Help! Busted Front End Don't Know What It Is

Wrench

One Bashed Up 80
 
 
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Hi I was wheeling over the weekend and I busted something in my front end. I was throttling up a snow covered hill when I hit a bump and jumped the front end up and when it came own something broke. I thought I broke a birfield but today I pulled both sides out and they both look fine. No metal bits or anything in the grease. How notacible is a broken birfield? I'm at a loss right now don't know where to look next. Someone on the trail said I broke my ring and pinion. At the time I don't think so. Wouldn't the birf go first? Should I check the ring and pinion? Any ideas?
 

motorsargeT

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Most of the broken birfs I have seen were quite obvious. Also if the front shafts are out you're only like 12 bolts away from pulling the diff anyway. might be worth a look.
 

Beowulf

 
 
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Somewhere in the foothills...
Drain the front diff and see what comes out. A busted ring gear should leave some big chunks on the magnetic drain plug. A broken birf is very noticeable... lots of clanking and loud metallic noises, plus driving it is dangerous because the steering could get jammed and you are very likely to do irreparable damage to the axle housing.

When you say you pulled both sides, you don't say how far you pulled them. Did you remove the hub so you can see inside the knuckle?

Does it still drive? Do you have to lock the center diff to get it moving? What noises does it make?

-B-
 
Last edited:

ppc

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You really need to describe what symptoms your currently experiencing.

Did you drive it back home?
Does it make noise going straight ahead or only on turns, right or left?
Does it rattle or grind?

Have you checked the shocks and springs? Driveshafts and U joints?
 

Wrench

One Bashed Up 80
 
 
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I had it flatbedded home. It still drives but makes a loud clunk and shakes the truck violently every so often. This is like driving under 5 mph. And on a steep hill it makes the sound of someone taking a metal hammer and hitting a piece of 1/4 inch steel at a rapid pace.
It will drive either way CDL engaged or not.
I pulled both birfs out and physically looked at them and they looked fine every ball was in it's place. rotated fine.
 

Vlad

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R&P sounds like. I have broken them on these trucks before...only twice :p
 
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Most of the broken birfs I have seen were quite obvious. Also if the front shafts are out you're only like 12 bolts away from pulling the diff anyway. might be worth a look.
2nd that, its only another 15 min of work and will narrow down your search
 

Vlad

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oooh, if you have a crawl box it could be bad news indeed...but you should be able to tell if it is coming from the R&P pretty quickly with a second set of ears near the front end while rolling forward.
 

landtank

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now that the birfs are out, drop the front drive shaft and turn the flange. If the Ring is broken I woul dhave to beleive you will feel it.
 

sleeoffroad

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Yup, that is how they break. Front end in the air under power, then suddenly comes down and grabs traction. BTDT a couple of times.
 

Nay

 
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4.88 or 5.29? Not that it probably mattered since the teeth shattered in that circumstance.
 

Wrench

One Bashed Up 80
 
 
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Yup, that is how they break. Front end in the air under power, then suddenly comes down and grabs traction. BTDT a couple of times.
Christo why didn't the birfields break first before the ring and pinion? I always thought the birfs were the weak link in the system.
 
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