My Camry's so happy now that she has T-IV inside her again. She
> shifts so well with T-IV.
>
> About 3 weeks ago, I did a drain and refill with Mobil 1 Synthetic
> ATF, making the ATF about 45% Mobil 1 and 55% T-IV (we'll say 50/50). >
> Today I did an ATF oil cooler hose flush to replace the 50/50
> mixture of Mobil 1 and T-IV with 100 percent T-IV (or near 100 percent). >
> I quickly noticed an improvement in shifting during the first 40 miles
> of driving after the flush. I'm sure Mobil 1 Synthetic ATF is a great
> ATF; it's just not meant for my Aisin U250E tranz. I don't think I'll
> ever veer from Toyota T-IV again.
>
> Smooth shifting, no more occasional jerkiness, less shudder when
> switching into and out of reverse, and fewer down-shifting probs. >
> The U250E's total capacity is probably 8.5 quarts (the Amsoil site
> doesn't know). To perform the flush, I bought 13 quarts (a case and
> a loose quart) from Machens Toyota yesterday for $4.83 per quart.
> Sure beats the $7 they originally quoted me.
>
> To start things off, I did a drain and refill of the pan's 3.7 quarts.
> Then did a flush using the tranz-in hose, which enters the transmission
> at a lower spot than the tranz-out hose, unlike what the author of the
> tutorial mentioned (he said it's "usually the upper of the two
> lines"--not so with the '06 Camry). With the '06 Camry, the tranz-in
> hose (or return hose) is closer to the driver side than the passenger > side.
>
> The hose's spring clamp opened by using an 8-inch slip-joint pliers
> I bought from Harbor Freight. A second, smaller pliers was also helpful
> during the re-application of the clamp to the hose. There's limited room
> to work in there. Both pliers came in handy, the bigger and the smaller. >
> After the 3.7-quart drain and refill, I flushed with 8 quarts of T-IV
> ATF. (Actually, I flushed with about 7.3 quarts and added another 0.7
> quart after I had driven the car for about 34 highway miles to get the
> ATF nice and hot for more accurate checking on the dipstick--didn't want
> to overfill).
>
> I may yet add another 0.25 or 0.3 quart after checking the dipstick level
> after a 100-mile trip to St. Louis. That ought to get the ATF nice and > hot.
> Looks like the dipstick shows I can put in another 0.25 or 0.3 quart. But
> I'll wait for the 100-mile drive to verify. Right now when hot, the fluid
> level on the dipstick is midway between the 2 cool zone notches and the
> 2 hot zone notches.
>
> During the flush, I added a quart or 1.2 quarts at a time while the car
> idled, but I would have to turn off the car after a quart or so because
> I couldn't keep up with the faster outflow of the ATF into the drain pan.
> When I saw the stream from the hose begin to break up, I'd shut the car
> off and pour in a second quart. Then I'd turn the car back on and let it
> idle while pouring another quart or so down the ATF dipstick tube. >
> Sorry to be so detailed, but I'm making notes so I can review them if
> I ever need to do another flush. I'll probably only do drain and refills
> from here on out, though, because they're faster than flushes. I did
> enjoy my first ATF flush, but I think the second time would just seem
> like a chore. However, first time was very interesting and fun. > Definitely
> worth doing at least once.
I'm not sure, but I think your problem was mixing different lubricants. The transmission would not like that at all. It is a bad practice to do that, and I think you just learned why.
Don't bother with the last cup or two of fluid, it won't change anything except how long it takes to add the full quart.
You have far more serious issues than being a cup low on fluid. The most critical issue is that you did not flush the transmission at all.
Please tell me that you did not reuse the clamps. Please! Those clamps are one-time use only. If you have to take them off, they should be discarded and replaced with a standard hose clamp, or another clamp like the one you just tossed into the trash -- except you didn't toss it, did you?