Crashtd420 Posted May 23, 2017 Report Share Posted May 23, 2017 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.... 1 Quote Link to comment
Stoffregen Motorsports Posted May 23, 2017 Report Share Posted May 23, 2017 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. 1 Quote Link to comment
Stoffregen Motorsports Posted May 23, 2017 Report Share Posted May 23, 2017 Actually, there are a few other things that can cause that failure, but the ones I mentioned are the most common. Improperly phased joints, or bottoming out of the shaft inside the tailhousing, or axle wrap (wheel hop) can also cause that failure. 1 Quote Link to comment
hobospyder Posted May 23, 2017 Report Share Posted May 23, 2017 Picture bad. I'm guessing you mean the metal brackets above and below, are they the same as the 620 parts? 1 Quote Link to comment
skyblue Posted May 23, 2017 Author Report Share Posted May 23, 2017 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. 1 Quote Link to comment
Crashtd420 Posted May 23, 2017 Report Share Posted May 23, 2017 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.... 2 Quote Link to comment
Crashtd420 Posted May 23, 2017 Report Share Posted May 23, 2017 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 1 Quote Link to comment
skyblue Posted May 23, 2017 Author Report Share Posted May 23, 2017 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 2 Quote Link to comment
skyblue Posted May 23, 2017 Author Report Share Posted May 23, 2017 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 anothetThanks man! 1 Quote Link to comment
d.p Posted May 23, 2017 Report Share Posted May 23, 2017 So you think it was the shim that did you in? 1 Quote Link to comment
HOGIE Posted May 23, 2017 Report Share Posted May 23, 2017 I have that part skyblue 1 Quote Link to comment
Crashtd420 Posted May 23, 2017 Report Share Posted May 23, 2017 Same here.... found mine.... It's been sand blasted clean and painted with por15 . .. I don't know where anyone lives but I am up in Massachusetts.. if hogie is closer and gets you on the road quicker by all means go with him.... 2 Quote Link to comment
wayno Posted May 23, 2017 Report Share Posted May 23, 2017 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? 1 Quote Link to comment
Charlie69 Posted May 24, 2017 Report Share Posted May 24, 2017 I ran a Z20 5 speed in my 70 521 with a 520 drive shaft for over 250,000 miles with no problems. Eveven hauled over 1 ton sand loads with it more than once. Ran it down the freeway at 85 to 90 miles an hour all the time traveling back and forth fro Bagdad AZ to Phoenix AZ. 3 Quote Link to comment
mrbigtanker Posted May 24, 2017 Report Share Posted May 24, 2017 I ran a Z20 5 speed in my 70 521 with a 520 drive shaft for over 250,000 miles with no problems. Eveven hauled over 1 ton sand loads with it more than once. Ran it down the freeway at 85 to 90 miles an hour all the time traveling back and forth fro Bagdad AZ to Phoenix AZ. I agree its a fluke thing. Or pounding gears and got some axle wrap. I am 1 piece aluminum of course custom made with a 280 Z and FJ and no problems all the way up to almost 120 MPH. If it saves you money Mike put the old one in plus it is better for lowered trucks anyway. I just like the fact of no carrier bearing, just one more thing to give problems. 2 Quote Link to comment
Charlie69 Posted May 24, 2017 Report Share Posted May 24, 2017 This might help some of the rats! https://www.drivelinesnw.com/part-trouble-shooting/vibration-analysis/ https://www.drivelinesnw.com/part-trouble-shooting/vibration-analysis/angle-analysis/measuring-and-correcting-angle-problems/ https://www.drivelinesnw.com/part-trouble-shooting/vibration-analysis/phasing/ https://www.drivelinesnw.com/part-trouble-shooting/vibration-analysis/balance/ https://www.drivelinesnw.com/part-trouble-shooting/vibration-analysis/critical-speed/ 1 Quote Link to comment
skyblue Posted May 24, 2017 Author Report Share Posted May 24, 2017 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. 1 Quote Link to comment
skyblue Posted May 24, 2017 Author Report Share Posted May 24, 2017 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. 2 Quote Link to comment
skyblue Posted May 24, 2017 Author Report Share Posted May 24, 2017 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. 1 Quote Link to comment
Stoffregen Motorsports Posted May 24, 2017 Report Share Posted May 24, 2017 A custom one piece shaft should cost between $100 and $200. If you bring them the yokes and flanges (or a donor shaft with good joints) you can bet on it being about $100. It's just a re-tube job at that point. 3 Quote Link to comment
HOGIE Posted May 24, 2017 Report Share Posted May 24, 2017 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. Ill be at Canby, and I can send the part down with someone to the Datslocos show. That way you can get your truck fixed in time to bring it to Canby :poke: 1 Quote Link to comment
wayno Posted May 25, 2017 Report Share Posted May 25, 2017 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. 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. 1 Quote Link to comment
skyblue Posted May 25, 2017 Author Report Share Posted May 25, 2017 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! 1 Quote Link to comment
skyblue Posted May 25, 2017 Author Report Share Posted May 25, 2017 A few more pics of. Diff side One side of shaft. I don't really know what end this is but it got fucked. 1 Quote Link to comment
HOGIE Posted May 25, 2017 Report Share Posted May 25, 2017 That must've been a seriously noisy failure. The type that will make you have to change your undies? 1 Quote Link to comment
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