2006 Ram 1500 rear axle differences

john p f · Dec 27, 2017

need to replace the rear differential on an 06 hemi 2x4 quad cab. The cross reference salvage book says there are 2 different axle housings. Round or square outer flanges. Is there actually any real difference if you replace The Whole thing??
392:1 gear.

lharrell79 · Dec 27, 2017

Yes, it matters, in how the brakes mount to the axle. You need to determine if you have square or round flanges, and stick with what you have.

john p f · Dec 27, 2017

Nice illustration. Thanks. I think someone stuck the round one in mine right before I purchased it and I am not sure which it originally had. It barley made it home. Had to dump motor oil in it half way home and pinion is loose now. Makes amazingly horrible noises. Thought for sure I was going to be using AAA. The salvage yard only has the square flange one with the 3.92 posi. And it’s actually out of a 2006. But it includes everything including brakes. Any chance it works?

Joes1500 · Dec 27, 2017

If it comes complete with the brakes, then I would assume it would be a simple swap.

john p f · Dec 27, 2017

Of course I can compare them side by side an measure everything to compare. But, It’s a drive for me to anywhere.

lharrell79 · Dec 27, 2017

john p f said:
Nice illustration. Thanks. I think someone stuck the round one in mine right before I purchased it and I am not sure which it originally had. It barley made it home. Had to dump motor oil in it half way home and pinion is loose now. Makes amazingly horrible noises. Thought for sure I was going to be using AAA. The salvage yard only has the square flange one with the 3.92 posi. And it’s actually out of a 2006. But it includes everything including brakes. Any chance it works?

If it comes with everything (down to the calipers and rotors), then yes, it should swap right in. It would be a matter of disconnecting the driveshaft, u-bolts, brake lines, and e-brake. Pull the old one out, and slide the new one in.

john p f · Dec 27, 2017

Cross checking that my truck did indeed come with anti spin differential rear axle. The rear differential looks recently installed but is an open one legged one.

lharrell79 · Dec 27, 2017

john p f said:
Cross checking that my truck did indeed come with anti spin differential rear axle. The rear differential looks recently installed but is an open one legged one.

https://www.ramtrucks.com/webselfservice/ram/index.html

Click the link above.
Click "equipment listing" on the left side of page.
Enter your VIN.

This should give you your trucks factory equipment listing.

07hemi4x4bighorn · Jul 21, 2018

Great conversation! Would this be an example of square rear axel flange? Fyi, it’s a 2007 5.7 4x4 Bighorn w/ 160,000 that’s already had the rear end replaced once... and about to be again. It’s also had the tranny done and the half shafts. Wife keeps asking how much I’m putting into it. I tell her I have to make it run again!

07hemi4x4bighorn · Jul 21, 2018

The reason I ask, is because I personally don’t know by looking hw to tell the difference between round and / or square brake flanges. Fyi, the vin decoder on Dodge’s website spit out a great pdf of the equipment list. It listed 3.92 gear ratio for the back axel.

SYKRAMMAN · Jul 21, 2018

07hemi4x4bighorn said:
The reason I ask, is because I personally don’t know by looking hw to tell the difference between round and / or square brake flanges. Fyi, the vin decoder on Dodge’s website spit out a great pdf of the equipment list. It listed 3.92 gear ratio for the back axel.

Yes, that’s a square axel flange.

07hemi4x4bighorn · Jul 22, 2018

Thank you for the info! I now see the “flange” for sure! I’ve outlined the square in red marker for any other novices out there like me who want to know. - thanks again sykrammen!

Jens06Ram · Jul 27, 2018

I am glad I signed up and found this thread. I have horrible sounds from my rear axle and have for some time so I rarely drive it, but my problem is I am not sure the rear end is original and have been doing my research to find out if it is 3.55 or 3.92. This thread answered my square or round axle flange. Mine is round. I do not want to put the wrong ratio axle in it but I Dodge and they told me there should be a 3.92 in here. I have no tags on either axle, I have vin decoded, nothing!
How do I tell which axle ratio is on the front so I can match the rear?

Jens06Ram · Jul 27, 2018

I have already ruled out ujoints, axle shaft, replaced rotors, etc. I took off the rear differential cover and found metal slivers plus the gears must be lightly scraping the inside of the diff cover!! Ouch!! I also have a little play in the bearings behind the housings on each side. Ugh I need answers, lol.

SYKRAMMAN · Jul 28, 2018

Jens06Ram said:
I have already ruled out ujoints, axle shaft, replaced rotors, etc. I took off the rear differential cover and found metal slivers plus the gears must be lightly scraping the inside of the diff cover!! Ouch!! I also have a little play in the bearings behind the housings on each side. Ugh I need answers, lol.

Oh boy, the infamous scratches on the inside diff cover. Time for a rebuild.

Ian_Olivas · Jul 30, 2018

SYKRAMMAN said:
Oh boy, the infamous scratches on the inside diff cover. Time for a rebuild.

Yeah I remember when I discovered mine a year ago. Glad I finally rebuilt it and I just did a second rebuild on my 03 rcsb because those gears didn't even catch each other lol

Ian_Olivas · Jul 30, 2018

Jens06Ram said:
I am glad I signed up and found this thread. I have horrible sounds from my rear axle and have for some time so I rarely drive it, but my problem is I am not sure the rear end is original and have been doing my research to find out if it is 3.55 or 3.92. This thread answered my square or round axle flange. Mine is round. I do not want to put the wrong ratio axle in it but I Dodge and they told me there should be a 3.92 in here. I have no tags on either axle, I have vin decoded, nothing!
How do I tell which axle ratio is on the front so I can match the rear?

So the easiest way to figure out what your ratio is, is to count the teeth on the ring gear and then count the teeth on the pinion gear and divide the teeth on the ring gear by the teeth on the pinion gear. That will give you your diff gear ratio currently in your truck
Ex. My ring gear has 41 teeth and my pinion gear has 9 teeth so 41/9 and then I get 4.55555 so my gear ratio is 4.56:1

Jsnplante · Jul 23, 2021

john p f said:
Of course I can compare them side by side an measure everything to compare. But, It’s a drive for me to anywhere.

View attachment 116710

View attachment 116711

So is this a round one then?

Fast69Mopar · Jul 23, 2021

Jsnplante said:
So is this a round one then?

Yes, the pics you posted are from a round flange 9.25" Corporate Axle.

Dodge_this · Aug 1, 2021

Replacing rear end 06 1500 2x4 4.7 and everything I find ask if it is.( round with flat top and bottom brake mounting flange) or (square brake mounting flange)?

2006 Ram 1500 rear axle differences

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