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Crown Victoria, Marauder, Marquis

P71 rear axle spline info

3 posts 3 contributors 4,170 views
HI

highrzrOP

Jan 2, 2013 at 9:17 AM
Trying to verify what spline my axles are on my 2008 Police Interceptor car (P71) with rear end axle code of Z5. I\\'ve been told by multiple sources that the PI cars came with 31-spline axels, but want to verify this as it has an open carrier not a Traction Lok dif. I want to upgrade to a Traction Lok differential, and want to buy the correct unit for the spline I have.
JD

jdmeaux

Jan 2, 2013 at 11:44 AM
If I recall correctly, the Z5 axle code is for conventional open axle rear end with 28 splines.
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PROUD MEMBER of www.crownvic.net

It's just a SUPER-DUTY Mustang GT Sedan. 198K miles and still rolling HARD.

1997 Crown Victoria P71 SVT *** ex-US Marshall service (the CAR)
STOCK?? I bet it was modified.

13.26 @ 107.24 MPH 1/4 mi w/ me, tools, & full tank of 93 octane

I added CAI, NICHE 19 X 8.5 " wheels with 245/45ZR 19 rubbers, and completely rebuilt the front end with poly bushings, Kooks headers, 2 1/4inch exhaust, TCI 2200-2400 rpm Stall converter

.PLANS:: engine upgrade, 5.4L 2v stroker, rebuild interior in leather w/ buckets, thinking about turbos

HO

hondaclf

Jan 2, 2013 at 1:08 PM
Quote:
If I recall correctly, the Z5 axle code is for conventional open axle rear end with 28 splines.

You are partially correct, it is an open diff but in mid year '05 they started using 31 spline axles.
So highrzr, you DO have 31 spline axles.

I would check the tag on the housing though, there have been cases of the rear not matching what it says on the door.
It should say 3 27(according to the door tag), if it says 3L27 then you have a trac-lok.

edited Jan 2, 2013 at 1:12 PM

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