Upgraded Differential on 2nd Gen?

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JExpedition07

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how'd you find that out? what gear ratio?

Rear Axle Code on your door jamb sticker. You can look up the letter bank. C is open diff L is LSD after your gear ratio. Heres the breakdown on decoding it.
067450AA-DC61-47A9-8081-DADD2460461C.png
 

98eb5.4

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Yes that's absolutely true too.

Was reading a few things last night that said Expys with AdvanceTrac all have open diffs. Anyone know if that's true? I thought AdvanceTrac came standard. I wouldn't want to muck with the system by adding something it isn't expecting and cause problems.

Funny about the cosmetics comment! :)

got a link? not sure when advancetrak was prob first an option, then across the board on expys

-edit: had a quick look, started as an option on 2nd gen

https://www.ford-trucks.com/forums/...dvance-trac-vs-limited-slip-differential.html

http://www.expeditionforum.com/threads/advancetrac-vs-limited-slip.28870/
 
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theoldwizard1

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Hi Wizard... would you happen to know who makes one for the Ford 9.75" rear end with IRS?
First, to show you what I DON't know, I thought it was an 8.8 ! Obviously I am no "wizard" on rear axles.

Hi I can find lockers for the 2002 or earlier with the solid axles but nothing for the 2003 and on. I'm told it's because of how the axle shafts are held into the side gears (ring clip vs c clip). The ring clips require side gears with a retention feature. Evidently not something most aftermarket differentials can accommodate.
That just does not "smell" right. I can not believe Ford would have 2 different methods of retaining the axle, one for solid axles and one for IRS. I could be wrong.

Shopping around, some of the places selling 9.75 LSD says they fit F150 (solid axle) AND Expedition (half shafts).
 

Texpedition45

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Do a quick search.

I can't for the life of me recall which member did it, but there's one on here with a... 2011? and an air locker. I think there's a parts number mentioned as well.
 

plumcolr

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That pretty well explains what I thought: AdvanceTrac works by selectively applying braking to the slipping wheel; not effective for drag racing or smoking the tires, and addition of a LSD will really not work well. In fact might make for unpredictable behavior (read might be dangerous under severe conditions), just like using 4wd in an inch or two of wet snow.
 
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Vancouver Bob

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but u said?

"My '03 Expy has open differentials"

what gear ratio?

That I did... and I do :). But I know they offered LSD's so seems it would be easy to find one. But I'd really rather put the money towards a selectable locker.
 

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