Okay, so on a 98 degree day I was haulin my 10K toyhauler back from Glamis sand dunes. At a filling station I noticed that trans fluid was dripping from the transmission cross member under the truck. In a panic I checked the fluid level on the trans dipstick and at an engine temp. of 200 degrees, and trans temp at 200 degrees, it registered above the high mark. My question ... is it possible that because the level was high that the vent in the tranny just "puked out" the excess fluid ? On the drive home I was careful to monitor the trans temp (200 or lower) and the Edge did not show any slip, nor did the tranny limp or operated any differently. Once back at home and parked for 4 days, there was no sign of any trans fluid continuing to leak from any seal or gasket. I took it for a drive and it seemed to operate normally. Any input or suggestions would be helpful and thanks !

What is the tranny fluid level now?

Moving to Allison OEM for continued discussion.

At cold reading...normal level. I will check again once at operating temp.

Has your truck had the Trany cooling line change yet? Usually just a drip but that red fluid can get you worried.

The consensus here is that when hot, the level should be in the middle of the 'full-hot' range.....nothing above that.

Has your truck had the Trany cooling line change yet? Usually just a drip but that red fluid can get you worried.

what tranny cooling line change?

X2, This is what we are led to belive with our manuals.

Set your level to the bottom half of the HOT band at 175 to 180F.
This is about 2/3 quart out from the top of the HOT band (HOT Full).

You can go lower (a full quart +) if you have the deep pan.

You'll be amazed at the temperature change.

Set your level to the bottom half of the HOT band at 175 to 180F.
This is about 2/3 quart out from the top of the HOT band (HOT Full).

You can go lower (a full quart +) if you have the deep pan.

You'll be amazed at the temperature change.

Thanks for the info...I will check again tomorrow.

Has your truck had the Trany cooling line change yet? Usually just a drip but that red fluid can get you worried.
what tranny cooling line change?
I believe the 2006 model has problems with the cooling line, but I don't think the older trucks (2005 and older) have this problem.

The consensus here is that when hot, the level should be in the middle of the 'full-hot' range.....nothing above that.
Set your level to the bottom half of the HOT band at 175 to 180F.
This is about 2/3 quart out from the top of the HOT band (HOT Full).

You can go lower (a full quart +) if you have the deep pan.

You'll be amazed at the temperature change.
From everything I've read, these are good advice.

Set your level to the bottom half of the HOT band at 175 to 180F.
This is about 2/3 quart out from the top of the HOT band (HOT Full).

You can go lower (a full quart +) if you have the deep pan.

You'll be amazed at the temperature change.

X2, I overfilled by about a 1/2 qt and was running an extra 15 degrees on average. It surprised me...

X2, I overfilled by about a 1/2 qt and was running an extra 15 degrees on average. It surprised me...



Why would slightly over filling lead to higher temps? I noticed that at operating temp, the level on the stick is slightly above full hot. Probably best to drain a little off by removing the trans filter ? I figure about 1/4 to 1/2 quart over-filled.

The fluid gets up into the moving parts. This creates more drag and more heat.

It also can create some greasy shift because of more air entrained in the fluid.

The bottom line is that its NOT GOOD to overfill.

The fluid gets up into the moving parts. This creates more drag and more heat.

It also can create some greasy shift because of more air entrained in the fluid.

The bottom line is that its NOT GOOD to overfill.


Thanks and noted....:)

Dealership that I purchased the truck from was who over-filled the tranny. Not a very nice thing to find out while 350 miles from home is the middle of the desert. I will definately adjust the level asap. Thanks everyone for all the info.

What's in the tcase?

I drove mine in 4wd from Glamis to Westmorland.

Pulled in the shell station and had fluid everywhere. Assumed pump rub or trans. Truck was not hot. Realized it was the oil I had just put in the tcase coming out the over flow. Just wondering as sometimes people put trans in the tcase.

Hope all is well.