Originally Posted by john_pifer
I have a 2007 Toyota Tacoma PreRunner with TRD Off-Road package, V6, and Aisin A750E automatic transmission (the A750F is the 4WD version, which is what you have).
These are solid transmissions.
If you go to Wikipedia entry for these transmissions, you'll see that they were also used in the V8 version of the 4Runner, as well as in the Sequoia and Lexus GX470, so they're pretty understressed in V6 applications.
I bought my truck new in 2007 and performed the first full trans fluid swap at 100K, then, again, at 200K. I used Toyota WS fluid both times. I think it shifts great. It's not the most refined auto transmission in the world, but it's stout enough and still performs wonderfully, even at 225K miles. I have towed a few times with it, but not much. Mostly driven as a car, and I've done quite a bit of hauling motorcycles in the bed. Light use, mainly.
It does have an issue where, rolling at, like 5-10 mph, when I believe it should already be in 2nd, it will still be in 1st, and, when I accelerate, it will abruptly run out 1st gear and then quickly shift to 2nd. It tends to do this more frequently if I'm rolling down a slight incline (there's a spot in the parking lot at work where it'll do this every time). But if I let it keep rolling without applying throttle, it'll go ahead and, almost imperceptibly, shift to 2nd and then I can go ahead and accelerate smoothly, in 2nd gear. Since I'm very familiar with the transmission, I can easily avoid this and prevent any rough operation. But, if someone wasn't familiar with the unit, I could see it being considered as a rough shift.
It also has a bit of a driveline vibration that will be noticeable if I apply, say, 75% or greater throttle, from lower speeds (say, anywhere from 5-25 mph). From what I understand, this could be coming from the torque converter, and I've read that adding some of the additive Lubeguard Red can cure this. However, I haven't done it, because I rarely accelerate the truck hard from lower speeds. It's also possible that the vibration might not be coming from the transmission at all, but maybe from the driveshaft (u-joints or center driveshaft carrier bearing). I'm not sure about the T4R, but the Tacomas use a 2-piece driveshaft with 3 u-joints. I replaced all 3 at around 80K when a bearing cap on the rear-most u-joint dried out, and started squeaking when I backed up. But, now, of course, they have 145,000+ miles on them. I used Auto Zone Duralast Gold (non-greasable) u-joints when I replaced them. At any rate, I'm happy with the performance of this transmission. It's my daily driver, and I routinely do 90 mph or more in the truck, and there are no signs of it giving up any time soon.
There is a rough shift here and there, from time to time, usually when I make some sort of abrupt movement at a weird time with the gas pedal. But that's to be expected of any autobox.
Your idea of a Magnefine filter - I think you'll find that it won't do much, if anything. But it probably can't hurt anything.
As far as Maxlife fluid, I've read reports of a lot of guys using Maxlife in these transmissions without any problem. So, I'd say, if you want, go ahead and try it. If you do, please report back on your results. Personally, I've chosen to just stick with OEM fluid, especially since I didn't change mine for the first time until 100K, then again at 200K, used WS, also. If it makes it to 300K, I'll use WS again, because, at that point, stick with what has worked well enough, right?
Can you describe with a bit more detail, what yours is doing?
Originally Posted by john_pifer
I have a 2007 Toyota Tacoma PreRunner with TRD Off-Road package, V6, and Aisin A750E automatic transmission (the A750F is the 4WD version, which is what you have).
These are solid transmissions.
If you go to Wikipedia entry for these transmissions, you'll see that they were also used in the V8 version of the 4Runner, as well as in the Sequoia and Lexus GX470, so they're pretty understressed in V6 applications.
I bought my truck new in 2007 and performed the first full trans fluid swap at 100K, then, again, at 200K. I used Toyota WS fluid both times. I think it shifts great. It's not the most refined auto transmission in the world, but it's stout enough and still performs wonderfully, even at 225K miles. I have towed a few times with it, but not much. Mostly driven as a car, and I've done quite a bit of hauling motorcycles in the bed. Light use, mainly.
It does have an issue where, rolling at, like 5-10 mph, when I believe it should already be in 2nd, it will still be in 1st, and, when I accelerate, it will abruptly run out 1st gear and then quickly shift to 2nd. It tends to do this more frequently if I'm rolling down a slight incline (there's a spot in the parking lot at work where it'll do this every time). But if I let it keep rolling without applying throttle, it'll go ahead and, almost imperceptibly, shift to 2nd and then I can go ahead and accelerate smoothly, in 2nd gear. Since I'm very familiar with the transmission, I can easily avoid this and prevent any rough operation. But, if someone wasn't familiar with the unit, I could see it being considered as a rough shift.
It also has a bit of a driveline vibration that will be noticeable if I apply, say, 75% or greater throttle, from lower speeds (say, anywhere from 5-25 mph). From what I understand, this could be coming from the torque converter, and I've read that adding some of the additive Lubeguard Red can cure this. However, I haven't done it, because I rarely accelerate the truck hard from lower speeds. It's also possible that the vibration might not be coming from the transmission at all, but maybe from the driveshaft (u-joints or center driveshaft carrier bearing). I'm not sure about the T4R, but the Tacomas use a 2-piece driveshaft with 3 u-joints. I replaced all 3 at around 80K when a bearing cap on the rear-most u-joint dried out, and started squeaking when I backed up. But, now, of course, they have 145,000+ miles on them. I used Auto Zone Duralast Gold (non-greasable) u-joints when I replaced them. At any rate, I'm happy with the performance of this transmission. It's my daily driver, and I routinely do 90 mph or more in the truck, and there are no signs of it giving up any time soon.
There is a rough shift here and there, from time to time, usually when I make some sort of abrupt movement at a weird time with the gas pedal. But that's to be expected of any autobox.
Your idea of a Magnefine filter - I think you'll find that it won't do much, if anything. But it probably can't hurt anything.
As far as Maxlife fluid, I've read reports of a lot of guys using Maxlife in these transmissions without any problem. So, I'd say, if you want, go ahead and try it. If you do, please report back on your results. Personally, I've chosen to just stick with OEM fluid, especially since I didn't change mine for the first time until 100K, then again at 200K, used WS, also. If it makes it to 300K, I'll use WS again, because, at that point, stick with what has worked well enough, right?
Can you describe with a bit more detail, what yours is doing?
I think you described the behavior I'm seeing, sounds like it's a normal trait.
My the 4Runner has a single piece driveshaft, there's some caked on grease around them, I need to lightly clean them and see if they have zerks
