Rear Differential Clutch Pack - Ford Powerstroke Diesel Forum
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post #1 of 23 Old 06-17-2013, 09:21 AM Thread Starter
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Rear Differential Clutch Pack

More warranty work done on my 2010 F350 6.4 L Diesel.

There was a strange chatter I noticed when pulling away from a stopped position into a turn. The best way to describe it was that it felt like it was stuck in 4x4.

After 3 days in the shop they replaced the clutch packs in the rear diff at no charge to me....

Apparently this is a common problem.

Part # F81Z*4947*AA (Differential Kit)
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post #2 of 23 Old 06-17-2013, 10:31 AM
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Same here...twice, and needing it done again!

2010 Ford F-250 Super Duty, Lariet 4x4, Crew Cab Short Bed, loaded with every option...and more
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post #3 of 23 Old 06-17-2013, 03:16 PM
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How many miles?

My Trac Lok was smoked after ~14,000 miles of regular driving...even ended up stuck in the yard at my other house ($300 tow bill later as two trucks had to pull me out) as the front end sunk down some. As you know the front axle is open, so I was stuck with two open axles. Funny now, I was pissed off bad then.

Mid '09 build here. I had it pulled and installed a True Trac after arguing with the dealer that a limited slip differential should actually grip with BOTH rear tires going forward and not spin just one.

Shop disassembled the TL for me on a bench, clutches were black. Just tossed it in the scrap heap. LOVE the True Trac, nothing to wear out, grabs fantastic.
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post #4 of 23 Old 10-01-2015, 04:21 AM Thread Starter
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....And it's doing it again Arghhhhhh !!!!!!

And of course it's no longer under warranty.

Someone tell me more about this True Trac (in the mean time I'm off to google it now)
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post #5 of 23 Old 10-01-2015, 04:34 AM Thread Starter
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post #6 of 23 Old 10-01-2015, 06:39 PM
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Diff Wizard suggests True Trac limited slip for Ford 10.25" & 10.5" with 35 spline axles - TT 915A550

TT 915A550 is the part number at Randy's.



The Traclok is junk, do not waste another cent on it. If the Truetrac was not available, I would have gone with the Detroit Locker. Clutch type traction devices just slowly degrade in performance... it is their nature. I went with an Eaton LSD in my old F150 as there was no TT available then.
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post #7 of 23 Old 10-02-2015, 02:29 AM Thread Starter
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So if I'm considering this True Trac diff, do I have to change the front and back at the same time or can I run a True Trac in the rear and leave the front stock????
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post #8 of 23 Old 10-02-2015, 03:14 AM
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You only have to match the front if you are changing the gear ratio.... you can run the tru trac just in the rear.
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Originally Posted by 6.0Stroker View Post
It's Toren. .. don't question it ..
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post #9 of 23 Old 10-02-2015, 11:11 PM
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Exactly. I am still running an open front, reminds me I need to order an ARB.
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post #10 of 23 Old 10-03-2015, 12:06 AM
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Quote:
Originally Posted by F350guy View Post
Diff Wizard suggests True Trac limited slip for Ford 10.25" & 10.5" with 35 spline axles - TT 915A550

TT 915A550 is the part number at Randy's.



The Traclok is junk, do not waste another cent on it. If the Truetrac was not available, I would have gone with the Detroit Locker. Clutch type traction devices just slowly degrade in performance... it is their nature. I went with an Eaton LSD in my old F150 as there was no TT available then.
I have these for a bit better price than Randy's.
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