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  1. J

    An Engineer's Ultimate Guide To 3.21 VS 3.92 Axle Ratio

    Man this thread got out of hand. 😅
  2. J

    Our First Look At The All-New Twin-Turbo 3.0-liter GME-T6 Inline-Six Engine!

    The HEMI is one of the more reliable engines out there. I am concerned about this I-6 twin turbo's longevity. Unlike Toyota's and Ford's engines, this engine does not appear to have dual injection where both port injection and direct injection are present. Ask any mechanic and they'll tell...
  3. J

    An Engineer's Ultimate Guide To 3.21 VS 3.92 Axle Ratio

    No we're talking about stock truck with vs without air suspension.
  4. J

    An Engineer's Ultimate Guide To 3.21 VS 3.92 Axle Ratio

    0.6 inches lower results in drag coefficient from .457 - > 0.357? Is the air suspension made of snake oil? That math does not add up. 0.360 is F-150's drag coefficient without any air suspension. https://www.motortrend.com/news/2015-ford-f-150-is-most-aerodynamic-f-series-ever/ .45 is like a...
  5. J

    An Engineer's Ultimate Guide To 3.21 VS 3.92 Axle Ratio

    While that is true when roads are perfectly flat, in reality roads have constant incline and decline sections. While maintaining a fixed speed in the real world, the greater the weight the higher the fuel cost. A few cm lower ride height is not going to off set the weight gain. You can easily...
  6. J

    An Engineer's Ultimate Guide To 3.21 VS 3.92 Axle Ratio

    The ride height adjustment offset to aerodynamic drag is minute compared to added weight.
  7. J

    An Engineer's Ultimate Guide To 3.21 VS 3.92 Axle Ratio

    1. Heavier trucks suffer more rolling resistance. 2. Even when eliminating acceleration from a stop, roads are not perfectly flat and there are constant incline and decline sections in which the engine will burn extra fuel to maintain speed, and the heavier the truck the more fuel it burns.
  8. J

    An Engineer's Ultimate Guide To 3.21 VS 3.92 Axle Ratio

    Anything that adds mass is going to decrease fuel economy. 4X4, air suspension, off-road group, and other options will decrease fuel economy. Rated fuel economy is rated with 4X4 and 4X2 with 3.21 and no options(3.92 counts as "premium" axle and not required to be rated in EPA rating).
  9. J

    vs. 2021 F150

    I hope UConnect 5 comes out before the year's end.
  10. J

    Switching from 3.92 to 3.21...

    The EPA rating is tested on a 3.21 rear end. 3.92 is an at-cost option and thus not required to be in the EPA rating testing. Frankly 3.21 and 3.92 costs FCA the same, and 3.92 is an at-cost option for the purpose of getting a better EPA rating. Fun fact, the reason auto start stop is on by...
  11. J

    vs. 2021 F150

    I think the infotainment system on the 2021 F150 is much better, and they kept all the physical nobs and buttons!! It seems like Ford will join BMW to be the only two companies that supports wireless Apple Carplay. The generator seems like a great option for going car camping. Those two...
  12. J

    What Really Grinds My Gears

    DO NOT BUY IT. There is no reason to buy ANY Trucks without at least 10k discount.
  13. J

    Air conditioning Hack

    Has anyone contacted FCA leaderships? You can look them up on FCA page and find them on Linked in or twitter. https://www.fcagroup.com/en-US/group/governance/management/Pages/default.aspx
  14. J

    An Engineer's Ultimate Guide To 3.21 VS 3.92 Axle Ratio

    I think I calculated the gear ratio based off the older 8HP70 trans. Good to know they have a wider gear ratios in the newer one.
  15. J

    Air conditioning Hack

    Thanks man
  16. J

    Air conditioning Hack

    Literally waiting for FCA to fix this to pull the trigger around Christmas. If this is still and issue for 2021 models then I'll either wait for 2022 or get a Ford. I would have pulled the trigger sooner had this issue never existed.
  17. J

    Poor gas mileage

    Most likely cause is the weight. Off road package also comes with 1 inch lift and skid plates add weight. Air suspension adds weight, and 3.92 reduces MPG at highway speed. Even E torque adds weight. My guess is that the added weight should be between 200-400 lbs, and when you add 3.92 into...
  18. J

    Why Rams still have a reputation for poor quality

    Known issues reported by owners on this forum: 1. Widespread A/C blend door issue. A/C is mixing with heat, and vents get different temperatures and is generally 10-15 degrees higher than normal A/C. 2. 2019 rear window crack and leak, I think the suppliers fixed it in 2020. 3. Whistle wind...
  19. J

    Coming back to RAM... though with a rebuilt title.... thoughts?

    You're always taking a chance with with rebuild. I would not do it. $61,000 MSRP doesn't mean much. During Christmas time, you can get close to 9000 off from the factory, and if you add dealer incentives anywhere from 7-15k(if they really need to beat their quota and it's the end of the...
  20. J

    Whistling noise

    Man, a hole in the floor. That is nuts. How is the cabin floor not sealed from the factory? Is it production defect or design defect?
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