Possible for gear oil to get in auto transmission Fj62?

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wileycoyote

wileycoyote

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So I purchased a super clean Fj62 with 200k for wife's rig. All was good til one morning I drove it and it wouldn't hardly go. No symptoms the day before. It was like the tranny was just spinning. I noticed the atf fluid was way over filled and the transfer case was very low. I did the Rodney flush and changed filter. Filled xfer case and topped off atf. Everything runs fine. Just kinda wierd and wondering if anyone else ever had this issue. Thanks.
 
Are you sure that it is supposed to be using ATF? Not overly familiar with the A440 in the 62s but I know the 60 calls for 80w90 oil in the tranny and t-case. Check my sig for the FSMs.
 
The transfer case input shaft seal is worn and the gear oil is contaminating the tranny. Unfortunately the FJ62 uses ATF in the tranny & gear oil in the transfer case so when the seal leaks oil contamination occurs.

The only fix is to replace the transfer case input shaft seal. Big job.
 
I'd like to know this as well. Ok to run ATF in the split case? I have the AA adapter to 4l60E and there is a sealed bearing in addition to the input seal on the tcase. These both failed and I had an overfull tcase of ATF and all was mixed. I'm sure it wasn't good for my transmission.

Also, I did a full reseal of the Tcase in a weekend. Not a difficult job - but very annoying to have that seal fail and pump gear oil into your transmission. I left the transmission in and just pulled the tcase apart under the truck. Very linear process.
 
sgiandubh said:
I'd like to know this as well. Ok to run ATF in the split case? I have the AA adapter to 4l60E and there is a sealed bearing in addition to the input seal on the tcase. These both failed and I had an overfull tcase of ATF and all was mixed. I'm sure it wasn't good for my transmission.

Also, I did a full reseal of the Tcase in a weekend. Not a difficult job - but very annoying to have that seal fail and pump gear oil into your transmission. I left the transmission in and just pulled the tcase apart under the truck. Very linear process.
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How long did it last before it failed. I'll be watching mine closely as I just put it together. At least you can pull the split case and adapter off and reseal it on the bench. I can't remember if I put sealer on the spline when I put it back together either. But I remember my phone number growing up on the farm decades ago. Why is that?
 
Shes Mad said:
How long did it last before it failed. I'll be watching mine closely as I just put it together. At least you can pull the split case and adapter off and reseal it on the bench. I can't remember if I put sealer on the spline when I put it back together either. But I remember my phone number growing up on the farm decades ago. Why is that?
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The adapter and rebuilt split case had about 40k miles on them when I noticed the failure. The adapter was installed by the PO but upon disassembly the spud shaft splines were RTVd well, so that wasn't the culprit. I emailed AA about the issue and they said that RTV on the splines helps but the seal in the spud shaft bearing is key to keeping gear oil and ATF separate. They also did not recommend relying on the input seal to prevent mixing of the fluid. So I replaced the bearing and all tcase seals. I have not personally confirmed this, but I have heard that the input seal on the 62 split case is an improved double-lip design. Ostensibly to prevent this very thing from happening. Bryce at Cruiser Outfitters did confirm that I could not use the 62 input seal in my 34mm 60 case.

I'm a little disappointed in the longevity of those seals (my experience may not be typical) and will consider the bearing and input seal to be PM items.
 
As far as the 4l60e/AA adapter/split case goes; I wonder if drilling a small weep hole in the AA housing would allow any fluid to run out before they mix...?

Otherwise doesn't the fluid have to fill the AA housing to mix?

Or does it actually run up the input shaft past the seal, up the spud shaft past the sealed bearing, up the trans output shaft and into the transmission?
 
I noticed the atf fluid was way over filled and the transfer case was very low.

At the risk of sounding like a broken record here on Mud, check your transfer case vent and run a tube up the firewall. See if the problem returns. Much easier than replacing the seal..... (and venting the xfer case properly should be done regardless of leaks or seal condition).
 
SteveH said:
At the risk of sounding like a broken record here on Mud, check your transfer case vent and run a tube up the firewall. See if the problem returns. Much easier than replacing the seal..... (and venting the xfer case properly should be done regardless of leaks or seal condition).
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Agreed. First thing I checked when I noticed mine had failed and mixed the fluids. While the vent is not extended on mine, it was clear and I could blow through it so presumably was venting properly.

I'm not sure if you could create a weep hole to allow the fluid to drain/give you an indication that a seal had failed. But that would be cool. The way the AA adapter is there isn't much space between the mounting surface of the adapter and the t case input seal. The AA sealed bearing isolates the transmission (and adapter cavity) and the input seal isolates the transfer case.
 
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