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#4063520 - 05/17/20 08:43 AM Re: Differential mix matching [Re: Blu]
2004_p71 Online   content

no replacement for displacement
Posting Addict

Registered: 09/04/03
Posts: 15478
Loc: Quebec Canada
so you have 2 shims on it then ?
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#4063572 - 05/17/20 03:57 PM Re: Differential mix matching [Re: Blu]
Blu Offline

Climber

Registered: 11/27/07
Posts: 560
Loc: Milwaukee, WI
Correct 2 shims.

Going to play around with swapping internals later just to see if it can be done or not...
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#4063614 - 05/17/20 09:49 PM Re: Differential mix matching [Re: Blu]
2004_p71 Online   content

no replacement for displacement
Posting Addict

Registered: 09/04/03
Posts: 15478
Loc: Quebec Canada
I have always been lucky enough to only have to use one shims . I heard mixed opinions about stacking up shims.
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new best time 13.079 @ 105 1.8 60'

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#4063642 - 05/18/20 12:52 PM Re: Differential mix matching [Re: Blu]
Blu Offline

Climber

Registered: 11/27/07
Posts: 560
Loc: Milwaukee, WI
They seem like they would be pretty secured from a rocking/extruding problem. They are underneath a pressed in bearing. Two tapered roller bearings with an oil film should soak up enough of that drive/coast shock to not be an issue. The only thing I could see getting sloppy is if the crush sleeve collapses more after sometime. What are the potential issues?
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#4063646 - 05/18/20 01:14 PM Re: Differential mix matching [Re: Blu]
2004_p71 Online   content

no replacement for displacement
Posting Addict

Registered: 09/04/03
Posts: 15478
Loc: Quebec Canada
Some shims were not made exactly the same way and would have an edge that would prevent the shim from sitting perfectly flush with the other one . The pinion nut requires lots of of torque to crush the sleeve so I dont see why it would cause an issue but like I said from what I read online there are mixed reviews .
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new best time 13.079 @ 105 1.8 60'

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#4063672 - 05/18/20 02:06 PM Re: Differential mix matching [Re: Blu]
Blu Offline

Climber

Registered: 11/27/07
Posts: 560
Loc: Milwaukee, WI
Ok, I get what you're saying. I noticed that the thicker shims in the kit were die cut from plate steel while the thinner ones were cut from shim stock, which is typically ground and hardened. But even if there was a burr, the fact that the shims are squashed under that bearing and rechecked gear pattern/backlash shouldn't make much difference..?


Edited by Blu (05/18/20 02:07 PM)
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#4063780 - 05/18/20 10:35 PM Re: Differential mix matching [Re: Blu]
2004_p71 Online   content

no replacement for displacement
Posting Addict

Registered: 09/04/03
Posts: 15478
Loc: Quebec Canada
I guess not but once again I never had to deal with that so who knows .

after reading the ford procedure you posted it looks like using two shims is normal procedure after all


Edited by 2004_p71 (05/18/20 10:39 PM)
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new best time 13.079 @ 105 1.8 60'

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#4064044 - 05/21/20 09:59 AM Re: Differential mix matching [Re: Blu]
professorP7B Offline
Member

Registered: 04/02/20
Posts: 107
Loc: Massachusetts
Not to hi-jack a thread entirely, but looking to get some thoughts on a 3.55 axle swap on my '11.

Reasons:

1. I've been noticing some acceleration whine clearly coming from the rear end that's progressively getting worse.

2. I noticed a squeaking noise when going over bumps at first, then I found I could get the noise to happen simply by bumping the car back and forth by hand against the parking pawl. Had a friend do that while I looked underneath and noticed the pinion flange sliding in and out of the axle housing by about 1/8" and was able to stop the noise by forcing my hand up against the flange. SOOO, the pinion bearings are likely on the outs. (I can see a pinion seal was installed recently, before I bought it. I know they obviously didn't tear it down and replace the crush sleeve because when I changed my gear oil it was black as night.)

3. I found a complete 3.55 axle assembly out of an '06 with 13k on it for $300 bucks.

4. I don't have the interest time to teardown my axle (while re-gearing it to 3.73.) 3.55 is close enough (currently has a 3.27 trac-lock.)

I'll replace the axle seals on it before installing, and since I'm pulling the axle I'll also likely install some Heinous control arms and a Metco watts linkage while I'm in there. Anything I'm missing here?
_________________________
Former Toyota tech. First-time Ford owner. ASE-certified Advanced Level Specialist.
Current vehicles:
2011 Crown Vic P7B (SAP, former campus police vehicle)
Purchased 3/27/20 w/51K, 819 idle hrs.
Jmod, Sonnax 76833E OD Pin, PML deep trans. pan, DANA-Spicer diff. cover, RKE, ext. trans. filter
2011 GMC Sierra 1500 SLE
Purchased 2/23/17 w/57K
5.3L LC9 V8 4X4 Ext. Cab
My sig would be obnoxiously long if I listed the mods on this one...
2007 Mitsubishi Galant ES AKA "Oreo"
Purchased 6/5/17, sold 10/12/17, given back to me 5/26/20
Factory rot speedholes. She's a sleeper, one turn of the key will have you saying "Wow, it runs."

