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Old 09-09-2013, 09:05 PM
waves waves is offline
Dodge Ram Forum Newcomer
Join Date: Sep 2013
Location: Thunder Bay, Ontario
Age: 54
Posts: 3
Gender: Male
Vehicle: 2012 Dodge Ram 1500 Quad Cab
Trim Level: SLT
Color: Black
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 0
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Arrow Changing the original OEM 17" rims to OEM 20" rims

Hello, My 2012 Dodge Ram Quad Cab SLT 4x4 Hemi has the OEM 17" rims. 265/70R17 tires, 5x5.5" bolt pattern.
I would like to install OEM 20" rims and 275/60R20tires on the truck. I think the bigger rims look way better.
The 17" tires are 30.5" and the 20" are 33".

I think trucks with OEM 17 inch wheels are spec'd with 3.55 rear gear ratio.
Trucks with OEM 20 inch wheels are spec'd with a 3.92 rear gear ratio.
Can anyone confirm this?.
If the gear ratios are above I would lose some torque pulling a heavy load...but unsure how much.

I understand I should get the speedometer re-programmed.

Has anyone with OEM 17" rims on their truck gone up to the 20"?

Can I just go ahead and do this without any clearance or other issues?

If anyone could provide any advice let me know, Thanks! Dwayne
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