Hardened left output shaft

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Mar 10, 2008 | 12:51 PM

Lord Vetter

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Race Director

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From: Deep in the Heart o' Texas

St. Jude Donor '09-'10-'11-'12-'13

Hardened left output shaft

Did a search so if this is a dupe I apologize. Going to be installing a 3.42 Z06 diff in my A4 coupe in April. PN is 12572683. Does anyone know if this comes with the hardened left output shaft? Bought the diff from a GM dealer. Thanks in advance.

Mar 10, 2008 | 01:02 PM

vettenuts

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From: At the beach in little Rhody

No, shot peened gears is the major difference I remember.

Mar 10, 2008 | 01:09 PM

AU N EGL

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From: Raleigh / Rolesville NC

Quote:

Originally Posted by vettenuts

No, shot peened gears is the major difference I remember.

Correct.

LPE sells hardened out put shafts. But unless your putting down more then 600 ft lbs of torque they really are not needed.

Mar 10, 2008 | 01:21 PM

Lord Vetter

Thread Starter

Race Director

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From: Deep in the Heart o' Texas

St. Jude Donor '09-'10-'11-'12-'13

Quote:

Originally Posted by AU N EGL

Correct.

LPE sells hardened out put shafts. But unless your putting down more then 600 ft lbs of torque they really are not needed.

I'm going to be well south of that number. I have been told that bad wheel hop can also contribute to breaking stock shafts.

Mar 10, 2008 | 02:21 PM

RIDE3311

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Joined: Aug 2004

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From: Norman OK

Quote:

Originally Posted by Lord Vetter

I'm going to be well south of that number. I have been told that bad wheel hop can also contribute to breaking stock shafts.

I have heard the same thing. A lot of the guys that are running on slicks or drag radials at the track break output shafts with a lot less than 600rwtq so it really could be wheel hop issues causing the breakage. Wheel hop is worse with drag radials because they have stiffer side walls that don't give. Just my .02.

Mar 10, 2008 | 02:58 PM

AU N EGL

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From: Raleigh / Rolesville NC

Could be driving style too.

LPE has them Rockland Standard has them also.

Mar 10, 2008 | 09:03 PM

RIDE3311

Pro

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From: Norman OK

Quote:

Originally Posted by AU N EGL

Could be driving style too.

Mar 11, 2008 | 07:10 AM

phils C5 vette

Le Mans Master

Joined: Nov 2003

Posts: 8,004

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From: Tampa Fl

St. Jude Donor '12-'13-'14

If I recall, the hardened output shaft was only about another $400.00 when I had the 3:90 gears installed. And I figured, why not.

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Mar 11, 2008 | 12:18 PM

Mike Mercury

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From: S.W. Ohio. . . . . . NRA Life Member

with the A4, if you don't have a hard-hitting 4000rpm racing converter - using drag radials (which almost makes the car a trailered track-only type car)... it doesn't seem like you could break an output shaft all they easy.

Mar 11, 2008 | 12:22 PM

#10

lucky131969

Tech Contributor

Joined: Jan 2007

Posts: 19,450

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From: Dyer, IN

Quote:

Originally Posted by Lord Vetter

Nope.

Mar 11, 2008 | 01:07 PM

#11

cyclerage23

Melting Slicks

Joined: Aug 2002

Posts: 3,333

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From: Central NJ/PA

Look into the 07-08 Zo6 leftside otput shaft. I heard it was just as good and at times earier to get.

Mar 11, 2008 | 04:47 PM

#12

speedsk899

Burning Brakes

Joined: Mar 2006

Posts: 750

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From: Bedford IN

I did both sides! Everyone says that the LH shaft is weaker.....but the RH is the side that I have always seen break! By design, the RH is weaker!

Apr 4, 2008 | 09:53 PM

#13

salto99

Intermediate

Joined: Apr 2003

Posts: 33

Likes: 0

From: Germantown MD

Just got my 3.90 done

Tony's Corvette Shop in Gaithersburg MD just finished my 3.42 to 3.90 swap. The dif uses the shot peened gears the heavy duty clutch packs and BOTH output shafts are hardened. The cost for the unit is $2,100. Very well done install and am looking forward to driving many figure eights.