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#4071386 - 07/21/20 10:50 AM rear axle swap is it worth it?
Dragonrider01826 Offline
n00b

Registered: 10/16/14
Posts: 12
Loc: Ma
my GM has a 2.73 open axle and was looking at going to 3.27 or 3.55 with trac loc but sens my car is a early 05 it has 28 splines and the cost for the trac loc and gears then install them is alot of money. But I found complete rear axles with 3.27 or 3.55 for for 150 to 250 dollars with under 100K miles on them.

So is it worth just swapping out the complete axle rather then getting the parts to upgrade mine?
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#4071390 - 07/21/20 11:19 AM Re: rear axle swap is it worth it? [Re: Dragonrider01826]
Bangster Offline

Poobah

Registered: 11/30/01
Posts: 9113
Loc: Tucson Az
If you can get the entire rear end for that, and can transport it, and it has a locker (if it has 3.55 gears then trac loc was standard) then it seems like a no brainer. Pull the axles and check for wear and replace the bearing before putting it in (well, it doesn't really matter when, but easier off the vehicle easier to get all the fluid out of the axle tubes, where most of the metal bits accumulate.

03-early 05 are 28 spline with the wider housing/axles. It is tough to find a new trac loc that is 28 spline.
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00 Grand Marquis LS Premium - 97 Cougar 4.6 Sport - 89 Cougar LS - 63 Falcon 302 - 82 F-150 - 97 Mark VIII LSC - 2017 Escape SE - 2012 Fusion Sport AWD

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#4071396 - 07/21/20 11:39 AM Re: rear axle swap is it worth it? [Re: Dragonrider01826]
Danger2manifold Online   content
Rookie

Registered: 02/23/19
Posts: 58
Loc: Connecticut
Oh hell yeah that's worth it! Plus they have less miles on them than your current rear axle, so there's also that!
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Current Panther:
1999 Crown Victoria LX - 62k miles, Toreador red, factory 20 spoke chrome wheel covers, Pioneer 6x8 2-way speakers, Kenwood KMM-BT225U head unit, PPI Ion i650.1 monoblock amplifier, two 12" JBL subs in sealed enclosures, 2/2019-Present

Past Rides:
2003 Buick Regal GS Joseph Abboud edition - as close to a Grand National as I'll probably ever get, traded in 2/2019
1996 Lincoln Town Car Signature - dubbed "The Emancipator" by friends, rear ended and totalled in 5/2016
2002 Buick Rendezvous CXL - the classic parental hand-me-down, passed down the line to younger brother in 2/2015

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#4071478 - 07/22/20 08:52 AM Re: rear axle swap is it worth it? [Re: Dragonrider01826]
2008interceptor Offline
Over the Hill

Registered: 09/02/02
Posts: 3130
Loc: Pennsylvania
One thing to remember is at 100,000+. There is a very good chance the Trac loc is going to need rebuilt. So either make sure it has been done recently or do so yourself before installing. You don't want to do the swap only to end up with it performing like an open differential anyways. Except now it will spin even easier with higher gearing. Watch also since 3.27 had Trac loc optional 3.55 came with it by default. You will also need a tune so the spedo odo and shifting will be corrected.
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2008 Ford Crown Victoria Police Interceptor P71 with street appearance package.

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#4071480 - 07/22/20 09:50 AM Re: rear axle swap is it worth it? [Re: Dragonrider01826]
Dragonrider01826 Offline
n00b

Registered: 10/16/14
Posts: 12
Loc: Ma
Well the one im interested in is a 3.27 traclock from a 2010 with 75K miles on it and he want 175 buck completed.

Didn't think it would need to be rebuilt but will look into that.

Ya alrdy got a Mo tune done.


Edited by Dragonrider01826 (07/22/20 09:59 AM)
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#4071484 - 07/22/20 11:24 AM Re: rear axle swap is it worth it? [Re: Dragonrider01826]
BlackVic_P71 Offline
Grand Poobah

Registered: 08/28/09
Posts: 14557
Loc: LI, NY
It's better to do the seals and bearings before bolting it in, much better than having to do them a few months down the road with the rear in the car...and you get to check the fluid condition when you do it, see if there are any axle shaft issues, etc.
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The future is very fast and extremely quiet...but a bit burny.

1989 Ford Crown Victoria Country Squire - 347
2005 Crown Victoria LX Sport with Stainless Works full exhaust, Addco swaybars, Heinous control arms, Powerslot rotors, Hawk HPS pads
Accufab plenum for a DBW Panther
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#4071486 - 07/22/20 01:06 PM Re: rear axle swap is it worth it? [Re: Dragonrider01826]
2008interceptor Offline
Over the Hill

Registered: 09/02/02
Posts: 3130
Loc: Pennsylvania
You already had a tune for the different gears you've yet to purchase installed? I'm not saying you'll need a tune in general done. You'll need one done or updated to tell the computer the new axle ratio. I went from 3.08 to 3.55 on a previous panther and slammed into the Rev limiter at near full throttle. Shifts were off and if floored you'd have to let off for it to shift. After the retune it was all good though. Do check the condition of the differential. Taking it all back apart to change bearings seals and clutches not cheap, in time or parts. Much easier off the car you can probably get the carbon clutch kit used on some mustangs.
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2008 Ford Crown Victoria Police Interceptor P71 with street appearance package.

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#4071772 - 07/24/20 10:19 AM Re: rear axle swap is it worth it? [Re: Dragonrider01826]
Dragonrider01826 Offline
n00b

Registered: 10/16/14
Posts: 12
Loc: Ma
Just a update, I got the 3.27 complete axle. will be getting a c rebuild kit for it.

This axle coming from a 2009 so it should have the updated spline.

he also throwing in the drive shaft with it which was a surprise to me, ho I just have to get the spacer to make it work for GM
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05 grand marquis ultimate edition LS Birch silver 157,295

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#4071838 - 07/25/20 09:44 AM Re: rear axle swap is it worth it? [Re: Dragonrider01826]
BlackVic_P71 Offline
Grand Poobah

Registered: 08/28/09
Posts: 14557
Loc: LI, NY
The spacer and your stock tans yoke
_________________________
Originally Posted By Jeremy Clarkson
The future is very fast and extremely quiet...but a bit burny.

1989 Ford Crown Victoria Country Squire - 347
2005 Crown Victoria LX Sport with Stainless Works full exhaust, Addco swaybars, Heinous control arms, Powerslot rotors, Hawk HPS pads
Accufab plenum for a DBW Panther
Blue LED buttons/switches how to

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#4071850 - 07/25/20 10:24 AM Re: rear axle swap is it worth it? [Re: BlackVic_P71]
124neta Offline
don't get riled, sugar!
Poobah

Registered: 04/03/09
Posts: 6053
Loc: Il
Originally Posted By BlackVic_P71
The spacer and your stock tans yoke


Since this was brought up, I'll throw a "too lazy to do my own research" question out there.

The way I understand: The swap can be done without switching yoke as long as one has the spacer, but its best to swap over the civilian yoke, because the civi yoke has a longer splined area that can handle more power before failure

So this leads me to believe A: For a bone stock application that isn't getting abused, the Police yoke is just fine. B: For heavy duty/high power applications, P71 owners should switch their yokes out with the "better" ones.

Can someone correct me here in the high likelihood I'm wrong.
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