Outer Limits 4x4 Board

Pulled t-case apart this arvo, to find out why it locked up and sent me spinning into the freeway guard rail, mangling the rear diff in the process..
Everything appeared in quite good nick.
Except for the large (LOW ?) cog was siezed solid to the shaft.
From what I can work out, which ever cog is selected by the selector, the other should spin free.
The smaller cog was free spinning, so LOW box was working.
But in high, the low cog was stuck solid, and also the selector wouldn't go over the synchro.
At least it doesn't look like there was anything I could have done to prevent it.
Other than stop driving if my passenger hears cicadas again.

This is all theory, cos I do not know much about the inner workings of t-case ...but does this sound correct?

christover

eww that didnt sound good. at least u ok after spinning the zook, not with the excess of power thou

yeh sounds about right thou about the gears u mentioned.

If the Low gear was siezed to the shaft, when you put it into High, the transfer would be trying to engage high and low at the same time. Because they are different ratios you get some evil binding, that would either lock it up or break something.

My guess is your needle roller bearing in the low gear died, and hence siezed. You may have been able to pick up on it if you had a keen ear, and it died over time, but if something failed quickly, yeah not much you can do about it. Was your oil all good?

Hope your alright.

Highway-Star wrote:If the Low gear was siezed to the shaft, when you put it into High, the transfer would be trying to engage high and low at the same time. Because they are different ratios you get some evil binding, that would either lock it up or break something.

My guess is your needle roller bearing in the low gear died, and hence siezed. You may have been able to pick up on it if you had a keen ear, and it died over time, but if something failed quickly, yeah not much you can do about it. Was your oil all good?

Hope your alright.

I don't have great hearing, but can usually "feel" noises.
My gf heard cicadas earlier, I'm guessing that was a warning.
But I had no warning just before it locked up.

Bearing appears to be a white metal type, but can't get it off to look..so it could be a needle roller.

I changed the oil the week before, old oil wasn't great.

My lady and I were ok, just scared carp out of us.
180 spin at 110 on fwy was exciting with the trailer on
My new trailer sufferred a bit, and car inverted a shackle, but all fixed up now

DAAAAAMN that would be scary as phuck, awsome you didn't roll it though mad skillz lol. Yeah I'd say the bearing gave way, which should have shown at least minor tell tale signs of wear rather than just BANG and dying.

GRPABT1 wrote:DAAAAAMN that would be scary as phuck, awsome you didn't roll it though mad skillz lol. Yeah I'd say the bearing gave way, which should have shown at least minor tell tale signs of wear rather than just BANG and dying.

everything else looked very clean and new, I'm wondering if it was reco'd in the past, and maybe bearing was not fitted right? wjho knows.

I'm hoping it was skill, but am leaning towards lucky, that we didn't roll.

christover1 wrote:My lady and I were ok, just scared carp out of us.

You had carp IN you?! lol thats gross.

good to hear you're ok dude - shame you didnt get it on video, would have made one of those awesome youtube vids. lol