04-20-2020, 05:41 AM | #1 |
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Transfer Case Question
It looks like a few forum members had their Xfer case replaced under warranty.
1) What is the cause of the transfer case failure? 2) Is ignoring fluid leak the SOLE reason for the xfer case failure? 3) If you're out of warranty, where do you find a transfer case? I searched everywhere, don't see a used xfer case for F85 4) Can transfer case be rebuild? Thanks! |
04-20-2020, 09:21 AM | #2 |
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Yes a transfer case can be rebuilt and also one of the main reasons why you don't see transfer cases for the X5M/X6M is because they rearly go bad.
Also T case will go bad due to neglect and abuse.
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04-20-2020, 11:00 PM | #3 |
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Good to know! I was getting the impression that it's a common failure point on this platform.
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04-21-2020, 07:12 AM | #5 |
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I agree it seems uncommon as I do t see it here on board much. Mine failed from low fluid from a leak missed by CPO process. It felt like power was 'skipping' or there was a misfire under load.
Same with transmission and differential. They seem pretty durable. Might be worth poking around the previous gen board to see if issues there. Not sure same components....would have to verify. |
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04-21-2020, 10:23 AM | #7 |
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04-24-2020, 07:21 AM | #8 |
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The ATC 45L transfer case in the F86/F87 is nearly identical to the ATC450 used in the previous gen and holds very little fluid, just over half a quart (.6 Liter to be exact) so there is no buffer if you have a leak.
Also, the electromagnetic servo motor that drives the clutch plates is extremely sensitive to wear and fluid quality and needs periodic recalibration. For the DIY'ers (and those out of warranty), before spending $$$$ on a replacement transfer case, try a simple fluid change at re-calibrate in ISTA. This can solve many transfer case issues, especially once the mileage approaches 80K. I was getting constant codes with mine and truck was basically undriveable (felt like a severe engine miss) unless I disconnected the transfer case fuse and put it in rwd only, which was kinda fun for awhile but drives/handles nowhere near as good as AWD. I was told the transfer case would need to be rebuilt or replaced. A simple fluid change and recalibration in ISTA solved it. The recalibration is key. So for the DIY's out there or those out of warranty, try doing the above before spending thousands. |
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04-24-2020, 08:48 AM | #9 | |
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-misfire -slight hesitations under power load -not smooth power delivery under load And there were NO codes or dash lights for me. |
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04-24-2020, 10:59 AM | #10 | ||
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Pulling the fuse for the transfer case will disable it, light up you dash with DSC and 4x4 errors, force it in RWD mode only, and drive as such however all power delivery/engine missing sensations instantly disappeared. Good way to test if it's your transfer case or something else and kinda fun for a bit to feel how the truck drives in RWD mode only. |
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12-23-2020, 08:23 AM | #11 | |
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12-23-2020, 03:30 PM | #12 | ||
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07-06-2021, 08:31 PM | #13 | |
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07-07-2021, 10:35 AM | #14 | ||
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07-07-2021, 10:46 AM | #15 |
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Its been so long I don't remember the steps but I do remember it not being easy to find as ISTA is not intuitive in the slightest, especially for first time users. I'll spin it back up today to refresh my memory and post back in this thread the steps.
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07-07-2021, 11:00 AM | #16 |
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BTW, you can change transfer case oil without removing the cross member. Makes it much simpler and less then 10min to do this way. Grab a 14mm Allen wrench or 14mm hex socket, Dremel off 17mm in length, then grab long reach 14mm flex head wrench and compact fill pipe. I'll post links to Amazon for everything I used a bit later when I have a chance to dig them up.
Last edited by Sophisticated Redneck; 07-07-2021 at 11:35 PM.. |
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07-07-2021, 02:51 PM | #17 | |
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07-07-2021, 02:53 PM | #18 | |
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07-07-2021, 10:55 PM | #19 | |
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Posting instructions next Last edited by Sophisticated Redneck; 07-07-2021 at 11:36 PM.. |
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07-07-2021, 11:07 PM | #20 |
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Transfer Case Calibration:
Hook up battery charger (at least 10amp model) Turn on ignition all the way (do not start engine) and hok up E-Net cable/laptop. Once connected with ISTA select: Operations>>>Read Out Vehicle Data>>>Complete Identification. After tests are complete, clear any faults with the transfer Case. Next Select: Vehicle Management>>>Service Functions>>>Power Train Now Select: Transfer Box Transmission Control Unit>>>Transfer Box (VTG) Calibration A prompt comes up asking you if you have cleared all faults, engine off, etc. Select Yes to perform calibration. You will hear the servo motor in the transfer case engage for a few seconds. After this a screen will show the calibration results. Expect a correction in the area of 0.1-1.5 degrees. Close out ISTA and switch off ignition. Start engine and take for a test drive. Many will find this will fix the "engine miss/trailer tugging" sensation. I nearly replaced the transfer case in mine 40K miles ago as I was told it was bad. Now at 170K miles with original transfer case in an E70 that is tuned to 600hp and is flogged daily. F85's transfer case should easily reach this mileage with proper care (change oil and re-calibrate every 50K miles ). Last edited by Sophisticated Redneck; 07-07-2021 at 11:17 PM.. |
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07-07-2021, 11:27 PM | #21 |
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Here are the tools needed to change the transfer case oil without removing the cross member:
14mm Allen wrench (cut off 17mm and use in wrench below) https://www.amazon.com/Bondhus-12284.../dp/B002YNQP5A 14mm ratcheting flex head wrench: https://www.amazon.com/gp/product/B01F512F7Y Compact oil filler tube (use with your choice of hand pump, if you dont have a pump, search amazon, many pumps that already come with these fittings): https://www.amazon.com/Transmission-.../dp/B07G4D1DBZ Last edited by Sophisticated Redneck; 07-07-2021 at 11:33 PM.. |
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07-12-2021, 01:08 PM | #22 |
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Yeah, I removed my cross member when I changed my transfer case fluid. On that day though, we changed both front and rear diff fluid, tranny and transfer case.
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