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Old 09-10-2013, 12:18 PM
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brandonjansen brandonjansen is offline
Lifted Cummins Fanatic


 
Join Date: Feb 2013
Location: Abbotsford, BC, Canada
Age: 22
Posts: 5,496
Gender: Male
Vehicle: 2012 Dodge Ram 3500 CCSB 4x4
Trim Level: Laramie Limited
Color: Mineral Grey Metallic
Engine: 2011-20?? 409ci (6.7L) Cummins Turbo Diesel 350hp 800lb/ft
Rep Power: 7
Rep:1946
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As others have mentioned the size of the wheels has nothing to do with the gear ratio. It has to do with the trim level of your truck. The more basic trim levels come with the smaller wheels and tires since they are cheaper.

You won't have any clearance issues running the bigger wheels and tires. Your suspension set up is exactly the same as a stock Ram that came with the 20's and 33's. But you will need to get your speedo reprogrammed in order to keep it and your odometer correct. The dealership should be able to do that for you no problem. You will also notice slight power loss stepping up to the larger tire but it will be very minimal.

Where are you getting the OEM 20's from? Are you buying them new? Online? Trade? The one thing you will want to be sure of there is that the TPMS sensors are correct for your truck. The frequencies of the sensors change over the years so you will need to make sure they are compatible with your 2012.
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2012 Ram 3500 Laramie Limited Cummins Build Thread
8" BDS Long Arm Lift with Fox 2.0 Shocks | Dual Fox 2.0 Steering Stabilizer | 37x13.5 Toyo MT's | AMP Powersteps & Bedstep | Bakflip G2 | Mag-Hytec Rear Diff Cover
EST 500 hp/1268 ft-lbs at FW | H&S MiniMaxx Custom Tuned | 4" Flo Pro Stainless TBE | Sinister EGR Delete | ARP 425 Head Studs | 4.56 AAM/Yukon Gears | S&B Intake w/ Scoop
Guide to Leveling & Wheel and Tire Sizing for 06+ 4wd Ram 1500's
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