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Old January 24th, 2012, 09:44 PM   #1
tonkatruckon44s
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Default u joint problems

i have a 1989 k5 blazer with a sm465np205 combo in it but both joints on the rear driveshaft keep going out on me and this isnt wheeling its just daily driving its been about 6 in the last month idk what is wrong only 1 has been the one at the axle the transfercase one has broke 5 times is there something i am doing wrong. btw the blazer has 8 inches of suspension lift but the driveshaft angles arent that bad at all so i dont understand.
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Old January 24th, 2012, 10:10 PM   #2
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Is it held on by a strap or ubolt? If u bolt you could be over tightening it causing it to bind. Also if you blew a few ujoints your yoke is probably messed up. I fought the same thing as you and finally took a u joint and put it on the yoke, tightened it down and it bound up because the yoke was mared up and damaged. new yoke no more problems
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Old January 24th, 2012, 10:29 PM   #3
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Pic of driveshaft?
Is your shaft 'in phase'?

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Old January 24th, 2012, 10:53 PM   #4
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Correct your pinion angle to compensate for the lift.

How is your front driveshaft surviving with 8 inches of lift?
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Old January 24th, 2012, 10:54 PM   #5
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Quote:
Originally Posted by kb8ymf View Post
Pic of driveshaft?
Is your shaft 'in phase'?

j-kb8ymf
I wouldn't think it would be a two piece driveshaft considering its a 4x4.
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Old January 24th, 2012, 11:12 PM   #6
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Quote:
Originally Posted by Nuggets View Post
I wouldn't think it would be a two piece driveshaft considering its a 4x4.
That's why I asked for a pic. There are plenty of two piece shafts on 4X4's
I wasn't assuming anything just yet but both yokes need to be in phase if the d'shaft has a slip joint in the shaft or it's a slip joint in the t'case.
If he's going through u-joints almost weekly there is something drastically wrong. It might be bent also.
There's always more to the story..................
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Old January 24th, 2012, 11:14 PM   #7
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cardan joint rear shaft and make sure your pinion angle is good. also, what spline count on the 205 are we working with here to suggest where to rob parts
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Old January 25th, 2012, 10:50 PM   #8
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idk if you would call it a one piece or two piece shaft because the slip yoke is on the shaft like it is on a front shaft because a 205 is a non slip yoke and i believe it is either a 28 or 31 spline not qite sure but i gotta find a new yoke now because my buddy said it was a "ujoint broke" but he snaped a ear off the yoke
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Old January 26th, 2012, 10:25 AM   #9
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go find an np208 with the flange and cardan joint front shaft. you'll have to source the flange seal but that's only 6-9$. find a long piece of tube with the same ID, remake shaft, done.

add some trans fluid to the shaft, keep the slip at about 1-1.5" each way. weld one end at a time providing time for it to cool so you don't create a pressure vessel with the oil.

tuh dah, a 40-80$ driveshaft that solves all your problems.
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Old January 26th, 2012, 10:31 AM   #10
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i found a new yoke for 45 buck and then when i get a chance i am going to take it to the driveshaft shop and have them make me a new one
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