The building of knuckles

MTG said:
So I haven't driven her very much (approx 50 miles) but my initial impressions are as follows:

1) it shifts quicker through the gears. Particularly 1-3
2) it feels faster, though I haven't tried to gun it
3) it runs at lower RPMS while on a grade (this is one of the main reasons I regeared). 3500 rpm vs 5000+ on my drive home.
4) my Eco light is on more, but I think that's because I was trying to drive slower. ;)

Here is a shot at 70 mph, relatively flat grade, at approx 5400 feet elevation.
<img src="http://wayalife.com/attachment.php?attachmentid=12950"/>

~2800 rpm
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That is about exactly what my rpm's are at 70 too, but I have 4:88's. does this make sense or am I missing something. I have a 2012 auto with 37 km'2 which measure a little small.
 
Prime8 said:
...I think that a break-in time is a myth. Has the diff not seen enough cycles at 100 miles to cold-work these supposed high spots? My company is the world-wide leader in heat treatment and gears, and gears will attain their favorable properties during a carburizing heat treatment, NOT through cold working and cryo treatment. Gears are precision machined, there are very very very few "high points". Our heavy equipment doesn't require a 500 mile gear break-in time. As a matter of fact, our biggest equipment doesn't even get fully assembled until it gets to the customer...
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I will be the first to admit when I am wrong...
I spoke with the foremost heat treat/gear expert at my company about cryo and wear in time on gears. I was right about cryo; unless you have a high nickel alloy gear(like a jet turbine), recently (hours) after its heat treatment, you won't notice any improvement to the metallurgical properties from cryo treatment. However, he said that 500 miles is not unreasonable break-in on typical vehicle gears. While they are hardened, they typically don't have very good heat treatments and fairly lax tolerances compared to the gears we make at Cat. So there you have it, be gentle on your gears for the first couple hundred miles, you were right. I was wrong. Now I just need Cat to make me some gears for my jeep...
 
Cat to make me some gears for my jeep...[/QUOTE]

I've thought the same thing about my work as we do the transmissions for the ch-47 Chinook and the Apache.

2011 JKU 3.5 R.E. Longarm lift.
 
Prime8 said:
I will be the first to admit when I am wrong...
I spoke with the foremost heat treat/gear expert at my company about cryo and wear in time on gears. I was right about cryo; unless you have a high nickel alloy gear(like a jet turbine), recently (hours) after its heat treatment, you won't notice any improvement to the metallurgical properties from cryo treatment. However, he said that 500 miles is not unreasonable break-in on typical vehicle gears. While they are hardened, they typically don't have very good heat treatments and fairly lax tolerances compared to the gears we make at Cat. So there you have it, be gentle on your gears for the first couple hundred miles, you were right. I was wrong. Now I just need Cat to make me some gears for my jeep...
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Oh crap! :shock: Upon your advice I went bat shit crazy today with my rig today.

First, I cold started it and gunned it all the way to Starbucks at about 90 mphs. Second, I signed up for some drag racing at the local track...took 2nd. Third, tried out my lockers on dry pavement....chirp, chirp chirp. Fourth, thought I'd play a game of "drive home via the freeway in 4 low."

Guess I'm screwed! LOL!

I work with engineers everyday. Some of the smartest people I've met in fact. But I have to constantly remind them of work reality and reality reality. ;)

IMHO, like all things, the truth lies somewhere in the middle of what I've read. I don't have to drive 20 mph in 5 mile increments, allowing for cooling and I shouldn't race Gregor the Overlander in his Cobra. :cheesy"
 
Just wanted to come out and correct my previous statement. I hate the spreading of misinformation and did not want to be guilty of it myself.
 
And for the record, "engineering reality" would be "reality reality" if the damn shop guys knew the specs and followed the prints!!!

Sent from my ADR6350 using WAYALIFE mobile app
 
MTG said:
Oh, I understand it alright. In fact, I get paid to make sure everyone else can. ;)
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Haha, a nerd translator, huh? At Cat we call them "curriculum designers", my wife is one.

Sent from my ADR6350 using WAYALIFE mobile app
 
Prime8 said:
Haha, a nerd translator, huh? At Cat we call them "curriculum designers", my wife is one.
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Uh not quite. But I love how engineering geeks come up with those types of names. LOL!
 
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Looking great Mike! I think that the white corners with blk carrier would look great. Otherwise you will be a MOBY twin. :D not that looking like moby is a bad thing, He is bad ass. :rock:
 
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