The NV125 is relatively a simple case to work on. It has three major bearings, three seals, a drive and driven sprocket, chain and other smaller parts.
The ATC500 on the other hand is a bit more complex. Unlike its predecessor it replaced the planetary gear with a clutch pack and contains a pump and a shift motor. This unit was introduced in late 2003; around October of '03.
If you are not sure which case you have you can simply go to the case and check for the transfer case shift motor. There are other exterior difference but this is the most obvious.
Internally you already know about the planet and clutch pack as well as the pump. You can also look at the chain. The chain has one blue link for the NV125 and two blue links for the ATC500.
The ATC-500 also has four instead of three major bearings and two plastic dust covers (the other having only one metal dust cover).
More information will be coming for the ATC700 as it comes in. Stay tuned!
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BMW X5 ATC-500 TRANSFER CASE VIDEO HOW TO REPLACED THE CHAIN THANK YOU estevenviveros@hotmail.com
BMW X5 ATC-500 TRANSFER CASE DISMANTLE VIDEO DO YOU HAVE ONE WILL BE VERY NICE I SEEN ONLY NV125 VIDEO THANK YOU I ALL READY INSTALL 3 CHAINS WITH THAT VIDEO
We do not have a video for the BMW X5 ATC-500 Transfer Case at the present time. To replace the chain you will need to open the case, remove one of the sprockets and replace the chain. You will need rtv to put the case halves back together.
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