Do 4th gen 1500 4x4s have "active LSD" - or not?

[62Blazer]

Doesn't seem like a very good system if the driver has to "understand it" for it to work.

So if all these trucks have this why are they able to spin a wheel when in snow/ice? Like I said, I'm pretty sure this system DOES work on my truck. Haven't had it in snow but in mud the spinning wheel only spun one or two revs before the other wheel started pulling.

In regards to why a truck may still spin only one tire, such as when on ice. There is simply a limit to how much torque can be transferred from the low traction tire (spinning tire) to the one with traction. Part of that limit is in the programming of the system, so basically how much brake force the system applies to the spinning tire. Keep in mind that there is a balance of how much braking to apply to the spinning wheel before you get to the point of diminishing returns....if you apply too much braking you basically lock the tire up in order to get the other tire spinning, but you are now stuck because the one tire is locked up........ There is also the issues of strength of the components since applying to much brake load can put a lot of stress on parts.

One thing to clarify (I'm not specifically replying to this post, but just overall comments that I see)....is that just because one tire is spinning and other tire is not does not mean the system is not working. This goes for BLD/electronic traction control or a limited slip differential. Either system is still transferring torque to the wheel with traction, but it just can't transfer enough torque for it to spin or make the vehicle move forward. For example if you have one tire in the air it basically takes almost zero torque to spin. Even you transfer 100% of the torque to the other tire that is 100% x 0 which equals 0.

 

[Mister Luck]

If you have a V8 1500 with the 8 speed transmission you probably have an active LSD, the 2500 that use a 6 speed transmission or any other truck (in stock configuration) that uses a 6 speed transmission probably does not.
Diesel’s have a higher torque / horsepower curve and therefore have a different axle ratio pairing.

The full time 4x4 off-road enthusiasts tend not to use anti-roll bars on the rear or front axle . An anti-roll bar’s intention is to keep both wheels of the same axle on the pavement which helps LSD’s perform as intended but are not much help off pavement.

I use 4low in my 1500 with a v8 and it works for most situations where extra traction is needed but I’m not rock crawling either.

 

[2020PW]

You don’t need lockers, you can lock up both axles without LSD or BLSD

 

[metalchewy]

You don’t need lockers, you can lock up both axles without LSD or BLSD

Yah, but in the rockies on that rutted out road on the hill you have to get over, having LSD on your truck's build sheet sure helps you get to your favorite hunting spot easier.

 

[62Blazer]

Another comment is that electronic traction control that uses the brakes to transfer power has been very common since the early 2000's and some form of it is found on the majority of vehicles made today. My wife's last minivan was a 2007 model and had standard brake based traction control on it. If you were spinning on a patch of snow you could feel and hear the brake kick in on the spinning wheel. Not 100% sure but traction control has likely been a standard part of a Ram truck for years.

 

[SouthernBornRebel]

hold the ESC button until the dash EVIC reads ESC DISABLED then it's a true 4x4 lock

 

[danielmid]

hold the ESC button until the dash EVIC reads ESC DISABLED then it's a true 4x4 lock

I have tried this a few times and it doesn't do anything no matter how long I hold it down. 2015 1500.

 

[RamDiver]

Check this post to disable ESC.

Disabling ESC

Put it in 4hi and hold the traction control button for like 10 seconds and then it should display that the ESC is disabled. I tried this and when i switch it back to 2wd it seems to go off each time

www.ramforum.com

 

[RamDiver]

I have tried this a few times and it doesn't do anything no matter how long I hold it down. 2015 1500.

This does work as described on my '21 Classic Warlock. After holding the ESC button for about 6 seconds, with the 4x4 Lock engaged, you hear a ding and the message below pops up.

This truck has the LSD option, I'm not sure if that makes any difference.

 

[ram1500rsm]

A lot of people up their trucks in 4low when stuck in snow..."Better throttle and wheel speed control". However, it you read closely this also disengages just about everything including the BLDS........

It doesn't. BLD works in 4hi or 4lo. 4lo disables the traction control crap that will cut power to the wheels when the whees start spinning. is supposed to partially of when you disable the tc off via the switch and fully disabled when you go to 4low, but that doesn't disable the BLD system.