P/N for 8.8 Trac Loc ?
 

I tried to talk to the local McDonalds rejects at my Ford Parts counter but gave up after trying to explain for 15 minutes what a Traction Loc Differential is.
I have a spare LS carrier sitting around, the part number on it is 4205-AA . I wonder if this one fits a 2000 F150 with the 8.8 open rear axle or what application it's for. Would be good to know before I dumb out the liquid gold gear oil and dig into the rear.
Thanks

Fritz


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2000 F150 XLT 4x2 ExtCab Styleside 4.6l Auto in Island Blue.
Dark Graphite interior, White face gages, Superchip, K&N air filter,
Airbox Mod, Front window tint, Flowmaster 50 SUV,
LeBra soft tonneau, LineX Bedliner, Ford Bugshield, B-Quiet Sound Shield,
2 in lowering shackles, Hellwig Swaybar, Monroe Reflex Shocks,
100w Head and Fog lights, Clifford Alarm, Blaupunkt CD, Pyramid Amp,
JBL comp speakers, Punch subwoofers, Escort 8500 Radar Detector,
ECM Jammer Pod, some nice floormats and lots of payments.

P/N on 8.8" Trac-loc (31-spline) should be: M4204F318. I could be wrong; however, I think this P/N is correct. I cannot remember the old P/N on 31-spline that had the 3/4" spider pin (which was pre-1989?).
To my knowledge, after 1989??, all 8.8" have 7/8" spider pin & different cut (pitch) of internal gear teeth. I know this is sure for 8.8" open diff.--but not fore sure if gear-cut changed on 8.8" trac-loc.

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1999 Teal Blue F-150 S/C
4.6L, XLT, 3.55 L/S 4x2
Tow pkg., Rhino liner, Engine block heater & Swiss hard toneau cover. Premium sound
255/75 R16 Generals-owl
This" is Mama's pride"