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#4064060 - 05/21/20 12:32 PM Re: Differential mix matching [Re: Blu]
2008interceptor Offline
Over the Hill

Registered: 09/02/02
Posts: 3100
Loc: Pennsylvania
You may want to have the ecm tuned to reflect the higher gearing. Earlier you could change out a spedo gear but now it uses a vss sensor instead I believe. I went 3.08open -3.55 lsd on a 98 towncar. It was driveable but shifted early, yours is less of a difference than mine though. Mine would hit the Rev limiter under heavy throttle and not shift. You may just have the speedometer be off and slightly earlier shifts.


Edited by 2008interceptor (05/21/20 12:41 PM)
_________________________
2008 Ford Crown Victoria Police Interceptor P71 with street appearance package.

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#4064158 - 05/21/20 10:54 PM Re: Differential mix matching [Re: professorP7B]
2004_p71 Online   content

no replacement for displacement
Posting Addict

Registered: 09/04/03
Posts: 15478
Loc: Quebec Canada
Originally Posted By professorP7B
N
2 I looked underneath and noticed the pinion flange sliding in and out of the axle housing by about 1/8"


wow that is really bad !
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new best time 13.079 @ 105 1.8 60'

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#4064328 - 05/22/20 07:28 PM Re: Differential mix matching [Re: 2008interceptor]
professorP7B Offline
Member

Registered: 04/02/20
Posts: 107
Loc: Massachusetts
Yes I plan to tune the ECM for the new ratio accordingly. Any preferred tuners? I'll make/ask on a more dedicated thread for heavy details. I don't plan on using any canned Mustang tunes included with the unit, but am interested to see what's best.
_________________________
Former Toyota tech. First-time Ford owner. ASE-certified Advanced Level Specialist.
Current vehicles:
2011 Crown Vic P7B (SAP, former campus police vehicle)
Purchased 3/27/20 w/51K, 819 idle hrs.
Jmod, Sonnax 76833E OD Pin, PML deep trans. pan, DANA-Spicer diff. cover, RKE, ext. trans. filter
2011 GMC Sierra 1500 SLE
Purchased 2/23/17 w/57K
5.3L LC9 V8 4X4 Ext. Cab
My sig would be obnoxiously long if I listed the mods on this one...
2007 Mitsubishi Galant ES AKA "Oreo"
Purchased 6/5/17, sold 10/12/17, given back to me 5/26/20
Factory rot speedholes. She's a sleeper, one turn of the key will have you saying "Wow, it runs."

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#4064330 - 05/22/20 07:31 PM Re: Differential mix matching [Re: 2004_p71]
professorP7B Offline
Member

Registered: 04/02/20
Posts: 107
Loc: Massachusetts
Yeah it's one of the worst I've seen. I cranked on the nut to take up some of it, not that that's an acceptable repair. But it'll let me do the light, around-town driving I'm doing now per the shutdown. 3.55 axle from an '09 CVPI w/16k on it is currently on it's way. That unit I mentioned in my first post wasn't available.
_________________________
Former Toyota tech. First-time Ford owner. ASE-certified Advanced Level Specialist.
Current vehicles:
2011 Crown Vic P7B (SAP, former campus police vehicle)
Purchased 3/27/20 w/51K, 819 idle hrs.
Jmod, Sonnax 76833E OD Pin, PML deep trans. pan, DANA-Spicer diff. cover, RKE, ext. trans. filter
2011 GMC Sierra 1500 SLE
Purchased 2/23/17 w/57K
5.3L LC9 V8 4X4 Ext. Cab
My sig would be obnoxiously long if I listed the mods on this one...
2007 Mitsubishi Galant ES AKA "Oreo"
Purchased 6/5/17, sold 10/12/17, given back to me 5/26/20
Factory rot speedholes. She's a sleeper, one turn of the key will have you saying "Wow, it runs."

Top
#4064432 - 05/23/20 09:59 PM Re: Differential mix matching [Re: professorP7B]
2004_p71 Online   content

no replacement for displacement
Posting Addict

Registered: 09/04/03
Posts: 15478
Loc: Quebec Canada
Originally Posted By professorP7B
Yes I plan to tune the ECM for the new ratio accordingly. Any preferred tuners? I'll make/ask on a more dedicated thread for heavy details. I don't plan on using any canned Mustang tunes included with the unit, but am interested to see what's best.


got with marty .
I had an sct tune on my 2011 and ran ok but the tune for the crown vic are very generic . i got a tune from mart not even a week later and it,s a whole different car now
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