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Stupid things first. Did you verify all wheels and tires are the exact same size? (It's not impossible for the tire shop to mix up one tire) Less stupid things second. How big is the wheel offset? Could it be that the scrub radius has changed enough to affect the parameters that the VSC...

Splain yoself Also, welcome to the forums!

They're wrong, and just selling you oil in their best interest, not yours. However, there's nothing wrong with using the conventional oil either. What's wrong is saying one NOT the other.

Have a tire shop swap the tires around so the white letters face inward. If you're that worried about the appearance, then you won't be satisfied with markers and paint.

Answer the questions about your trailer plans and your truck and we can literally do the math together, no estimating or guessing involved... Are you sure the Harley is 900 lbs curb weight? Year, Make, and Model will help us tell you the proper numbers.

Maybe those numbers are for Half Ton trucks in general, but "Crew Cab" 4x4 DT trucks max out at 1840 as advertised by Ram.

Glad you're ok, I just had a similar experience where a Jeep Liberty lost control on the highway in the lane to the right of me, and even though I tried to avoid it, she hit me in the front corner and then rear door.

A crew cab DT truck will have a payload between about 1,000 and 1840 lbs. Each truck will be different, however, due to it's option content, and therefore weight. Payload is GVWR - Curb Weight. So a 4x4 with a 5500 lbs curb weight will be 7100-5500 = 1600 payload. It's on every trucks door...

You're right, and wrong, and so is everyone in this thread. When speed is static, and the transmission gear is the same, the 3.92 trucks rev 22% higher than a 3.21 truck. When rpm is static and the transmission gear is the same, the 3.92 trucks don't have to work as hard to accomplish the same...

I don't see the page that you screenshot-ed for some reason. I can get to the Feature Guide but it looks slightly different. (At least on my end)

Can you post your vehicle loading sticker? (On the inside of your drivers side door, there's a white, red and yellow sticker with the tire info on it and a line that says "the combined weight of all occupants and cargo may not exceed X,XXX Lbs) Also, what is the year, make, and model of the...

What's the equations for lifespan in regards to rpm given that friction and load are equal and static? I'm sure as you know, you lose honestly as you increase simplicity. Noting in life is simple, especially not in Engineering. This isn't a black and white scenario. And it's just as dishonest...

Where did you find that!?!?

Pretty sure that data sheet from ZF is wrong, maybe it was translated incorrectly. I think it was supposed to be a comparison chart between the two trans, however, they copied the data set to both sheets. Everything I've read elsewhere states the 8HP75 has the wider spread and deeper first gear...

I'll try and find it again. It was originally posted in the original 3.21 vs 3.92 thread, and I know I went and verified it myself as well before making this chart. The numbers are good, I'll see if I can get the proof for ya.

It's in the chart, 5.000:1 is correct.

Did you have the vent mix set to defrost or mix defrost? (Not the rear window defrost).

shorter gears also equal lower mechanical advantage though, so the assumed wear cannot be directly compared strictly based on rpm's / distance traveled. The amount of energy required to move the truck is the same regardless of gear ratio. How "hard" the engine is working to achieve that energy...

3.92 is 22% more than 3.21. If you're worried about MORE rpm's, you gotta do the math in the correct direction. Assuming the same transmission gear and same ground speed, at 2,000 RPM in a 3.21 truck, a 3.92 truck would run 2,442 RPM. However, your example regardless of actual percentage...

You can turn the Traction Control off in 2wd, and do all the burnouts you want. However, you cannot turn off the Vehicle Stability Control unless you are in one of the 4wd modes, (4A, 4H, or 4L). If you want to blow donuts in a 2019 Ram, pull the ABS fuse and have fun.