Thud on take-off

[00f250]

I'm sure this has been posted before, but I don't remember where. Ok, so when I take off I get this clunk like feel. I remember people saying that it is the slip joint on the rear 2 piece drive shaft. Does it just need re-greased? Is there any special grease I need to use? Of course I need to mark the placement of all the joints so i get everything back in the same spot upon re-assembly. BTW the thud is pretty noticeable. Thanks in advance.

[Rodslinger]

Rice burner underneath you?

Sorry Dave I'm no help. One of the smart guys will have to help ya with that one.

[jeshoyt]

Are you noticing the thud or clunk sometimes when you come to a stop as well? If so, sounds like it's definitely a spline grease job. Common problem with super duty trucks. You'll need to drop the rear shaft of the 2 piece driveline. Yes, make sure you mark both the shaft and somewhere on the rear differential so you can line it up correctly when you re-install it. Ford sells a teflon spline grease for this application, but unless you want to spend $37 for a pint of grease, go to your local parts store and buy some slick 50 gl1 rated grease for $6. If you're careful you can reuse the rear clamp on the rubber boot. You only need to take the rear clamp apart and slide the rear shaft off. Grease the splines and put a dab into the female portion of the front piece. Put her all back together and enjoy thud free driving.

[00f250]

Originally Posted by Rodslinger

Rice burner underneath you?

Sorry Dave I'm no help. One of the smart guys will have to help ya with that one.

Never thought about the ricer burner being stuck underneath.

******* - yes I feel it when coming to a stop as well.

[jeshoyt]

Yep, spline grease job. It's about a 30 minute job or so.

[00f250]

Sounds like a fairly easy job. Thanks.

[jeshoyt]

Originally Posted by 00f250

Sounds like a fairly easy job. Thanks.

No problem man! Glad we could help.

[mschn99]

make sure to index the driveline as well so the splines go back together the same, its even more important to do that as is it to have it indexed on the rear diff and t case.....

[jeshoyt]

Yes, you will need to make 3 total marks, one on the driveshaft on the forward of the boot(the part where the female portion of the spline is), one on the actual rear portion of the driveshaft where the male part of the splines are, and one somewhere on the differential so you can line the shaft up the way it came out. It's as easy as it sounds.

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Last edited by jeshoyt : 08-13-2006 at 10:02 AM.

[RRlocoENGR]

I also found that the rubber bushing (carrier if you will) on my f350 is bad. It allows the driveshaft to slap on starts, making a thud!

I will be replacing that part and will do the grease job also.

Thanks