Limited Slip

[Paxton50mustang]

I am looking at getting a 2002 Mercury Mountaineer with the 4.0 AWD open diff 3.55. What is all needed to convert to the limited slip? Do I just need to get an 8.8 31 spline trac-loc carrier? Or is it something different for the independent rear?

 

[zerodevil]

Why dont you just go for the locker and do it right?

 

[Paxton50mustang]

Why dont you just go for the locker and do it right?

More money, less street-ability. This is going to be my daily driver I just want a nice upgrade. A locker is what 500+ ? New trac loc is right around 200.

What is needed something for an 8.8 and 31 spline???

 

[jrford]

with my '04 AWD 3.55s Opens, I have never needed a rear locker, or LSD, snow or ice. The AWD pumps power to the front all the time, therefore only 65% winds up in the rear, never really had any problems. Compared with my heep which has a full lock center xfr case open rears, the Ex is as good or better. You could look for a JY rear and if it has the Class III hitch it should be a LSD, you can also check the door code for L4 or D4 which should be LSD. For street use TruTrac would be the way to go.. . .i was quoted $1500 to regear F/R to 3.73 and add the TruTrac on the Ex.

 

[techieman33]

yes you would need a new carrier, and the trac loc unit itself. I would check local junkyard and see if you could find a center section with limited slip already in it. It would probably be a cheaper swap.

 

[Paxton50mustang]

I hate having open rear diffs.... I can get a brand new trac loc for 220. I have to open the case anyways I need to change some seals.

What I am trying to figure out do I just need a carrier for an 8.8 and 31 spline or is it something different? Also what does the front axle have?

 

[Paxton50mustang]

Any info?

 

[Paxton50mustang]

What limited slip is needed in a 2002 mountaineer, it has the irs. Is it just 8.8 31 spline?

 

[techieman33]

please don't start multiple threads asking the same questions, I'll answer in your other thread.

 

[Paxton50mustang]

Anyone?

 

[zerodevil]

as far as i know no one here has upgraded from an open to a Limited slip, its been straight to a locker. ALSO, im dont think anyone did the work themselfs. wish we could offer a little more help bud, but i dont think anyone has done this one yet, ya want some brownie points? be a guinee pig and do a write up with some pics when your done. Good luck and again, sorry we couldnt give some more help. have you checked with a drive line specialist?

 

[Paxton50mustang]

It is ok I totally understand.

It is not that I don't know how to do it. It is I just need to know the spline count before I take it apart to order parts. Even if guys did go to lockers does anyone remember the spline count?

BTW it is an 8.8"

 

[jasongt06]

Should be a 31 spline 8.8

 

[zerodevil]

if that was all you needed to know yeah, its a 31 spline 8.8" .

 

[Paxton50mustang]

Sweet, thanks guys. Now I can just got to a Mustang site and get differential parts.

Now here is another one, what about the front, is that the same?