Would you rather have 3.21 + LSD or 3.92 w/o LSD?

[zeus2120]

Howdy everyone,

So thanks for all the feedback on my other thread helping me make a decision on a model. Laramie it will be.

Now -- here is one more question where I'd truly love feedback. Two Laramies to choose from: which do you choose? All things equal except-

1.) Geared 3.21, Anti-spin differential
2.) Geared 3.92, Conventional differential

I know there is a lot of love on here for the LSD but it seems there is equal love for the 3.92. Well, if you could only have one, which in my case I can only have one, which would you rather have? Offroading will be minimal. Possibly some dirt roads and light mud when I head to our cabin in the country. I have 4 - 5 months of snow to deal with. Do I go for the LSD or for the fun factor of the 3.92? I'll be purchasing a leftover 2015 and don't want to order a 2016 because of price.

 

[noupf]

wait, the 3.92 comes in both configurations? I thought if you have the 3.92 you got the lsd.

My two cents is this......3.92 or bust, who cares about the lsd if you have 4wd.

the main reason i went 3.92 is bc i do about 65% of slow around town driving and only about 35% highway. I wanted the 3.92 gearing to help me go from low speeds or stops up to crusing speeds. Even with the 3.92's i get almost 20 mpg on the highway.

If you do mostly highway driving, the 3.21 is fine, but even then i would have gone with the 3.92. Start and stop around town driving.....3.92 all the way

 

[zeus2120]

wait, the 3.92 comes in both configurations? I thought if you have the 3.92 you got the lsd.

My two cents is this......3.92 or bust, who cares about the lsd if you have 4wd.

the main reason i went 3.92 is bc i do about 65% of slow around town driving and only about 35% highway. I wanted the 3.92 gearing to help me go from low speeds or stops up to crusing speeds. Even with the 3.92's i get almost 20 mpg on the highway.

If you do mostly highway driving, the 3.21 is fine, but even then i would have gone with the 3.92. Start and stop around town driving.....3.92 all the way

Yup, I'm looking at the build sheet and see no anti - slip on the 3.92 but it's on the one with the 3.21. Thanks for sharing your MPG numbers. I think I'd be about the same.. 65%-70% city and 30% highway to work and on weekends. With your 20mpg highway, what speed do you normally drive? Here I'm usually going 65, 70, or 75 if I'm on I-80. I basically stick to those 3 figures based on the speed limits.

 

[noupf]

Yup, I'm looking at the build sheet and see no anti - slip on the 3.92 but it's on the one with the 3.21. Thanks for sharing your MPG numbers. I think I'd be about the same.. 65%-70% city and 30% highway to work and on weekends. With your 20mpg highway, what speed do you normally drive? Here I'm usually going 65, 70, or 75 if I'm on I-80. I basically stick to those 3 figures based on the speed limits.

i cruise around 70....anything more and the mpg goes down.

 

[TRCM]

With traction control these days, LSD is not really necessary for the driving most people do.

 

[iam_canadian22]

Ill never buy a truck without lsd again, but if those are your only 2 options and if you plan to tow haul offroad or upsize tires id say 3.92 and the lsd can be intalled later on for cheaper then regearing if your 4x4

 

[dearchristopher]

I have LSD in my 2wd truck and granted I don't get goofy in it, I love it. I was yanking my camper out of storage the other day and had to stop with one tire in a sloppy and muddy hole filled with water and put the camper on the hitch. when I got back to easing it out, it slipped for a second, and the other wheel caught and pulled me out. I thought for sure I would have a headache getting it figured out but it did ok. I have 3.55 so I don't know about 3.92 life but I imagine its nice. I had 4.10s in my ls2 suv before this and that truck felt stronger from a dig than my stock ram does, but for whatever reason my ram will pull like a freight train even with a trailer behind it from 25mph up once it gets out of torque management

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[xrsman]

I'd go 3.92 without if I had that choice

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[MADDOG]

If I was towing large I'd go with the 3.92 but are you sure the 3.92 is not an LSD?

 

[zeus2120]

If I was towing large I'd go with the 3.92 but are you sure the 3.92 is not an LSD?

The build sheet says conventional for both. Any chance the 3.92 conventional is actually an lsd?

 

[Selcher]

If I had to choose, it would definitely be the 3.92 rear end... installing the Anti Spin wouldn't be that hard and the dealer could probably do it for a phenomenal fee...

 

[preachp]

Hi Op,
If you are wanting the 3:92 then get those. If you have the need for LSD afterwards you can add that for a few hundred bucks. A gear change on these things is EXPENSIVE. So ultimately if you think you will need or use the 3:92 go that route. If you think mileage and extra pull is important then go 3:21. I have a 6 speed with 4X4 and 3:55 LSD and while some say it doesn't make much difference, it actually makes a lot of difference. When my truck starts pulling with three wheels it is ridiculous! Would not have it without. But again like I said if you will need that 3:92 itr is a lot cheaper to convert to LSD than it is to change the gearing in these trucks.
Good luck with your soon to be new truck,

preachp

 

[QwikKota]

It should say if it has the Anti-Spin clearly on the window sticker and by searching the VIN with the link below:

http://www.dodge.com/webselfservice/BuildSheetServlet?vin=1C6RR7VT2FS602105

That is an example truck, in the standard equipment it will say conventional and then towards the bottom where the options are it will say Anti-Spin.

