datson4life Posted September 3, 2014 Report Share Posted September 3, 2014 So new u joints and they are going bad in less than 100 miles into them, set-up is completely stock 521 4 spd, stock rear end and carrier bearing Carrier bearing and boot is fine, but are ujoints going Bad because truck is lowered? My buddy has a slammed 521 and he has ujoint problems ooften, either way i plan on going one piece driveline soon, but my question is, does lowering a 521 kill ujoints? Green one mine, black one his 1 Quote Link to comment
heretic Posted September 3, 2014 Report Share Posted September 3, 2014 if your pinion angle is set properly you should have no issues. 5 Quote Link to comment
bilzbobaggins Posted September 3, 2014 Report Share Posted September 3, 2014 too much booty B) 1 Quote Link to comment
tr8er Posted September 3, 2014 Report Share Posted September 3, 2014 likely due to lowering. Stock ride height is optimal for drive-line Quote Link to comment
datson4life Posted September 4, 2014 Author Report Share Posted September 4, 2014 if your pinion angle is set properly you should have no issues. Ill double check but im sure we did it right 1 Quote Link to comment
Pacific coast Datsun Posted September 4, 2014 Report Share Posted September 4, 2014 You can install angled blocks or shims the go under non.angled blocks. Another fix is to raise the carrier bearing up about an.inch...it helps correct the driveline angle. 2 Quote Link to comment
datzenmike Posted September 4, 2014 Report Share Posted September 4, 2014 likely due to lowering. Stock ride height is optimal for drive-line Actually drive line is optimal for stock ride height. Drive line can be modified to be optimal for any ride height. Changing ride height without addressing the drive line angles is going to cause problems. You can install angled blocks or shims the go under non.angled blocks. Another fix is to raise the carrier bearing up about an.inch...it helps correct the driveline angle. A one inch raise on the carrier will help correct but only for a certain amount of drop. All body drops are different. Drive line angles must be measured and the angles adjusted to cancel out the vibrations. Take a look at this. The input end on the left is turning at a steady speed. Look at the output on the right. It actually has to speed up and slow down to transmit turning around a bend. The best way is to have two U joints opposite each other. When one is accelerating the other is slowing down... they cancel. This only works if both angles are also identical. A larger bend means a faster acceleration on one end and it vibrates. Both angles must be the same. 4 Quote Link to comment
datson4life Posted September 4, 2014 Author Report Share Posted September 4, 2014 Im pretty sure its angled right, ill double check tomorrow im still planning on going one piece Thanks for info fellas Quote Link to comment
metalmonkey47 Posted September 18, 2014 Report Share Posted September 18, 2014 If you use a one piece driveshaft, you should be okay. My pinion angle was dead on with a one piece in my 620, about 5-ish inches lower then stock. Quote Link to comment
ruckycharms Posted January 6, 2015 Report Share Posted January 6, 2015 What ended up happening here Carlos? Obviously I am curious about the outcome.. lol 2 Quote Link to comment
mrbigtanker Posted January 7, 2015 Report Share Posted January 7, 2015 What ended up happening here Carlos? Obviously I am curious about the outcome.. lol Bro this is like so last year. 1 Quote Link to comment
datson4life Posted January 7, 2015 Author Report Share Posted January 7, 2015 What ended up happening here Carlos? Obviously I am curious about the outcome.. lol The u joints were caca, replaced and now everything good, 10 hp increase Quote Link to comment
datson4life Posted January 7, 2015 Author Report Share Posted January 7, 2015 What ended up happening here Carlos? Obviously I am curious about the outcome.. lol Ohh wrong thread, its starting to ping a little again because AutoZone u-joints are known to do that after a month 1 Quote Link to comment
datson4life Posted January 7, 2015 Author Report Share Posted January 7, 2015 Wrong truck in mind Quote Link to comment
banzai510(hainz) Posted January 7, 2015 Report Share Posted January 7, 2015 I hve 3inch Belltech blocks 2deg slope. 6202 part# been good for years. More than 3 inch I would start worrying Quote Link to comment
JoeCool Posted January 8, 2015 Report Share Posted January 8, 2015 I hve 3inch Belltech blocks 2deg slope. 6202 part# been good for years. More than 3 inch I would start worrying Back in the day (late 90's to early 2000's) I rode on some 4" sloped blocks from AIM for five years with no issues. Quote Link to comment
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