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3.21

  1. 2017 1500 Laramie w/3.21 rear end

    Towing
    So, I have been going back and forth, literally losing sleep over this first world problem. I'm looking at a 2017 Dodge Ram 1500 Laramie Crew Cab 4x4 with the 8 speed 3.21 rear end (payload 1510, max trailer weight 7,990). Our rig is a Keystone Cougar X-Lite 29bhs that comes in at 32.5 total...
  2. 2009 Ram 5.7 w/ 20" tires 3.21 rear axle tow capacity help.

    2009 Dodge Ram Forum
    If I could get some help trying to figure my towing capacity. I'm getting overwhelmed by all the different ratings. I have a 2009 Ram 5.7L 5 speed Crew Cab w/ 20" tires and unfortunately the 3.21 rear axle. My payload says 1503lbs and GVWR is 6800. I have tow haul feature with the towing...
  3. Reprogram speedometer after changing differential gears

    2014 Dodge Ram Forum
    Is it necessary to reprogram the speedometer after changing differential gears from 3.92 to 3.21. I just completed the swap and it seems my speedometer is correct. I don't have an easy way to judge, but traffic flow is steady. Also, with the 3.92 gears at 70mph I would tach almost 2,000rpm...
  4. Need advice on ring and pinion change

    Performance Mods - Engine - 5.7 Hemi V8
    I have a Ram 1500 Laramie 5.7 Hemi, 8 Speed RWD. Truck came with 3.92 gears. I would like to put in the 3.21 gears to improve mileage as I do hardly any towing. I cannot find the gears except from the dealer. ($781). Are there after market gear suppliers, if so who?. What are your thoughts on...
  5. 3.21 factory equipped gears change to 3.55?

    LD RAM - General Discussion
    Hi I purchased a 2014 Ram 1500 regular cab with the rear axle gears 3.21 I will haul a car and trailer maybe once per year most likely total weight 6500 lbs, unlikely but could hit up to 8000 lbs. The 3.21 are rated to 7000 lbs. If I find I am hauling over 7000 lbs, can I change out the 3.21...
  6. trying to buy but 3.21!!!!

    LD RAM - General Discussion
    Hey guys please help me out here. I'm trying to buy, well find and buy a 2013 ram 1500 sport 4x4 fully loaded with 3.92 gearing with low miles. I haven't found one yet!! They are impossible to find. So my question is.... Is it practical to buy a 3.21 and pay to have the 3.92s put in?? I got a...
  7. 35" tires with 8-speed & 3.21 gear ratio

    2013 Dodge Ram Forum
    35" tires with 8-speed & 3.21 gear ratio - is this a horrible idea? One shop said it has enough low end torque and will drop down to low rpms (ideal situation) on the highway so they said go for it. Wanted to get your opinions on this. Thanks!
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