4WD Lock versus 4WD low

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R.L.K.

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My truck : 2014 QC Express 4x4 6 speed 3.55 DIFFERENTIALS

All I know is with stock tires I plowed through over 20 miles of snow 11-14" and 6 miles as the first vehicle to drive through it and I had no problems at all as long as I kept a good head of steam going .

ab21030bf7546d64269b88b62fdbe9d5.jpgb2cea4b81c9b1f6b5528c1fa9c8d3f33.jpgb41bb2ed3d8fb04ea5db9319a011174c.jpg
 
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kg93

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My truck : 2014 QC Express 4x4 6 speed 3.55 DIFFERENTIALS

All I know with stock tires I plowed through over 20 miles of snow 11-14" and 6 miles as the first vehicle to drive through it and I had no problems at all as long as I kept a good head of steam going .

ab21030bf7546d64269b88b62fdbe9d5.jpgb2cea4b81c9b1f6b5528c1fa9c8d3f33.jpgb41bb2ed3d8fb04ea5db9319a011174c.jpg

who needs a plow?
 

R.L.K.

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A litle off subject but could someone answer a question for me with confidence.

While rear wheels off the ground ON A 4TH GEN RAM , if you spin a rear tire by hand in one direction which way would the opposite wheel turn to verify a limited slip/Anti-spin Differential or an open differential?

Thanks !
 
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kg93

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dont quote me but i think if its in neutral they will both spin the same way
 

R.L.K.

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Anyone else ?
 

loveracing1988

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I know mine does regardless of what others "think" they know saying it doesn't fully lock in.
There are a handful on here that seem to have transfer cases set to the lowest end of the spec for air gap on the clutch so the delay is pretty much unnoticed. A coworker just leased a 2016 bighorn with the pentastar and in 4 lock and 4 low he can drive around on dry pavement with zero binding just like my 2013 did.
 

loveracing1988

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Anyone else ?
The style of limited slip ram uses needs torque to apply the clutches to transfer power, if you have one tire on ice and one on dry parent you aren't going anywhere, but if they are both on ice you will get both tires spinning.
 

loveracing1988

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With both rear tires of the ground, if you spin one by hand and the other doesn't spin then you have an open differential with no lsd.

If instead the other wheel turns in the opposite direction you are turning then you have some type of lsd installed.

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No...
There are 3 connections on an axle, if you spin 1, another one has to spin as well. Traditional lsd's if you spin a tire the other one will spin in the same direction but an open differential the other tire spins in the opposite direction
 

R.L.K.

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The style of limited slip ram uses needs torque to apply the clutches to transfer power, if you have one tire on ice and one on dry parent you aren't going anywhere, but if they are both on ice you will get both tires spinning.
That style would be OK for driving on snow/ice with patches of dry pavement on the FRONT diff , but that sucks for the REAR diff imo .

Per my original Q. Which way would the opposite tire on the REAR on a 4th Gen spin off the ground ..

If I'm understanding this properly to verify( LSD/Anti-spin )or an open diff on the rear on a 2014 Express one would have to open the diff to absolutely verify ?
Could you jack it up ,xsmn in nutral , hold one wheel by hand to keep from turning and try to spin the other to verify ?

My build sheet says " Anti-spin Differential "3.55 , I'm gonna try multiple cenarios and see if I can shed some light on this subject. I'll post my findings .
 

Makin-Chips

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My truck : 2014 QC Express 4x4 6 speed 3.55 DIFFERENTIALS

All I know is with stock tires I plowed through over 20 miles of snow 11-14" and 6 miles as the first vehicle to drive through it and I had no problems at all as long as I kept a good head of steam going .

ab21030bf7546d64269b88b62fdbe9d5.jpg[/QUOTE]

Looks like you got the white stuff under control. :)

I remember those days, I'm originally a western PA redneck. I'll pass on it now and take the 100+ degree summers. White stuff is fine, its the cold that comes with it. And maintenance to keep your ride looking good and solid.

Enjoy
 

af2018

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Yes, you're getting it.

It's like this......

2wd - obvious

4wd auto - 4wd when needed, normal 1 to 1 gearing thru the t-case, used for snow, ice, whenever you want

4wd lock - 4wd all the time, normal 1 to 1 gearing thru the t-case, used for snow, ice, whenever you want as long as the traction is limited, limited turning radius

4wd low - 4wd all the time, 2.72 to 1 gearing (almost 3x lower), very loose surfaces, slow maneuvers, when high torque/traction is needed, speed limited due to gearing (possible to over-rev engine), limited turning radius


Seven years later and your answer still works o_O
 

Rader

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I read through the 13 pages and there are a few points that were left out.
3) if you don't believe that center diff 4x4 systems are inferior ask yourself why the rubicon, powerwagon, and hummer h1's don't come with a center diff.

Slight nit-pick....Hummer H1 did have a T case option that had a center differential. The T case was 242AMG. The center differential was about the same as the center differential in a Jeep or Dodge NV 242 except that the mode mechanism did not have a 2WD mode. After comparing the internals of a Grand Cherokee NV242 HD that had 2 WD Mode with the internals of a 2000 Durango 242 that did not have 2 WD mode... The difference is by leaving out the 2WD mode the mode gears are wider and have more so the T case is a bit stronger so more reliable.
 
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