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Member Since 05 Feb 2011
Offline Last Active Today, 03:17 PM

#1491444 Valentine

Posted by skyblue on 25 May 2017 - 04:15 PM

That must've been a seriously noisy failure. The type that will make you have to change your undies?

haha, yea. the truck shuffled a bit for a second. 


Appears to be the pavement side

 haha, thanks. i just wish i knew what the cause was.

#1491401 Valentine

Posted by skyblue on 25 May 2017 - 11:53 AM

A few more pics of.

Diff side

One side of shaft. I don't really know what end this is but it got fucked.

#1491398 Valentine

Posted by skyblue on 25 May 2017 - 11:38 AM

Maybe you should re-look into the shims you put in, maybe your angles were good without them if you went as long as you said without an issue.

Yea that's what I was thinking. I'm getting the 510 prepped so I'll have to put off the 521 till after canby.

Thanks for all your help everyone!

#1491146 Valentine

Posted by skyblue on 24 May 2017 - 07:58 AM

I will put another one piece back if I can find another 520 one. . Custom might be more than I want to spend. For now I have the 2 piece back in minus the lower carrier bearing bracket just to be able to move then truck around. I'll deal with it after canby.

#1491145 Valentine

Posted by skyblue on 24 May 2017 - 07:55 AM

Were you just driving a steady speed, did you slam on the brakes, did you just shift gears?
Did you remove leafs to lower the rear of your truck?

Yea I was driving about 75 steady. No braking. No shifting. Something just broke. I didn't remove any leafs. I used 720 4x4 leafs with 3 inch blocks and 2 degree pinion angle shims.

#1491143 Valentine

Posted by skyblue on 24 May 2017 - 07:53 AM

I have that part skyblue

Awesome! Thanks guys. I've decided no to take the truck to canby. If I don't find the part at the datslocos I'll grab it from you HOGIE when I go up to canby. Assuming you're going? If not I can swing by you on my way up if that's cool.

#1490879 Valentine

Posted by skyblue on 23 May 2017 - 08:25 AM

Stroffgren he still has his 2 piece driveshaft....
Hobo I think they are different... at least the rubber part of the carrier bearing are.. the 620 carrier is round while the 521 has a wierd shape.... little wings or something on the bottom.... anti rotation or something... no idea....

Yes I think you're right.


And sky I'm off work in a few hours... I head right home to work on my 521 so while the compressor is builds pressure I'll take a look.... I'll message you one way or anothet

Thanks man!

#1490878 Valentine

Posted by skyblue on 23 May 2017 - 08:24 AM

Was it originally a two piece shaft? And it was converted to one piece shaft? The part you show in the pic above is for the center support bearing, on a two piece shaft.
One piece shaft is fine, as long as it's not hitting anything, like the body, or frame. The angles of the tailshaft vs the pinion shaft need to be within about 3 degrees of each other for a healthy long joint life, but that won't affect the shaft. Unless of course the joint gets so bad that it causes the shaft to contact something, or if the joint fails completely.
One other thing that can cause a shaft to break in the middle (and I see this all to often) is if it has been built from two separate shafts and is welded together inside the span of the tubing. It should not be two pieces welded together, but one continuous piece of tubing. Was this shaft put together from two shafts?
A good driveline shop can advise you on what is too long. Most shops won't build one that's too long, as it becomes a liability for them.

It was a one piece from a 520 I grabbed at a pick n pull. I had it balanced before I put it on about 4 years ago. . I kept the 2 piece shaft that comes on 521's. But, going through my storage I can't seem to find the bottom piece.

I had just installed 2 degree pinion angle shims to correct the angles not even 500 miles ago.

This one piece was not made from 2 shafts. 520's came from the factory with a one piece.

Thx for the help

#1490874 Valentine

Posted by skyblue on 23 May 2017 - 08:18 AM

I might have what you need....
Do you need both pieces or just that bottom?... I am using the top, almost as a catch incase something went wrong but I am not using that bottom piece.
I used a carrier bearing from a volvo on mine... had a nice bracket built in to bolt it down...
I need to locate in my garage but I am sure I have it....

Thanks!I have the top piece. And I know I have the bottom I just can't find it. Keep me posted if you find it.

#1490862 Valentine

Posted by skyblue on 23 May 2017 - 07:23 AM

This is the part I can't find. Anyone have one for sale?


#1490860 Valentine

Posted by skyblue on 23 May 2017 - 07:16 AM

Dang all bad

Yea dude. Was hoping to drive it to datslocos this weekend. Don't think that's happening.


Just make a new 1 piece. I would not go back to 2 piece.

I dunno. I'm discouraged.

#1490859 Valentine

Posted by skyblue on 23 May 2017 - 07:12 AM

Could be a lot of different things that caused it to start to wobble, hitting a pot hole or some debris on the hiway, maybe even the drive line having a different angle at the transmission yoke compared to the angle at the pinion flange, it could even have been a defect in the drive line itself.
You can have one made with the math being done first for drive line dimensions(size verses length), it likely will be larger round, or just go back to the 2 piece.
I have another 520 drive line here, but that will not get you to Canby.
How long did that one last?
It could have been a lot worse also.
How is the transmission?

I put in the 2 degree pinion angle shims and I'm wondering if that had an effect on it too?!

Luckily I still have my 2 piece driveshaft so I pieced it back together and put it on so at least it's mobile. Though, I couldn't find the piece that the carrier bearing sits. Does any one have a extra?

Not sure if I feel comfortable taking the truck to canby now. The exhaust has a huge hole now and it's so loud. I'm pretty bummed cause I've done a ton of work on the old girl and really wanted to take her up. Undecided.

I can't remember exactly how long the 1 piece was on. I want to say 4 years. I did drive the truck to my dads, about 14 miles. Transmission feels ok.

#1490782 Valentine

Posted by skyblue on 22 May 2017 - 08:44 PM

yea. i was going about 75 when it happened. I guess 520 shafts weren't engineered to go that fast? lol

#1490776 Valentine

Posted by skyblue on 22 May 2017 - 08:28 PM

so i broke her today. :(





driveshaft just broke in half.





the damage.







#1490433 521 brakes gave up overnight

Posted by skyblue on 21 May 2017 - 02:33 PM

I went with beebani's disk kit, I love klotz items as well.
either way, the MC swap to a duel reservoir is much worth it. even if you don't swap to front disk's.
so next time the master goes out, you still have at least half your brakes!

Yea. That ^^