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99 Tahoe

mswozniak

By mswozniak
in Ask A GM Technician

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mswozniak Enthusiast

mswozniak

Posted
Posted

99 Tahoe 4x4 has a driveline slap on acceleration from a stop. I'd swear it's in the rear differential. 127,000 miles. I've heard there's a known problem with these rear ends. Any ideas on what it might be? I also get a roar at 65-70. I've been told that could be the bows on the roof rack.

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

Pretty common occurance. Take the driveshaft out and lube the splines on the yoke. We have a special lube for this purpose, but I suppose you could use any good quality grease and see if that eliminates the noise. It may not last if the grease is not the right stuff, but it should work initially at least.

 

The noise/feel this causes can be pretty severe. Sometimes it almost feels like someone bumped you in the rear.

 

I am not aware of any known problems with the rear end. Sure, they can and do fail, but there's nothing common that affects a large percentage of them.

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted
I did try chasis lube twice and that did seem to work for a short period both times.  What is the special lube?

 

It's kinda funny because it's actual name is "Special Lubricant". :D At least that's what it says on the can. I'd have to get the part number off the can when I get back to work because it has changed several time since the original TSB came out. It's a pint size can and might be a bit expensive as it will do many, many driveshafts.

mswozniak Enthusiast

mswozniak

Posted
  • Author
Posted
I did try chasis lube twice and that did seem to work for a short period both times.  What is the special lube?

 

It's kinda funny because it's actual name is "Special Lubricant". :crackup: At least that's what it says on the can. I'd have to get the part number off the can when I get back to work because it has changed several time since the original TSB came out. It's a pint size can and might be a bit expensive as it will do many, many driveshafts.

 

 

 

 

mswozniak Enthusiast

mswozniak

Posted
  • Author
Posted

AND THE ANSWER IS....3 days. It was fine for a total of three days after I applied the special lubricant but now its back to the same old clunk.

Anyone have the TSB number or part number for the nickel plated yoke?

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

12477702

Yoke Asm., Prop Shf Slip (with u-joint) , Nickel Plated

4WD/AWD 1500 Series Ext Cab Short Box Pickups (New Style and Old Style)

 

12477704

Yoke Asm., Prop Shf Slip (with u-joint) , Nickel Plated

4WD/AWD 2500 Series Ext Cab Short Box Pickups (New Style)

 

12479383

Yoke Asm., Prop Shf Slip (without u-joint) , Nickel Plated

 

Must Be Ordered With U-Joint Kit P/N 12479126

4WD/AWD 1500 Series Silverado, Sierra Regular Cab Pickups (New Style)

 

4WD/AWD 1500 Series Suburban, Avalanche, Yukon XL, Escalade EXT, Escalade ESV with AWD (New Style)

 

K1500 Series Regular Cab Pickup, Tahoe, Suburban, Escalade (Old Style)

 

12479384

Yoke Asm., Prop Shf Slip, (without u-joint) , Nickel Plated

 

Must Be Ordered With U-Joint Kit P/N 12479126

4WD/AWD 1500 Series Tahoe, Yukon, Escalade w/ 4WD or AWD (New Style)

 

12479385

Yoke Asm., Prop Shf Slip (without u-joint) , Nickel Plated

 

Must Be Ordered With U-Joint Kit P/N 12471510

4WD/AWD 2500HD/3500 Series Silverado and Sierra Regular Cab, Long Bed Pickups with 6.0L (RPO LQ4) Engine (New Style)

 

89058876

Yoke Asm., Prop Shf Slip (with u-joint) , Nickel Plated

4WD/AWD 2500HD Series Silverado and Sierra Crew Cab, Short Bed Pickups with 5-Speed Allison Transmission (RPO M74) (New Style)

 

4WD 2500HD/3500 Series Silverado and Sierra Extended Cab Long Bed Pickups with 5-Speed Allison Transmission (RPO M74) (New Style)

 

4WD 2500HD/3500 Series Silverado and Sierra Regular Cab, Long Bed Pickups with 5-Speed Allison Transmission (RPO M74 build date before 2/2004) (New Style)

 

4WD/AWD 2500HD Series Silverado and Sierra Extended Cab, Short Bed Pickups with 5-Speed Allison Transmission (RPO M74 build date before 2/2004) (New Style)

 

89058878

Yoke Asm., Prop Shf Slip (with u-joint) , Nickel Plated

4WD/AWD 2500HD/3500 Series Silverado and Sierra Extended Cab Pickups with 6.0L (RPO LQ4) Engine (New Style)

 

4WD 2500HD Series Silverado and Sierra Crew Cab, Short Bed Pickups with 6.0L (RPO LQ4) Engine (New Style)

 

89058880

Yoke Asm., Prop Shf Slip (with u-joint) , Nickel Plated

4WD/AWD 2500HD/3500 Series Silverado and Sierra Regular Cab, Long Bed Pickups with 5-Speed Allison Transmission (RPO M74 build date after 2/2004) or 6-Speed Manual Transmission (RPO ML6) (New Style)

 

4WD 2500HD Series Silverado and Sierra Extended Cab, Short Bed Pickups with 5-Speed Allison Transmission (RPO M74 build date after 2/2004) or 6-Speed Manual Transmission (RPO ML6) (New Style)

 

12479126

U Joint Kit

4WD/AWD 1500 Series Silverado, Sierra Regular Cab Pickups (New Style)

 

4WD 1500 Series Suburban, Avalanche, Yukon XL) (Escalade EXT, Escalade ESV with AWD (New Style)

 

4WD 1500 Regular Cab Pickup, Tahoe, Suburban, Escalade (Old Style)

 

Tahoe, Yukon, Escalade w/ 4WD or AWD (New Style)

 

12471510

U Joint Kit

4WD/AWD 2500HD/3500 Series Silverado and Sierra Regular Cab, Long Bed Pickups with 6.0L (RPO LQ4) Engine (New Style)

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