HAVE A 1999 GMC SIERRA 1500 WONT MOVE IN FOWARD OF REVERSE
WE DROVE IN LAST NIGHT AND WHEN IDLING IN SHED HEARD A SLIGHT NOISE FROM THE TRAN AREA . STARTED THIS MORNING NO NOISE ALL SEEMED OK DROVE ABOUT 2 BLOCKS TO SHOP AND PARKED TO LET TRUCK WARM UP AND WHEN WE PUT IT BACK IN GEAR IT WOULDN'T MOVE IN FOWARD OF REVERSE. WE TURN IT OFF FOR ABOUT 3 MINUTES AND STARTED IT UP AND ALL WORK. WE POWER BRAKED AND SPUN THE TIRES BUT AGAIN AFTER ABOUT 2 MINUTES HEARD A LIGHT NOISE FROM THE TRANSMISSION AND AFTER ANOTHER MINUTE NO REVERSE OF FOWARD . IT IS JUST KEEPS CYCLING LIKE THIS ANY IDEAS
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unfortunately what it sounds like is the transfer case like you suspect. inside are bearings and gears and a chain what happens is the chain will stretch and cause this problem it will actually jump the teeth on the gears, you will need to have the chain replaced in the transfer case. sorry to have to tell you this but i hope it helps.
If noise is come from front end, and your truck is not moving at a stand still, it's going to be your ball joint's, bad news, if there OE there will be no grease fitting. New ones will come with grease fitting for future lube jobs on ball joint's.
Your sun gear shell (google it) has broken in your transmission. I'm guessing you only have 1st and 3rd forward gears? I have a 98 Z-71 and have been through 3 of them. The OEM shell is junk. When you take it to the tranmission shop, tell them to replace it with a hardened shell. My local transmission shop charged about $450 (parts and labor) to change the shell only. The very first time it broke (about 65,000 miles) they went ahead and rebuilt the tranny while they had it apart. If you've never had your tranny rebuilt, I reccomend doing it while they have it apart - they probably will, too. I have the advantage of knowing my mechanic since I was born (small town). He is as honest as they come and this was his suggestion.
Since he put the hardened shell in mine, I have had no problems.
i had to put a new trans in my 2000 jimmy about a year ago there is something inside called a "reverse hub" its made from aluminum and not very hard to break..when mine broke i was stuck trying to move in reverse and it heard a pop then a winding down noise and sure enough its the reverse hub to fix it i just had the trans rebuilt