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Old 05-19-2019, 05:20 PM   #1 (permalink)
axysassault
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Where did my tranny fluid go? Am I crazy?

So I've tried searching to no avail.

I did a drain, spin-on and refill with 7.4qts of transynd a few weeks ago. (Shallow pan) I checked it and it seemed to be at a legit level.

Now I go to hot check it yesterday (about 150deg) and it's not even at the cold hash marks. Maaaaaybe just at the bottom end of it.

Obviously I am concerned that it's too low and I don't wanna screw the tranny, but it doesn't overheat, it shifts fine with no slipping or burning smell and there are no leaks.

The manual says it only takes about 1/2 qt to bring it up on the dipstick.

Anyone have experience with having to add more than 7.4qts? Is there something obvious I'm missing?

And yes it was on level ground in my garage.

Unfortunately I have to wait till Tuesday to buy more fluid cuz it's a holiday Monday tomorrow.

Cheers



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Old 05-19-2019, 11:09 PM   #2 (permalink)
davester
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When you refilled it, did you run the motor and shift through the various gears, then check the fluid level?

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Old 05-20-2019, 01:43 PM   #3 (permalink)
axysassault
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Quote:
Originally Posted by davester View Post
When you refilled it, did you run the motor and shift through the various gears, then check the fluid level?
I most definitely did not. Duh.
Probably my issue.
I even bought my filter and fluid from the local Allison shop (Wajax) and they straight up told me, 7.4qts for drain and refill with filter change.

So it didn't even come to mind to run it through the gears. Now that I think about it and as I write this, I may have let it drain over night as I was going to drop the pan and do the internal filter as well, but ran outta time.

So that also may have contributed to my issue.

Too many PBRs between projects me thinks....

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Old 05-20-2019, 04:05 PM   #4 (permalink)
mp06011999
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FWIW.... in addition to the cycling of the tranny when checking the fluid....

Allison says don't touch the internal until overhaul time, iirc.
I measure what comes out on tranny fluid changes so I'm sure to put back in at least what came out.
Over / under filling by a 1/2 quart won't hurt anything so if in doubt, start by adding a 1/2 quart.
I used to stress over getting my fluid fills "perfect". Anymore, if it's in the safe zone, it's good. And if it's a tad over, it's good. I'm sure it's good even if it's a tad under, but I'm not quite "there" yet on my level of chill. Working on it - lol.

Ya got the most important part of the job just right - beers

Edit: I can't recall how much fluid I needed when I switched over to transynd a few years back. If that is what you are doing now, the procedure is two fluid changes with about 100 miles in between. And do the spin on anytime in that mix. I got that info from Tom Johnson on the phone. He's the guy that wrote the spec for Allison or something along those lines. He used to be on here, but I don't think so in years...
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Last edited by mp06011999; 05-20-2019 at 04:10 PM.
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