Rear differntial

ramoutdoorsman · Sep 17, 2017

I have a 2012 ram 2500 with the 5.7 hemi. My manual says rear diff is a limited slip but does not require an additive. Why is this?

JPT · Sep 17, 2017

I believe 2500’s have a gear driving Limited Slip, unlike us 1500 guys. The clutches need the friction modifier, gears dont.

Gear driving LS are way better (do not wear out, and will not slip under heavy load), be glad!

spoon059 · Sep 18, 2017

The Ram doesn't use a "real" limited slip. They use independent braking of the wheel that is slipping, rather than clutches in the rear diff.

Wild one · Sep 18, 2017

spoon059 said:
The Ram doesn't use a "real" limited slip. They use independent braking of the wheel that is slipping, rather than clutches in the rear diff.

Better do some more research,the limited slip in the 1500's is a clutch style posi/limited slip.You're thinking of traction control,which is differant from what a limited slip does.

Kingsize · Sep 18, 2017

ramoutdoorsman said:
I have a 2012 ram 2500 with the 5.7 hemi. My manual says rear diff is a limited slip but does not require an additive. Why is this?

Google Gleason Differential, you will get the answer you need.

Jeepwalker · Sep 18, 2017

Viscious coupling??

If so, those are great! Our Jeep has them front/center/rear.

Burla · Sep 19, 2017

If you use a premium oil you likely wont need additive. Read here, you only use if you have chatter. I can't remember how many guys have changed their dif fluid, so far none have needed the modifier. You do not want to add it if you don't need it, that can be bad.

ColdCase · Sep 19, 2017

Its a gear type diff in the 2500 of that era. No clutches no additives needed. There is a pretty good description around here somewhere. Lots of advantages but the biggest disadvantage is that it needs some traction to work. Lift one rear wheel off the ground and you go nowhere, nothing gets transferred to the other wheel.

GsRAM · Sep 19, 2017

What style posi do the new 2017s have? My truck has the anti spin diff, but i don't know much about it. Thanks

Kingsize · Sep 19, 2017

GsRAM said:
What style posi do the new 2017s have? My truck has the anti spin diff, but i don't know much about it. Thanks

Kingsize said:
Google Gleason Differential, you will get the answer you need.

ttt

spoon059 · Sep 26, 2017

Wild one said:
Better do some more research,the limited slip in the 1500's is a clutch style posi/limited slip.You're thinking of traction control,which is differant from what a limited slip does.

Oops, my apologies. The 2500's use braking, I thought the 1500's did as well.

Tach_tech · Sep 26, 2017

spoon059 said:
Oops, my apologies. The 2500's use braking, I thought the 1500's did as well.

They all use braking to improve traction when wheels are spinning. The 1500 has a clutch style limited slip while the 2500/3500 use a gear style limited slip. Both do the same thing just in slightly different ways. All ram trucks have a limited slip rear diff as an option.

Ram Night · Oct 15, 2017

GsRAM said:
What style posi do the new 2017s have? My truck has the anti spin diff, but i don't know much about it. Thanks

If you have a 1500, you have the ZF rear end and the limited-slip differentials have clutch packs behind the side gears inside the diff.
Here is a photo I took of a open diff on the left, and a SL unit on the right when I replaced the open diff with a LS unit in my 16 Rebel.

Rear differntial

ramoutdoorsman

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