I'm trying to buy a limited slip unit for my 09 Sport but can't get confirmation from anyone (dealer, shop etc) about the rear axle on the latest Ram 1500...is it a standard 9.25, 31 spline, 12 bolt Chrysler unit or some other?

 

From what I understand the rear axles come in 4 flavors: 3.22, 3.55, 3.92, and 4.10. The 3.22 is on the base models and the non-5.7 Hemi SLTs and TRXs. The 3.55 is the standard for 5.7 Hemi engine. The 3.92 is an upgrade option on the 5.7 Hemi. And lastly, the 4.10 is only available on the R/T.

As for the 9.25, I'm not sure what that is, but it seems just a tad high for an axle ratio.

 

Sorry for the confusion...and I also forgot to intro myself before my first question post

I am the proud owner of a 2009 Ram 1500 Sport 4x4 with numerous mods and I'll post photos soon. My truck has the 3.55 gear.

What I'm asking is: Does the 09 Ram 1500 have the old standard "vanilla" Chrysler rear end with 9.25" diameter ring gear, 31 splines, 12 bolts, etc...because if so, I can get just about any brand limited slip unit to bolt up as long as it fits that rear end.

OR...since Chrysler uses American Axle now instead of Dana...is the rear axle different and therefore require a different differential fit?

Thanks for any help...

 

It's not an axle ratio. The Chrysler 9.25" is an axle, similar to the Dana 30, 35, 44, 60, the Ford 8.8", or the Chrysler 8.25" (among many others).

To the OP: I've not heard of any differences. I'd be interested in finding out as well, though - got a Detroit and 4.56's in my future, would be nice to figure out any snags beforehand.

 

from what i was told it is the light duty 9.25 chrysler rear

 

It's a 9.25 standard chrysler axle, biggest you can go is 4.56 and theres quite a bit of different LSD's you can choose from

 

Thanks guys! I'm sticking with the 3.55 and probably just go with a Mopar OEM unit to maintain warranty. Don't go off-road (on purpose anyway) and just looking for better wet road handling/dry road acceleration. Single wheel drive sucks!

 

and just looking for better wet road handling/dry road acceleration. Single wheel drive sucks![/quote]

I have the 3.92's with the factory locker in mine and I have noticed that my traction in the rain and really good. I do not have the Monster Hemi but I am happy with the factory locker.

 

Ah, so the 9.25 is a Chrysler axle. Good to know. I'm a Dodge newbie, so I'm still learning the ropes of products.

My Sport has the 3.55. How easy would it be to upgrade it to the 3.92 LSD or something within that range? Can you change the gears out without swapping the whole axle? Lastly, is that something the Dodge dealer could do, or do I need to find an aftermarket shop?

 

Yukon and Genuine Gear both make 4.88s for the Chrysler 9.25 axle. The catch is, that option is only available for 2WD trucks, as nobody makes anything larger than 4.56 for the front pumpkin.

To answer your question War Horse, you can change out gears and diffs without changing the entire axle. Certain Dodge dealerships will change out your gears, but usually will only do it for available factory ratios, and likewise most will only install a Chrysler "anti-spin" LSD. If you want aftermarket parts, the dealer will most likely not touch it, and you will need to find a performance or off-roading shop such as 4 Wheel Parts.

And just throwing my $0.02 out there, avoid the factory LSD. If you are serious about upgrading go to shop that does that kind of work, and get good gears in your desired ratio, and put in an Auburn LSD or Detroit Tru-Trac. Genuine Gear, Yukon, and Motive all make quality gears for the 9.25" axle. I recently swapped my 3.92s and stock LSD for 4.56 gears and an Auburn, and that was easily the best mod I've done to my truck and worth every penny.