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#1
07-23-2024, 08:33 PM
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Question About Transfer Case Actuator Gear
on paper, it makes sense to choose metal over plastic but at the same time the original transfer case actuator gear lasts a long time till it fails so im not sure which one would be a better pick 
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#2
07-23-2024, 08:41 PM
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With MTBF of 100,00 miles or more I would personally rather wear the plastic gear than worry about wearing out the drive gear on a harder metal gear.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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#3
07-24-2024, 02:26 AM
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Quote:
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#4
07-24-2024, 06:57 AM
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Failure is usually due to a low amount of grease over time. A new gear was installed on mine shortly after buying it. It had the trifecta lights on. The gear was worn out on one side. A carbon fiber gear and high temp synthetic grease fixed it right up.
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'06 X5 3.0i - bought @143,123 miles (12/26/20)
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#5
07-24-2024, 08:13 AM
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Quote:
You are introducing a big unknown. If the new big gear isn't a perfect mate with the drive gear you risk it warning out the drive gear. It could be perfect and last a million miles it could be 1/10th of a % off of perfect and chewb away the drive gear in 2000 miles. I like the idea of the carbon fiber. Sent from my iPhone using Tapatalk Pro
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2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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#6
07-24-2024, 08:53 AM
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The factory set up has very little grease. I drowned a carbon fiber gear in high temp synthetic grease. The new gear is slightly wider too. I can tell you it works. You can feel the Xdrive working. Especially in rain and take off.
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'06 X5 3.0i - bought @143,123 miles (12/26/20)
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#7
07-24-2024, 11:54 AM
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My original gear failed at nearly 300 tkm. I turned the gear 180 degrees, cleaned debris and re-greased. It has now lasted another 100 tkm. Nowadays the gear is also available as original BMW part.
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E39 530dA -02 M-Sport Messing metallic E53 X5 3.0dA -06 Sport Stratus grey E70 X5 40d -12 M-Sport Space grey
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#8
07-25-2024, 01:48 PM
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My original gear failed at about 250,000 miles. Replaced it with a carbon fiber reinforced plastic gear. Been about 30,000 miles and still working fine. I expect the car will be done before the gear is.
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#9
07-25-2024, 08:59 PM
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Same as others. CRP gear that was heavily lubed. Been good for ~30k miles now. Original failed at about 100k.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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#10
07-27-2024, 03:59 AM
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After reading a few responses I like the idea of carbon fiber but I already bought the metal gear, if anything fails or breaks I will definitely buy a carbon fiber gear next time unless I should just switch to carbon fiber right now
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