Front driveshaft questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

krue · 03-10-2006, 08:09 PM

I have a 72 blazer 4wd w/350/350np205. The front driveshaft looks like the pic. My questions are how do I get the u-joint ass'y apart, what's the rig in the center called and where can I buy one?
Oh yeah are the splines on the other end supposed to be tapered?

BTW credits to JYJ for the pic.

GMCMAX · 03-10-2006, 09:01 PM

If your'e talking taking the double cardan joint apart, it will take patience and lots of cuss, but there not as bad as you will think. As long as the stub on the driveline is good, no problem, if the small yoke (the one with the bolts in it) with the ball inside is bad, it should be available at napa.
Pull the outer u-joint apart first from the cage, then pull the small inner yoke out, it has a small spring under it pushing it outward, the joint should fall out of the yoke.
Remove the rear joint from the cage first, be careful of the stub on the shaft end, remove the joint from the driveline last.
Assembly is the reverse.
The biggest pain is that spring pushing out, and getting the yoke ball back on the stub without knocking a needle down. Good luck

03-10-2006, 08:09 PM	#1
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Front driveshaft questions I have a 72 blazer 4wd w/350/350np205. The front driveshaft looks like the pic. My questions are how do I get the u-joint ass'y apart, what's the rig in the center called and where can I buy one? Oh yeah are the splines on the other end supposed to be tapered? BTW credits to JYJ for the pic. Attached Images __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

03-10-2006, 09:01 PM	#2
GMCMAX Active Member Join Date: Jan 2006 Location: Lower Mid-East Ca. Posts: 326	Re: Front driveshaft questions If your'e talking taking the double cardan joint apart, it will take patience and lots of cuss, but there not as bad as you will think. As long as the stub on the driveline is good, no problem, if the small yoke (the one with the bolts in it) with the ball inside is bad, it should be available at napa. Pull the outer u-joint apart first from the cage, then pull the small inner yoke out, it has a small spring under it pushing it outward, the joint should fall out of the yoke. Remove the rear joint from the cage first, be careful of the stub on the shaft end, remove the joint from the driveline last. Assembly is the reverse. The biggest pain is that spring pushing out, and getting the yoke ball back on the stub without knocking a needle down. Good luck __________________ Never try to teach a pig to sing; it wastes your time and annoys the pig! Gets More Chicks My lugnuts require more torque than your honda makes! 68 GMC, 4X4 conversion w/73 k20 running gear and springs, 350 4spd, 4.10's, D44 powerlok front, 14BFF govlock rear, 33" tires, lifted 4".



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