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#3581481 - 03/20/17 04:25 PM How do I remove this S spring in my differential
xcopkar Offline
Member

Registered: 01/30/16
Posts: 124
Loc: Il
What is this S spring on my CVPI differential and how do I remove and reinstall it? I can't pull it out with vise-grips. Is a special tool needed?

Thank you.


[img][IMG]http://i1305.photobucket.com/albums/s553/whackenputter/S30A0022_zpsjqrop8ec.jpg[/img][/img]
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2009 B/W CVPI trac lock, license NOTAKOP
2007 B/W CVPI, license XCOPKAR

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#3581513 - 03/20/17 05:00 PM Re: How do I remove this S spring in my differential [Re: xcopkar]
charlieD Offline
Over the Hill

Registered: 05/29/16
Posts: 1448
Loc: right next to Motown
Check you You Tube, a bunch of video's on how to do it.
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#3581521 - 03/20/17 05:10 PM Re: How do I remove this S spring in my differential [Re: xcopkar]
RF_Overlord Offline
Over the Hill

Registered: 12/14/02
Posts: 4744
Loc: MA
That spring is what pushes the clutch packs together to provide the "posi" function of a Trac-Lock diff.
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#3581537 - 03/20/17 05:33 PM Re: How do I remove this S spring in my differential [Re: xcopkar]
xcopkar Offline
Member

Registered: 01/30/16
Posts: 124
Loc: Il
Thank you for the advice.
_________________________
2009 B/W CVPI trac lock, license NOTAKOP
2007 B/W CVPI, license XCOPKAR

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#3581545 - 03/20/17 05:44 PM Re: How do I remove this S spring in my differential [Re: xcopkar]
BlackVic_P71 Offline
Grand Poobah

Registered: 08/28/09
Posts: 13590
Loc: LI, NY
Are you replacing the clutches in it?
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#3585074 - 03/24/17 09:30 AM Re: How do I remove this S spring in my differential [Re: xcopkar]
xcopkar Offline
Member

Registered: 01/30/16
Posts: 124
Loc: Il
I thought I had to remove the S spring to remove the C clips that hold my axles in place. It turns out I had to loosen the magnetic sensors by the tone ring. That allowed the axles to go in far enough that I could remove the C clips.
_________________________
2009 B/W CVPI trac lock, license NOTAKOP
2007 B/W CVPI, license XCOPKAR

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#3587362 - 03/26/17 09:34 PM Re: How do I remove this S spring in my differential [Re: RF_Overlord]
PHoganDive Offline
Over the Hill

Registered: 06/11/11
Posts: 3043
Loc: Mass, USA
Originally Posted By RF_Overlord
That spring is what pushes the clutch packs together to provide the "posi" function of a Trac-Lock diff.

The "S" spring only provides a bit of initial preload. Under high power, the lions share of the locking force is applied by the spider gears. The angle on the face of the gear teeth tries to force the gears apart, this separating force increases with load (torque) and is applied to the locking clutches (in addition to the S spring force). Note that this also means the locking force increases with applied power, so the wheels will be locked together much harder under throttle, than when coasting or light power.
Under heavy throttle, over 95% of the locking force comes from the spider gears, not the "S" spring.
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1996 GMQ 116K miles, Bilstein shocks, otherwise stock (Retired 7/2011)

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#3587698 - 03/27/17 06:38 AM Re: How do I remove this S spring in my differential [Re: xcopkar]
xcopkar Offline
Member

Registered: 01/30/16
Posts: 124
Loc: Il
Thank you for the explanation.
_________________________
2009 B/W CVPI trac lock, license NOTAKOP
2007 B/W CVPI, license XCOPKAR

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#3587866 - 03/27/17 12:15 PM Re: How do I remove this S spring in my differential [Re: xcopkar]
RF_Overlord Offline
Over the Hill

Registered: 12/14/02
Posts: 4744
Loc: MA
Yes, thanks...I knew the spring alone couldn't be enough...
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'00 Grand Marquis GS (Silver)
No ABS, no RAS, no Traction Control, manual HVAC,
single exhaust, 2.73 open, and an ugly-ass landau roof.
Exactly what I wanted in a DD: simple.

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