Hey Ya'll

I have the "clunk" when accelerating. When I looked under the Expo at the driveshaft, I noticed where it goes into the transmission, I have a rubber boot (seal?) - no flange. Is this where the slip yoke is located? I noticed at my rear differential I have the 4 flang bolts - is this the location everyone is talking about?

Any help would be appreciated

Jeff

2000 Expedition 4X4 XLT
5.4L
K&N FIPK
Gibson cat back
Hellwig Rear Anti Sway Bar
Custom Program Superchip 5-program
Yukon 4.10 rear and Front Diff.
LT265/75/R16 Michelin 10 ply
B&M Trans Temp Gauge
Bilstein Shocks
Amsoil

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You are correct on both counts. be sure to index the driveshaft so it is installed the same way it is removed. Indexing involves drawing a line on the sahat and on the extention housing and on the flange. You line these marks up when you reinstall the shaft. The 4 bolts at the differential end require a 12mm 12 point socket.

Regards

Jean Marc Chartier

Edit: My brain said to type Shaft and my fingerd typed Sahat

 

Thanks Jean

Everything is clear now!

Jeff

 

I have a 97 F150 4x4 Lariat 4.6. 120k I've been going rounds with trying to fix the clunk you can hear and feel at take off from a dead stop. Tried to chave the differential fluid with new limited slip additives etc with no luck. Greasing the slip yoke is what I have questions about. I remove the 4 12point, 12mm bolts from the driveline ujoints. What then? Any special tools needed.

When I asked the parts guy he told me to replace the differential all together. I have read about greasing the spline on several forums, with all positive results, however he said the spline I was talking about, was lubed by the differential fluid. Wouldn't the differential fluid leak out if this was the case. Help please

Thanks in Advance, Oregon Boy

 

The slip yoke is at the transmission end of the drive shaft. You undid the bolts at the pinion flange of the differnetial. See pic item # 2 . You want to pull the driveshaft out of the transmission and grease inside of the slip yoke item #9. Not too much grease mind you.

JMC

 

JMC

Thanks, I will try that this weekend.

I guess I was confused. The clunk I feel, I thought was further back. But all the descriptions given on this thread are the same as I have. Is there anything to grease at the differential side? Hopefully this will work.

Thanks, Oregon Boy

 

Ford has had this clunking noise off and on in many vehicels since the early 70's. they even developed a special grease for this problem it's called slip yoke lube It looks like a light blue whiped cream you put a fair amount inside the yoke and re install this will usualy fix the problem for a while. If memery srves me right there may be a service bullitan on yore truck to replace the yoke and install a new antigrunt seal check with a deale have them do an 'oassis' for youre trouble code.

 

Is the clunk we all feel doing damage to the vehicle? This seems to be a familiar problem with many Ford Trucks. I don't want to get stranded while away from town. Does it get worse with time?

How to you tag an image in this post? I want to include a pic of my truck...

 

Hey I did it and it seemed to work. Diffinately got better. I still feel it slightly. How much lube should I have used? Some say a lot. I've heard put enough in that it acts as a spring as you try to reinstall the shaft. I just brushed it into the yolk and pretty much filled the ribs inside, after thoroughly cleaning. It was totally dry...

 

i did exactly the same thing last weeking and it helped eliminate the CLUNK to a degree. I still feel it sometimes, but not as bad.

I also need to know what he is asking. So a reply would be great.

Brett

 

I was just asking how much grease I should use. Someone from work said if by chance the grease mixes with the tranny fluid it could cause the tranny to slip and burn up. Is there any reason for concern while doing this.

 

Contamination of the transmission fluid is not an issue as long as you use the specialized teflon grease (Ford part # D2AZ-19590-A)

It comes in a 1# can for about $15-$20 depending on the dealer.

Cheers, Wm.

 

I had already used a teflon base grease I bought from Schucks. It said something like "Ford bearing, ujoint grease, ....." It specifically said Ford on the tube.

I didn't use that much and it worked for almost a month. The "Clunk" is back but not as bad as before. Any suggestions?

Is this grease type going to burn up my tranny?