6.7L Cummins Forum

So let me see if I have this right. The 2007 and newer 3500 DRW (Dual Rear Wheel) trucks have the 10.5 inch ring gear and the SRW (Single Rear Wheel) has the 11.5 inch? If this is true then do the 2500's also have the 11.5 inch ring gear too?

I do know that all the front differentials are 9.5 inch.

I can't find anything that says this is true on my truck. The sticker that was on the window does say limited slip but that's it and I can't find anything on the truck itself.

Anyone have a handle on this?


Thanks!

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10

All right, after a lot of reading this is what I found out. (Sure glad I didn't order that 10.5" cover from PML.


Ram 3500 series pickups feature reduced spring rates for unloaded and lightly loaded conditions to improve ride quality. To support the heavier payloads and towing demands of a 3500, an auxiliary leaf spring setup was created. The auxiliary springs are only employed when the truck is heavily laden, providing improved unladen ride comfort.
All-new rear axles (10.5 inch ring gears on 2500 models and 11.5 inch ring gears on 3500 and 2500 diesel/manual models) contribute to increased gross vehicle weight ratings, with a best-in-class rating of 12,000 pounds on the 3500 Diesel/4x4. The standard rear axle ratio is a 3.73 with a 4.10 ratio available as an option and provides an additional 2,000 pounds of towing capability. Dodge Ram 3500 rear axles have a GAWR of 9,350 pounds.
A new limited slip differential is available on Ram Heavy Duty. The helical gear design provides torque biasing and eliminates the "chatter" found in friction plate designs. The system requires no lubricating additives. On two-wheel drive Dodge Ram Heavy Duty pickups, new front suspension geometry delivers caster, camber and toe patterns that remain consistent throughout the full range of travel.

So it looks like I was wrong in my first post and what I saw was a typo. The truth is when I saw that the 2500 had a larger ring gear it didn't make a lot of sense to me but hey, lots of stuff confuses me any more and I'll find out for sure when I replace my rear cover.

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10

When I ordered my new cover from PML here's what they said about how to visually tell which rear end you have.

Squid,

Starting in 2004 1/2, every Ram with the diesel got the AAM 14 bolt 11.5". Take a look at the shape of your stock cover and then compare to what you see on our website. The perimeter of the 11.5" cover comes to a point at the top and bottom. The 10.5" (used on earlier, lower power diesels) has a flat top & bottom
http://www.yourcovers.com/dc_10361.shtml

Regards,

Brent Lottman
PML Inc.
800-335-4345

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10