driveline clunk - Diesel Forum

gmc89 · 11-18-2009, 07:33 PM

I have a 99 ford diesel dually,truck has about 128 k on it when shifting from reverse to forward or vice versa there is quite a clunk in the driveline. It does not do this when the truck driveline is cold. I had all three ujoints replaced but the noise is still there. Any help would be appreciated. Thanks.

climber417 · 11-18-2009, 07:57 PM

maybe the carrier bearings?? Mine is loose and shimmies a little

**woodnthings8** · 11-18-2009, 08:35 PM

Try lubricating the splines on the driveline. Ford has a TSB out on this. Here is a article off the net that should show the needed instructions.

Spline Lube

knoweigh · 11-18-2009, 08:41 PM

another vote for checking the splines.........Very common problem and produces the symptoms you're describing.
I assume engine & tranny mounts have been checked

gmc89 · 11-20-2009, 07:33 PM

Thanks, i did do the slip yoke and it was quiet for a few shifts. the noise seems to come from the rear differental.I have not yet checke3d the mounts but will do that,though the sound seems to be different.

CPUNeck · 11-21-2009, 09:38 AM

Without going into to much "tech", I gave my pinion about an 1/8 turn and that helped my problems ALOT back in the day. Seems after x miles, normal wear of the pinion races causes the preload to lessen... just sayin it worked for me, I know the crush sleeve is delicate, tighten to much and your going into your diff! PITA

gmc89 · 11-23-2009, 07:40 PM

Thanks cpuneck,will look into that. My nephew ( a young mec) suggest maybe shimming the axles as he thought that there might be to much play in the differential.