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  #1  
Old 05-02-2013, 03:34 PM
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Question 4x4 "exercise" question

All my previous 4x4's (foreign as well as domestic) mentioned the need to engage the system at least monthly for a minimum amount of miles (Tundra stated minimum 10 miles monthly). I have yet to see any kind of notice in my manual on this (although I haven't gotten to the back cover either). Anybody know about this with Ram? What is the standard custom in this regard?
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Old 05-02-2013, 03:46 PM
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Not sure, but don't think it would serve any purpose. There aren't any locking hubs, it's a unit bearing, the front wheels spinning keeps gear lube getting slung around.

I wouldn't worry about it.

- DAA
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Old 05-02-2013, 04:55 PM
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Quote:
Originally Posted by DAA View Post
Not sure, but don't think it would serve any purpose. There aren't any locking hubs, it's a unit bearing, the front wheels spinning keeps gear lube getting slung around.
Ok, this seems to be a completely different system than I've seen then. In my Tundra, the solenoid engages the shaft from the transfer case to the front diff which in turn causes pawls to protrude from the hub under centrifugal force and engage the front wheels. So when the front diff is disengaged the pawls retract. I noticed that the engagement motor on the Ram also appears to be on the oppposite side of the transfer case than on the Tundra.

Are you saying that the front differential gears are always turning with the front wheels regardless of engagement?
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Old 05-02-2013, 05:14 PM
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Does the manual say anything about it
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Old 05-02-2013, 07:02 PM
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Trucks just parked in 2wd and I just got done crawling all over under the truck... and am perplexed. The shaft going from the transfer case to the front axle diff turns easily by hand. The shafts from the diff to the hubs are obviously locked to them (meaning to my thinking that they will turn with the wheels no matter what mode the 4x4 switch is in). So seems that previous poster is dead on accurate that there aren't any hub lockers since they are already in effect "locked". But I have more questions now:

1) does the front axle work like a conventional 2wd rear axle (just one wheel is actually powered) or is it like ALL the other 4x4's I've ever seen where they are "solid"?

2) There has to be some sort of internal clutch or one way bearing at the front diff, right? Otherwise somethings broke as the shaft would just be free spinning even with the transfer case engaged...

I guess I know what I'm doing tomorrow after work...jacking up the front end and spinning wheels to understand the mechanism...inquiring minds and all got to know...
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Old 05-03-2013, 12:51 AM
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I have never heard of this 4x4 exercise thing before, I am now curious. I know mine gets used enough so I don't need to worry about it right now but it would be good to know just incase. This just means I have to find more places to offroad
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Old 05-03-2013, 03:38 AM
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Quote:
Originally Posted by turbohawk View Post
1) does the front axle work like a conventional 2wd rear axle (just one wheel is actually powered) or is it like ALL the other 4x4's I've ever seen where they are "solid"?
Could it be both? I seem to recall the owners manual mentioning that riding around with the car set to 4WD Auto will return worse fuel economy than when it is set for 2WD.

Maybe the 2WD setting is exactly that and then when the truck is set to 4WD Auto it becomes locked up?
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Old 05-03-2013, 10:14 AM
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You should probably define your terms. I don't know what you mean by "solid". The rear is a solid axle, the front is independent. What do you mean when you say "locked up"? If you mean both wheels getting equal power, then no, it never "locks up", on either front or rear axles.

The front is an open differential, period. If one wheel loses traction it will get all the power sent to it because the diff thinks you are just making one helluva hard turn and it must be the outside wheel. The rear might be pure open, or have the optional anti spin which uses torque actuated clutch packs to modulate power and attempt to send power to both wheels, but even then, it isn't actually locked and it isn't uncommon under high torque to over power the clutch packs and have only one wheel getting power.

Simply put, unit bearings, no locking hubs, so front wheels turn ring gear which turns pinion which turns drive shaft even when 4WD not engaged (I don't think there is a vacuum or electronic disconnect on these axles?). No lockers on either end, front IFS, rear solid, front open always, rear open unless anti spin equipped but that is still more like being open than being locked.

Really don't know what your questions mean though, so the above may not even be addressing them. So I'll stop now <grin>.

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Old 05-03-2013, 10:48 AM
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if i had a 4wd I would make sure I engaged it and used it for 10 or so miles a month. could not hurt, but not using it may end up hurting. besides go have fun for 10 miles a month, you bought a 4wd use it.
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Old 05-03-2013, 10:49 AM
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Quote:
Originally Posted by plumcrazy73 View Post
if i had a 4wd I would make sure I engaged it and used it for 10 or so miles a month. could not hurt, but not using it may end up hurting. besides go have fun for 10 miles a month, you bought a 4wd use it.
I've tried a few times but my useless tires won't cooperate. I have to get better tires first.
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