Diff howl under load now

It *is* a function of RPM. Torque goes up with RPM, at least in the range of RPMs we're talking about.

 

No.

1. POWER (the rate of doing WORK) is dependent on TORQUE and RPM.
2. TORQUE and RPM are the MEASURED quantities of engine output.
3. POWER is CALCULATED from torque and RPM, by the following equation:

HP = Torque x RPM ÷ 5252

If you would like to know more engineering and physics fundamentals, just send me a message. Open forum posts are not the right place for this.

 

does that apply to all HP calcs?
I know that equations from trade school haha. We use the same one for calculating electric motor HPs. Didn't know it was universal for all HP calcs

 

Thanks.

The only independent variable is the RPM. RPM is the only thing you can control directly -- via the gas pedal. Torque and RPM are not independent. Torque is a fixed function of RPM (for given gearing).

 

how do they hear it on lift?
Isn't it at 60mph?

 

Stethoscope is what they used for mine as well as bluetooth chassis ears on the road.

 

I can't imagine the dealer near me doing this lol.
For fuck sakes they can't even do an oil change without getting oil all over my skid plate.

 

You, by giving it the gas, control the POWER output from the engine. RPM is a resultant force and a function of power. To the poster above: This is a general HP formula and works with anything if you use HP as a unit.
Off topic a bit but here's a fun fact: HP and Torque will always be the same value at 5252 rpm lol
Take a look at any dyno run or torque/hp curve and see. #themoreyouknow

 

haha I remember how my instructor added beer to everything and when he explained the 5252 he was just like 'ya the guy who came up with this equation was sitting around having a beer and just figured 5252 was a good number to use with HP'

he did explain what the 5252 was really supposed to be from but all I remember was the beer. Same instructor came out after class with us to the bar when we finished trade school and got smashed with us haha

 

I had a PHYSICS III class while working on my engineering degree where the professor used Wile E. Coyote examples lol. Beer was always a given...

 

But you have time to post, bitch and rant here about it?

I'm not saying you don't have a problem. However I think they have tried to be helpful in solving it, already replacing 1 diff. Have you actually spoken to a service manager? If you haven't, I would be tomorrow, because you'll probably get further than bitching about it here, especially if they have already tried addressing your concern. They don't just replace rear ends for nothing, so by them doing so already shows you had a real issue. If you're having the same problem again, what can they really say now? Ask the service manager to get in contact with the local field rep and have them come out and drive your truck with you. If they won't make a special trip ask the service manager to get in contact with you the next time they are in town. You'd be surprised how often they come around sometimes. You'll get some type of answer, even if it's not the one you want to hear

 

ahaha, it really helps people grasp stuff. I know when I was doing a solar energy class we were talking about leading and lagging power. so inductive or capacitive and got into power factor etc.
One guy in the class who's still an apprentice didn't know what power factor was so asked what is it. and the instructor used beer to explain it.

said 'when it comes to power factor we want it higher so we don't pay as high of bills. So I always thought of it like this, an ELI circuit has voltage leading current which cost us more, so earns us a beer with mostly foam, so less beer. A ICE circuit has current leading voltage saving us money giving us a beer with little to no foam, so more beer'

 

Yes, I do. Especially at 9:30 at night on a Sunday when the dealership is closed.

I have an ongoing relationship with my service manager, corporate, and a regional field rep. My truck has spent days in their care and I've spent hours dealing with them. So yea, I can spare a few minutes to "bitch" on a forum...hoping that someone else has made more progress than me on an issue none of us should have to deal with.

 

and its that very reason I'd just pay to have it done by someone that knows what they're doing.
so much time is wasted on warranty claims trying to get them to do them.

Figure majority of the time you can't go after working hours (or at least not mine) and them not giving a rental means I can't get to work since I start too early for public transit. The work missed dealing with them adds up to more money lost than what it would cost to just do it right the first time.

 

Gears and a master install kit will not cost anywhere NEAR $1400 in parts... Maybe for both axles combined, but at the high end, maybe 1200.

Gear sets from Nitro or Yukon are ~$300 and a master install kit is around $350-400 depending where you buy it. So 600-650. But lots of places will sell a kit with gears and a master install kit for 500-550. OR if you buy an ARB, you dont need a full master install kit as they include bearings so you need shims and maybe pinion bearings, which can be had for like 100-150 depending on exactly what you need.

 

There have been at least one member here I’ve read, that after getting the diff replaced more than once, the noise went away when he replaced the tires.

The tires hit the ground not the diff, and they all make different noises during different wear stages and tire inflation pressures. That is also why they have noise ratings.

That said It’s unavoidable that some people will experience some type of manufacturing defect, and for those a R/R should solve the problem.

But if its that hard to check tires and adjust inflation pressures or believe they can make noise, I’ll just leave it at that.

Carry on.

 

What is the 5252 constant?

 

From James Watt's initial coining of the value of 1 horsepower

http://www.revsearch.com/dynamometer/torque_vs_horsepower.html

 

Just a number that makes the equation work with theses units. I like constants. You always know you will have at least one number right in a formula if you have a constant lol. Now Plancks Constant is just a headache though.