SierraBronco's Build

[GreyZ]

Did a little digging into this question and discovered that on the Bronco there is no locking mechanism for 4H or 4L. @Snacktime could be on to something if this slippage pisses off the computers, and one of the (many) codes it throws is an AWD fault. A good comparison is the Raptor pickup does in fact have a locking ring, but the normal F150 is like the bronco and does not, causing overheating issues or codes when an overtorque situation occurs. It makes sense why our problems occurred on this trip where it was significantly warmer than last time, and when in 4L but not 2H. (With exception of one time in 2H. But…perhaps we didn’t wait long enough on the battery disconnect? That was on the first day of issues)

Does anyone know if there are clutch upgrades available for the advanced T-case?

Have you run in 4A at all? I forget but what is your effective final drive? (diff * portal reduction).
What fluid did are you running?
Did this ever happen before the fluid change?

Makes me wonder if any water got in a vent or something in the T case. I would say you are probably pretty aggresive on your Tcase clutches, but there are guys drag launching in 4A that is way way more stress than fully locked in 4L would ever be.

A fluid sample analysis could shed some light if it is work clutch disks.

I wonder how the electronics would like an atlas...

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[SierraBronco]

Have you run in 4A at all? I forget but what is your effective final drive? (diff * portal reduction).
What fluid did are you running?
Did this ever happen before the fluid change?

Makes me wonder if any water got in a vent or something in the T case. I would say you are probably pretty aggresive on your Tcase clutches, but there are guys drag launching in 4A that is way way more stress than fully locked in 4L would ever be.

A fluid sample analysis could shed some light if it is work clutch disks.

I wonder how the electronics would like an atlas...

We rarely use 4A. Only a few times in Wyoming winter and occasionally in sport before the 40’s.

Final drive is 5.734:1 so to get to same gear to tire ratio as stock we would be running 42” tires. Of course we aren’t factoring in the additional mass of the tires and how much more torque is needed for those.

Yes we aren’t doing hard launches, but super steep climbs with a much heavier vehicle. I do recognize the difference between slipping the clutch as needed vs already being locked in, but with the Raptor having the locking ring it seems Ford/BorgWarner identified a reason to not rely solely on the clutch for heavier use. I’ll ask the dealer to catch a sample for us to get analyzed.

Using Ford recommended fluid. Has had this fluid right before we did the portals so only recently had the problem. Also of note-full belly skids will retain heat. So again might make some sense as to why it started happening when it was hot, and would get progressively worse as the day goes on.

Just need a team of Ford technicians and I can be as cool as Ford factory racers and have an Atlas!

 

[GreyZ]

We rarely use 4A. Only a few times in Wyoming winter and occasionally in sport before the 40’s.

Final drive is 5.734:1 so to get to same gear to tire ratio as stock we would be running 42” tires. Of course we aren’t factoring in the additional mass of the tires and how much more torque is needed for those.

Yes we aren’t doing hard launches, but super steep climbs with a much heavier vehicle. I do recognize the difference between slipping the clutch as needed vs already being locked in, but with the Raptor having the locking ring it seems Ford/BorgWarner identified a reason to not rely solely on the clutch for heavier use. I’ll ask the dealer to catch a sample for us to get analyzed.

Using Ford recommended fluid. Has had this fluid right before we did the portals so only recently had the problem. Also of note-full belly skids will retain heat. So again might make some sense as to why it started happening when it was hot, and would get progressively worse as the day goes on.

Just need a team of Ford technicians and I can be as cool as Ford factory racers and have an Atlas!

Yeah. Definitely doesn’t sound abused. I figure its either water in the fluid or some heat related issue. Do ya’ll have a custom exhaust that runs near by?

 

[SierraBronco]

Yeah. Definitely doesn’t sound abused. I figure its either water in the fluid or some heat related issue. Do ya’ll have a custom exhaust that runs near by?

We have this guy but it’s all factory by the transfer case and not under the skid. Though maybe there would be some benefit to wrapping the exhaust that is under the skid, now that you mention it.

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