grades and this post is a GOLD MINE of knowledge.

I disassembled my rear and this is the ONLY damage that I found:





The long shaft spring was broken and the clutch pack was not as effective as it should have been.



I also ordered the DTE spider gear cross shaft. Heres the difference between stock and the DTE shaft:



It looks like it heavy duty.

Bill

Bob K

Great write up!!!!

Just one question.

Is the lubricant (in the glass) in the second picture a particular brand or can I use whatever I have on hand?

Bob K.

Corvette Don

Anyone have part numbers for the RH C6 Z06 shaft and the upgraded C6 z06 pinion support? I bought a older DTE Stg 2 rear end but the RH shaft is stock, so if its cheap enough I might as well replace it.

Bill Curlee

I was discussing my rearend up-grade with a close friend and he stated that the Left and Right clutch housing need to be reassembed in the same location that it came apart.

If you look at the recess that the long shaft housing fits into, you can see the housing outline marks that it needs to match up to. Just a point that I failed to take into account and many others may also.

I love this post! It gave me the guts to rip the rearend apart.

Its_Go_Time

THANK YOU AGAIN for this amazing post!

Bill Curlee

bcseitz

This is a great post! I'm saving this one to my collection of HowTo's.
Just removing the diff from the car looks scary when you haven't done one yet. But taking it apart... I hope I never have to!
Thank you for the picture write-up!

Bill Curlee

All the part numbers are all listed in the very first page of the post:

This is what I ordered from Gene Culley at http://www.gmpartshouseusa.com. This guy will bend over backwards to figure out what you're talking about and get the parts you need. Shipped straight to my door, taxes/shipping in, for less than 1/2 what the local dealer wanted before tax.

Part #s and prices are as follows:

LH C6 Z06 output shaft: 89060119 $57.41

RH C6 Z06 output shaft: 89060120 $38.19
RH C6 Z06 Side gear: 19180962 $76.00
RH C6 Z06 Side gear retaining ring: 12458084 $5.46

2 Axle Seals: 88996703 $18.24/each
2 Side Cover O-Rings: 89047953 $21.22/each


I purchased the cross shaft from DTE. It looks really heavy duty!

Corvette Don

Thanks man, do you happen to know the part number for the 2003+ HD OEM pinion shaft support?
Also if I pull my stg 2 diff apart to add the C6 Z06 RH shaft, gear and pinion support will I have to do any measuring for the clearances or should I be good to go??

Corvette Don

Bill, what washer are you referring too I need to contact DTE also

Bill Curlee

Don

DTE diff clutch pack springs. I ordered the C6 springs from Gene and on advice from someone, the DTE Bellview springs cause they were suppose to be heavy duty. When I compared the two, they look identical. Genes are a lot less cash

Dont know why I sad washers.

Bill

Corvette Don

Thanks Bill.

Corvette Don

What about upgrading this gear (for the left shaft) to the C6 Z06 one or is it not any different? I would think this hear would have more stress on it than the right one.

Bill Curlee

The ONLY reason that you change the short shaft gear out is because the replacement gear is now a seperate part form the shaft as the old part is a ONE piece assembly.

I do not believe that new gear is any more heavy duty than the OLD GEAR was. The under cut/ hollowed out end in the front of the gear assembly is what makes it weak and thats where it snaps.

Bill

Bill Curlee

"PINION SUPPORT UP-GRADE WARNING!"

Before you spend a lot of cash on pinion support up-grades and wont be able to use the parts that you get,,,,,I believe that you will have to properly set up the pinion and differential side bearings if you replace those parts!!!!! Failure to make the correct pinion shim and diff side bearing shim adjustments may result in ring and pinion damage.

. That’s what prevented me form up-grading that portion of the rear-end. It takes special alignment tools and knowledge to do the pinion. Its not a simple procedure if you don't know what your doing. Google that Kent Moore alignment tool that listed in the post and you will see what’s involved.

" Here is the calculation on C5 pinion shim setup:

B1 = pinion & drivers side measurement (need Kent Moore tool J42168)
B = 0.197"
B - B1 = B2

A1 = numbers on pinion gear
A = nominal value of 4.055"
A1 - A = B3

B2 + B3 = pinion shim thickness "

All the other up grades will not or should not effect critical differential set up dimensions.


Bill

Corvette Don

Makes complete sense now, thanks Bill

02SCvette

Hey guys,
What is the torque specs when putting the 2 halves of the diff asm back together? I can't seem to find it and I'm at that point.....

Bill Curlee

As per the ESI service manual,,,:




Install the left output shaft and gear to the left case.



Assemble the case halves.

Notice
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.


Install the case bolts. Tighten
Tighten the bolts to 55 N·m (41 lb ft).

02SCvette

Thanks Bill. I wasn't thinking that the "case" was for the 2 halves. I was thinking of the case as the diff housing.

Bill Curlee

WOW,,, I just purchased a Kent Moore J-42168 Shim selector tool on bay for $29.00. This makes me very happy. Taking the rear apart to install hardened C6Z parts made me want to play even deeper. So, on the obscure chance that there was one for sale at a reasionable price, I was going to get it.

http://cgi.ebay.com/ebaymotors/ws/eB...fvi%3D1&_rdc=1

The only thing it's missing is the VHS Tape. I sure I can find one of those somewhere or find a CD converted copy.

Now I just need a rear that I can expierement with.

Bill

tstar

I'm going to the Track on the 2nd... Stay tuned for a possible guinea pig!

Tim

Venomized03

OK guys.. I know this thread is a few months old but I was wondering if I order these parts(below) will my rear handle the power that Im at now? Close to 800 rwhp! I read through the other thread about replacing the clutch packs/shims ect, but I honestly do not want to go through the hassle of re-setting up the entire rear. The car will hit the local drag strip this cold season(florida) on 28" slicks but I will not be going crazy on launches.

Question about when these things break and how. Are the shafts breaking from too much power, or from wheel hop?

Any and all comments are appreciated!! THANKS

LH C6 Z06 output shaft: 89060119 $57.41

RH C6 Z06 output shaft: 89060120 $38.19
RH C6 Z06 Side gear: 19180962 $76.00
RH C6 Z06 Side gear retaining ring: 12458084 $5.46

2 Axle Seals: 88996703 $18.24/each
2 Side Cover O-Rings: 89047953 $21.22/each