fx4 limited slip not working properly? - Ford Powerstroke Diesel Forum

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post #1 of 11 Old 04-15-2008, 10:59 AM Thread Starter
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fx4 limited slip not working properly?

anyone else with the fx4 package notice the limited slip in the rear rarely(if ever) locks up and spins both? i've been noticing more and more that only one will grab and no matter what i do ( wether it be on ice, snow, mud or a brake torq rolling into it easy or flooring it) it rarely will grab both..... so my question is WHAT THE HELL DID I BUY AN FX4 FOR IF IT WONT LIMIT THE SLIP ON A LIMITED SLIP?

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post #2 of 11 Old 04-15-2008, 04:01 PM
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Mine does the same thing!

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post #3 of 11 Old 04-15-2008, 04:04 PM
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I've noticed mine to be almost the same way except when I have done a few good rolling burnouts... :burnout

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post #4 of 11 Old 04-15-2008, 04:06 PM
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I was very impressed with mine the other day towing my 10K toy hauler in the mud....it threw mud up both sides the trailer perfectly!

2008 F250 FX4 CC SB Black on Black STOCK and SLOW...Rolled over and TOTALED...

2008 White with Black interior FX4 CCSB
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As far as actual HP numbers I have no idea. It don't snap your neck but.....It feels good.
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post #5 of 11 Old 04-15-2008, 04:31 PM
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It does just what it says, limites slip. Not locking. There was a commerical on T.V. not long ago that showed the difference. A locker put down something like 1000 ft/lbs of force. Our limited slip put down around 100 ft/lbs.
Don't quote me on the numbers, but it was a big difference.

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post #6 of 11 Old 04-15-2008, 04:32 PM
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Mine threw some decent mud the other day in east Tx, the really sticky clay mud!

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2006 F-250 C/C LB FX4
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post #7 of 11 Old 04-15-2008, 04:58 PM
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Quote:
Originally Posted by BigRed View Post
Mine threw some decent mud the other day in east Tx, the really sticky clay mud!


Thats where I tossed the mud at...up in Jacksonville at Mud Nats....towing my trailer up that hill going to the back.

2008 F250 FX4 CC SB Black on Black STOCK and SLOW...Rolled over and TOTALED...

2008 White with Black interior FX4 CCSB
Black C6 Vette
As far as actual HP numbers I have no idea. It don't snap your neck but.....It feels good.
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post #8 of 11 Old 04-15-2008, 05:07 PM
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Mine does the same when the diff is cold. Do a brake torque and heat it up and watch it, it'll lock in. My dad done his so bad, they stuck locked in, until it cooled back down and freed up. I believe that's why they work when your towing, they get heated up.

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post #9 of 11 Old 01-09-2009, 02:42 PM
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I NOTICED IT ALSO I HAD 1 TIRE ON THE ICE IN MY DRIVEWAY AND ONE ON THE BLACK TOP AND I WAS STUCK! I BROUGHT IT TO THE STEALER FOR AN OIL CHANGE AND TOLD THEM ABOUT IT! THEY SAID EVERYTHING WAS NORMAL THEY TRIED TO GIVE ME A BS STORY. I SAID WHY DID I SPEND $300. FOR A LIMITED SLIP DIFFERENTAL A REGULAR ONE WOULD DO THAT. ON MY NEXT OIL CHANGE I WILL TRY A DIFFERENT DEALER SEE WHAT THEY SAY. OTHERWISE I WANT MY $300. BACK!!
I TRIED SPINNING THE TIRE FASTER TO HEAT IT UP, AND IT DIDN'T EVENT TRY TO ENGAGE. BUT IF YOU STEP ON THE GAS IN THE DIRT IT WILL SPIN BOTH TIRES! I DONT GET IT?
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post #10 of 11 Old 01-09-2009, 02:47 PM
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do all fx4 have the limited slip?

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