gmc drive shaft

gmcboy · 10-28-2009, 07:33 PM

i got a 2001 2500hd with a 6in lift kit in it i just replaced the u joints and now when i get between 35 and 50 it vibrates and there is tranny fluid leaking out but i have no idea why

BernieB · 10-28-2009, 07:45 PM

Fluid is leaking because the shaft is unbalanced and the vibration has probably destroyed the rear seal on the tranny.

gmcboy · 10-28-2009, 07:49 PM

the shaft has the weights on it still and it was only about an hour after hat it was leaking could it go that quick

BernieB · 10-28-2009, 08:00 PM

Of course the shaft still has the weights. They're spot welded on. But changing the U-joints can change the balance, especially if you got the yoke 180 degrees out of synch. And yeah, an hour is more than enough time to destroy a seal. I've seem 'em go in just a few seconds.

gmcboy · 10-28-2009, 08:03 PM

ok you know where i can take the shft to get it balanced and a new seal

BernieB · 10-28-2009, 08:11 PM

The seal you should be able to get at any auto parts place. On the shaft, try popping out the front joint and rotating the yoke 180 degrees then putting it back together.

Most mechanics will put a chalk or crayon mark on the joint before taking it apart, so that it goes back together again the same way and stays balanced.

gmcboy · 10-28-2009, 08:44 PM

ya i tryed the chalk just for got to do the font to thanks for the help do you know anything about fuel pumps it this truck

BernieB · 10-28-2009, 10:20 PM

Quote:

Originally Posted by gmcboy

ya i tryed the chalk just for got to do the font to thanks for the help do you know anything about fuel pumps it this truck

What do you want to know about them? I'm no expert on that model or year, having gotten out of the auto business in the mid 90's, but if I can answer the question I will. And there's guys on here with a lot more experience than I have with those who will also give answers and advice.

gmctrucks · 10-29-2009, 09:38 AM

Maybe the rearend is not at the right angle for some reason the u-joints went out then the seal went out so fast something is not aligned right or like Bernie said maybe the drive shaft is off balance.

iliketatertotz · 11-21-2009, 05:22 AM

Quote:

Originally Posted by gmcboy

i got a 2001 2500hd with a 6in lift kit in it i just replaced the u joints and now when i get between 35 and 50 it vibrates and there is tranny fluid leaking out but i have no idea why

And you thought the lift kit thing would be such a simple thing....DOH!

10-28-2009, 07:33 PM	#1
gmcboy Junior Member Join Date: Oct 2009 Posts: 4	gmc drive shaft i got a 2001 2500hd with a 6in lift kit in it i just replaced the u joints and now when i get between 35 and 50 it vibrates and there is tranny fluid leaking out but i have no idea why

10-28-2009, 07:45 PM	#2
BernieB Senior Member Join Date: Jul 2009 Location: Fredericksburg, VA Posts: 3,876	Fluid is leaking because the shaft is unbalanced and the vibration has probably destroyed the rear seal on the tranny. __________________ If the guys who design 'em had to take one home, use it every day for 2 years, and do all the maint and repairs themselves, cars would have a button on the dash to change the oil, filters & plugs.

10-28-2009, 08:00 PM	#4
BernieB Senior Member Join Date: Jul 2009 Location: Fredericksburg, VA Posts: 3,876	Of course the shaft still has the weights. They're spot welded on. But changing the U-joints can change the balance, especially if you got the yoke 180 degrees out of synch. And yeah, an hour is more than enough time to destroy a seal. I've seem 'em go in just a few seconds. __________________ If the guys who design 'em had to take one home, use it every day for 2 years, and do all the maint and repairs themselves, cars would have a button on the dash to change the oil, filters & plugs.

10-28-2009, 08:11 PM	#6
BernieB Senior Member Join Date: Jul 2009 Location: Fredericksburg, VA Posts: 3,876	The seal you should be able to get at any auto parts place. On the shaft, try popping out the front joint and rotating the yoke 180 degrees then putting it back together. Most mechanics will put a chalk or crayon mark on the joint before taking it apart, so that it goes back together again the same way and stays balanced. __________________ If the guys who design 'em had to take one home, use it every day for 2 years, and do all the maint and repairs themselves, cars would have a button on the dash to change the oil, filters & plugs.

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10-28-2009, 07:49 PM	#3
gmcboy Junior Member Join Date: Oct 2009 Posts: 4	the shaft has the weights on it still and it was only about an hour after hat it was leaking could it go that quick

10-28-2009, 08:03 PM	#5
gmcboy Junior Member Join Date: Oct 2009 Posts: 4	ok you know where i can take the shft to get it balanced and a new seal

10-28-2009, 08:44 PM	#7
gmcboy Junior Member Join Date: Oct 2009 Posts: 4	ya i tryed the chalk just for got to do the font to thanks for the help do you know anything about fuel pumps it this truck

10-29-2009, 09:38 AM	#9
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,645	Maybe the rearend is not at the right angle for some reason the u-joints went out then the seal went out so fast something is not aligned right or like Bernie said maybe the drive shaft is off balance.

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