Posted by Alan Bowes on October 18, 1997 at 17:18:07:
In Reply to: Re: Drive train noise addendum posted by dave on October 17, 1997 at 11:28:25:
: : The noise only occurs when letting off the gas.
: : There is no noise on start up, or, while driving along.
: I take it you are in gear and moving. Then you let
: off and a growling noise starts. Try this, remove
: the rear drive shaft at the rear u-joint, then
: remove the cotter pin that locks the pinion bear
: nut in side of the yoke,then tighten the pinion
: bearing nut, I can't find the torque spec. but get
: it tight. If the truck does not have front lockout
: hubs the front may have some wear on it to,
: I would do the front too. Make sure there is
: plenty of grease in the diffs. check the u-joints.
************
Right after removing the rear drive shaft, try driving it around with front-wheel drive only and see if you can still hear the sound. That may help quickly narrow the search. With no load on the rear end, it shouldn't make much, if any, noise. Of course, you could be absolutely sure by pulling the rear axle shafts (a 5-minute job) which would totally eliminate any movement inside the rear axle.
Alan