I would prefer the 3.92's but without the LSD that would be a real tire killer on the one side that is getting power. I don't think you can just throw in an LSD without redoing the gear lash etc. That being said I would take the 3.21 with LSD if those were my two ONLY choices.

 

[zeus2120]

Hi Op,
If you are wanting the 3:92 then get those. If you have the need for LSD afterwards you can add that for a few hundred bucks. A gear change on these things is EXPENSIVE. So ultimately if you think you will need or use the 3:92 go that route. If you think mileage and extra pull is important then go 3:21. I have a 6 speed with 4X4 and 3:55 LSD and while some say it doesn't make much difference, it actually makes a lot of difference. When my truck starts pulling with three wheels it is ridiculous! Would not have it without. But again like I said if you will need that 3:92 itr is a lot cheaper to convert to LSD than it is to change the gearing in these trucks.
Good luck with your soon to be new truck,

preachp

Thanks preachp. I have no need for the 3.92 at all. But, after reading so many threads everyone seems to love the 3.92 for the acceleration and city mpg. For what its worth, the 3.92 non lsd is $2,300 cheaper than the other laramie I'm looking at. (Lacks other options like sunroof)

 

[zeus2120]

It should say if it has the Anti-Spin clearly on the window sticker and by searching the VIN with the link below:

http://www.dodge.com/webselfservice/BuildSheetServlet?vin=1C6RR7VT2FS602105

That is an example truck, in the standard equipment it will say conventional and then towards the bottom where the options are it will say Anti-Spin.

I would prefer the 3.92's but without the LSD that would be a real tire killer on the one side that is getting power. I don't think you can just throw in an LSD without redoing the gear lash etc. That being said I would take the 3.21 with LSD if those were my two ONLY choices.

Ran the vin and sure enough it's conventional. No anti-spin anywhere on there. I'd hate to be "that guy" with the one tire burnout happening. But, I don't know what to do. That's why I'm here

 

[QwikKota]

Ran the vin and sure enough it's conventional. No anti-spin anywhere on there. I'd hate to be "that guy" with the one tire burnout happening. But, I don't know what to do. That's why I'm here

If it's a 2015 and a great deal I say go for the 3.21 LSD. I was not happy with mine as it's slightly heavy with the CC and 6' bed but after a 500 mile road trip I am ok with that setup. If you are saving more than $2k over a 2016 which you surely will, it is worth it to get the 3.21 truck and see how you like it. You can always swap it later with the savings and still be $1k ahead. I would think the 3.92's would get frustrating quick especially if you are in a wintery climate.

On the other hand if you are looking at 4WD trucks, definitely get the 3.92 truck and get the LSD put in later. On those the gears are more or less a permanent part of the front diff.

 

[TRCM]

Ran the vin and sure enough it's conventional. No anti-spin anywhere on there. I'd hate to be "that guy" with the one tire burnout happening. But, I don't know what to do. That's why I'm here

Like I said earlier...you'd have to try to do that, as the traction control works very well to give you traction to both sides.

 

[HemiPower36]

3.92

 

[GP4L]

Ran the vin and sure enough it's conventional. No anti-spin anywhere on there. I'd hate to be "that guy" with the one tire burnout happening. But, I don't know what to do. That's why I'm here

Traction control on all vehicles cut torque and/or use the ABS to reduce wheel spin. LSD doesn't work that way. And without LSD, in 4x4 you can still be effectively "2wd" (one wheel slip in front and one wheel slip in back) if you're in some really slippery stuff (however you probably have other problems at this point)

Get the 3.92 IF it fits your driving conditions. Add the LSD later, especially if you like to hammer it off the line. There's nothing cool about saying to the guy next to you "hold on a sec, I need to put it in 4wd first."
Talk to Moe's. I had this dilemma for a while and looked into it, well under $1000 installed, parts/labor. Then a truck I liked, with LSD, popped up for sale, I bought that, and love it. But I would prioritize the other options you want first.

 

[zeus2120]

Traction control on all vehicles cut torque and/or use the ABS to reduce wheel spin. LSD doesn't work that way. And without LSD, in 4x4 you can still be effectively "2wd" (one wheel slip in front and one wheel slip in back) if you're in some really slippery stuff (however you probably have other problems at this point)

Get the 3.92 IF it fits your driving conditions. Add the LSD later, especially if you like to hammer it off the line. There's nothing cool about saying to the guy next to you "hold on a sec, I need to put it in 4wd first."
Talk to Moe's. I had this dilemma for a while and looked into it, well under $1000 installed, parts/labor. Then a truck I liked, with LSD, popped up for sale, I bought that, and love it. But I would prioritize the other options you want first.

It's really down to just the gearing and the LSD for me. I just don't know which combo to choose. I'm good with everything else. Don't need the 3.92 at all -- I'll never be towing or lifting my Ram. But, it seems from the forum that they're awesome to drive. Although it doesn't have the LSD, it's $2,300 cheaper than the other model.

On the flip side, the other one is more expensive and "slower", but has the LSD. Decisions decisions!