I'm new here but have been following this site since I purchased my '07 TRD Sport used with 11k mi back in March '08. Great information so far! Leaf Spring TSB and other TSB information has been invaluable but couldn't find any threads on the following:
When power is removed from the drive train and vehicle begins to coast or slows down from 65 through 55 mph, a higher pitched howling can be heard coming from the rear end of the truck. Didn't notice too much at first but I have 22k mi on the truck now and can't help but hear the noise. I took it in to the dealership for inspection . . . a new LSD has been ordered and will be replace the existing one tomorrow under warranty. Service tech said it is something mechanical but I didn't get specifics.
I've also noticed the automatic transmission has a shudder or hard shift from 1st to 2nd gear from time to time and have experienced a hard shift and audible clunk when shifting into and out of 4-wheel drive at modest speed (less than 20 mph) and while not applying much power to the drive train (transfer case issue maybe). Due to the issue with the differential, I brought these issues up with the service tech as well and they said they would look into it after the differential was replaced, though he did mentioned that another guy just last week also came in with the same 4x4 shifting complaint.
Has anyone else experienced these issues or have any thoughts or comments? These issues along with the leaf spring issue and I can say I'm a little dissappointed so far. Can't complain about the dealership though . . . new springs and soon to be new LSD so far . . .