Locking Rear End Feature - Diesel Forum - TheDieselStop.com
'11-16 General Questions General questions related to 2011-Up Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

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post #1 of 8 (permalink) Old 01-26-2019, 08:35 AM Thread Starter
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Question Locking Rear End Feature

Mine is 2011 SD. Has the locking rear end feature.

Question: What is intended purpose of this? When to use? When not to use this feature?
Can turn truck L or R when locked?
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post #2 of 8 (permalink) Old 01-26-2019, 02:49 PM
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Use it when you want to. It will turn, but the rear wheels will scratch. I hardly use mine. Mostly use 4wd. But I do use it. Be careful, sometimes with it locked both wheels will spin and it will cause the rear end to slide.

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post #3 of 8 (permalink) Old 01-27-2019, 04:30 PM Thread Starter
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Long ago, Used it one time pulling RV, making transfer from wet grass to dry pavement, up an incline. Sharp right turn, hear loud knocking noise from rear, while on pave part. And some shuttles. Once straight on pavement, disengaged lock, ok.

Scare me.

But found it unusual. I was mechanic in my youth, understand differentials, even limit slip (posi traction)types. But this locking rear function concerns me, worry if any damage here. I do have lots of miles, towing and untethered, nothing adverse happened.

Just trying to understand why this happened!
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post #4 of 8 (permalink) Old 01-27-2019, 05:34 PM
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A locking diff is just that. it locks both rear axles together. A limited slip will transfer power to the wheel with traction. I have used mine in the snow a couple times when the snow gets deep. If you go around a corner with the diff locked only thing that will happen is it will slide the inside tire. Just don't make it a habit on dry surfaces.
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post #5 of 8 (permalink) Old 01-28-2019, 06:02 PM
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Quote:
Originally Posted by CajunMick View Post
Long ago, Used it one time pulling RV, making transfer from wet grass to dry pavement, up an incline. Sharp right turn, hear loud knocking noise from rear, while on pave part. And some shuttles. Once straight on pavement, disengaged lock, ok.

Scare me.

But found it unusual. I was mechanic in my youth, understand differentials, even limit slip (posi traction)types. But this locking rear function concerns me, worry if any damage here. I do have lots of miles, towing and untethered, nothing adverse happened.

Just trying to understand why this happened!
With the weight of the RV on the truck the back tires had too much traction to easily skid and make up for the different wheel speeds needed for the turn. That made the back bounce and jump a lot more that it normally would in that circumstance.

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post #6 of 8 (permalink) Old 01-29-2019, 11:35 AM
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I've used mine in wet grass, slick boat ramps, and coming up my steep snow-covered driveway. It definitely is better than my 2001's limited slip rear end. I've had it not disengage once and in a turn, the inside wheel started hopping. Best way I've found to make sure it unlocks is to stop, turn it off, shift to neutral and let the truck roll back a bit, then shift back into drive. Use this only where both wheels can spin freely if needed.
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post #7 of 8 (permalink) Old 01-30-2019, 07:24 AM
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This thing unlocks all by itself at speeds above 15MPH I believe. Then when you get below that speed it locks up again.
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post #8 of 8 (permalink) Old 01-30-2019, 08:01 AM Thread Starter
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Thanks for the information, folks.
Except for straight ahead drive, Guessing never use lock rear when towing RV.
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