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Old 01-17-2010, 04:43 PM   #1
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Long Travel 4x4's?

This is mainly concerning the kits other than the All Pro kits. The serious LT kits. With having the extended axles, doesnt it make the axles a lot weaker? Does it affect the 4wd capabilities?
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Old 01-17-2010, 05:02 PM   #2
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My question is, why do they need longer axles in the first place?
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Old 01-17-2010, 05:04 PM   #3
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Quote:
Originally Posted by Caduceus View Post
My question is, why do they need longer axles in the first place?
b/c the LT kits push the wheels and spindles further out from the truck, so u need longer axles to reach them
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Old 01-17-2010, 05:10 PM   #4
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Quote:
Originally Posted by Stillfly199 View Post
This is mainly concerning the kits other than the All Pro kits. The serious LT kits. With having the extended axles, doesnt it make the axles a lot weaker? Does it affect the 4wd capabilities?

the steel (or differnet metal...i can't remember what type they use) is a LOT stronger than the stock axle metal is so i cant see them being weaker
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Old 01-17-2010, 05:12 PM   #5
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^^i think most are chromoly or whatever....stronger than stock
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Old 01-17-2010, 05:30 PM   #6
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Ok, I can understand that. Thanks for the input
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Old 01-17-2010, 06:37 PM   #7
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Quote:
Originally Posted by jhodge83 View Post
b/c the LT kits push the wheels and spindles further out from the truck, so u need longer axles to reach them
While that makes sense, my un-stated question was: Why do you need the wider wheelbase in the first place?

Sorry I wasn't clear - mind-reading isn't a requirement.
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Old 01-17-2010, 06:51 PM   #8
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Long travel allows more wheel travel, and allows you to haul ass through the desert
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Old 01-17-2010, 07:36 PM   #9
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Quote:
Originally Posted by Caduceus View Post
While that makes sense, my un-stated question was: Why do you need the wider wheelbase in the first place?

Sorry I wasn't clear - mind-reading isn't a requirement.
It comes down to geometry. Put your arm out horizontally and move your finger up and down you can move it like 2 inches before things would bind. Now move your arm up and down at you're elbow. You would be able to move it like a foot before things would bind theoretically speaking if it were a control arm.

I hope this makes sense.
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Old 01-17-2010, 07:42 PM   #10
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^ great way to explain it!
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Old 01-18-2010, 02:57 AM   #11
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Quote:
Originally Posted by Jason'sLawnCare View Post
It comes down to geometry. Put your arm out horizontally and move your finger up and down you can move it like 2 inches before things would bind. Now move your arm up and down at you're elbow. You would be able to move it like a foot before things would bind theoretically speaking if it were a control arm.

I hope this makes sense.
Yeah, that makes sense.
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Old 01-19-2010, 08:50 AM   #12
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Somewhat related to this thread, I found a post from a guy who documented (with pics) how to replace a broken front axle on his FJ. He made some good comments about the CV joint being the weakest link in the axle.
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The most vulnerable part of the drive mechanics in an IFS 4x4 is the front CV axle. This has been true through several generations of IFS 4x4's. This part, specifically the CV joint, is the most common major mechanical failure that I know of when people push their IFS rigs, rock crawling on challenging trails...

Several popular upgrades contribute to putting this part at risk. The most common is large tires. Larger tires put a proportionally larger torsional load on the axle. Another is gearing modifications. Lower gears, increasing "crawl ratio", also increase the torque multiplication by the same amount. Finally, suspension modifications which facilitate the creation of situations where the CV joint is maximally articulated (to the extreme of it's capacity for misalignment) also facilitate putting this joint into it's weakest orientation, relative to torsional loading.

If you put on big tires and big gears, and you turn the steering wheel to full lock, and you gas it against an obstacle, you'll snap the CV joint.
--BellyDoc (Jon) from fjcruiserforums
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Old 01-19-2010, 08:53 AM   #13
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Old 01-19-2010, 09:27 AM   #14
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To bring that article into the topic, by increasing the length of the control arms and effectively using bump stops and limiting straps you keep the driveline angles well within their functional capacity with the same or more wheel travel.

Yes, you could run LT without limiting straps or bump stops for super travel but you'd also be increasing torsion at the fulcrum and the CV axle would have to do more work (force over distance) at the same driveline angles as stock. Then you'd be back to grenading CVs like it's going out of style. You'd be worse off with a long travel set-up allowed to run to the extremes of articulation.
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