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hey guys, i have a 98 2500 Z71 that is having some issues. it started a few months ago when i was helping a buddy move. at first the tranny would shift outta od all on its own. this lasted a couple months. then while i was headed home with my buddies stuff i lost all gears. the sound that came from the drivetrain was a sound like it got put in park while the truck was still moving. like i said i lost all gears and it has got me puzzled. any ideas thoughts or comments would be great. my tranny is 4L80E with a np 241c t-case.


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The ratcheting sound you are describing means something broke inside the transmission.
Probably a gear.
Sounds like you are going to need to have it removed, taken apart and repaired.
You drop the pan and will probably see metal chunks.


   
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Could it be the transfer case


   
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Yes, it is possible, but with the first problem of trans going in and out of overdrive, this cannot be the transfer case. So, it seems like a transmission problem.
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I will drop the pan and see if there is any metal or any thing else that doesn't belong in it.


   
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