AT Transmission Performance/Reliability
Team Owner
Joined: Mar 2006
Posts: 20,172
Likes: 1,818
From: Bakersfield
I have a challenge for some of you, may be you've encountered this. The reason I started this thread was because over the last snow storm here in NY, I decided to go into parking lot and mess around. Ive done this plenty of times to keep some what fresh with my driving over the winter, its fun, and up until now, not stressful on the car. The motor didnt really go above 4000 RPM, VSA was off. I was just pulling the E brake and I did two reverse donuts.
The next day 2nd and 3rd gear were a mush and accelerating the car from a dead stop I could tell there was a lot of slipping. The revs would go up, the trans would catch and then it would slowly decrease and the car would accelerate, almost like I was driving stick shift.
Upon inspection from the transmission shop there were no codes and the transmission oil didnt seem burnt so it didn't over heat. Any idea what actually happened to the transmission?
The next day 2nd and 3rd gear were a mush and accelerating the car from a dead stop I could tell there was a lot of slipping. The revs would go up, the trans would catch and then it would slowly decrease and the car would accelerate, almost like I was driving stick shift.
Upon inspection from the transmission shop there were no codes and the transmission oil didnt seem burnt so it didn't over heat. Any idea what actually happened to the transmission?
Think about it this way, low speed high load creates tons of heat. Shifting gears creates a lot of heat. If you were out there spinning donuts there was probably a lot of 1-2-3 3-2-1 shifting going on and the whole time the torque converter is slippnig more than normal for a longer time period than normal. So the bulk fluid temp heated up and most importantly, the fluid in the clutch packs probably fried.
I can literally burn the transmission in my GN up in minutes. I've burned second gear to the point I had to shift 1-3 just to drive it back to the transmission shop. I never made it home from the shop after the rebuild because I was screwing around. The key to burning mine up is lots of full throttle takeoffs, slowing down, and taking off again.
You more than likely got the fluid really hot, line pressure dropped, and that made the clutches slip. Now they're burned up permanently.
Honestly, the only thing you can do is put pure Type F in there and hope it lasts a little longer. I would use the cheapest Type F you can find because it's probably not going to be in there long.
In the future, you're best off shifting manually and leaving it in one gear. 1st gear will produce the least transmission heat.
I'm assuming the level was checked and with the engine off, right?
Thread Starter
Racer
Joined: Jun 2011
Posts: 466
Likes: 19
From: Mineola, NY
Thread Starter
Racer
Joined: Jun 2011
Posts: 466
Likes: 19
From: Mineola, NY
What you were doing is one of the hardest things you can do to a transmission.
Think about it this way, low speed high load creates tons of heat. Shifting gears creates a lot of heat. If you were out there spinning donuts there was probably a lot of 1-2-3 3-2-1 shifting going on and the whole time the torque converter is slippnig more than normal for a longer time period than normal. So the bulk fluid temp heated up and most importantly, the fluid in the clutch packs probably fried.
I can literally burn the transmission in my GN up in minutes. I've burned second gear to the point I had to shift 1-3 just to drive it back to the transmission shop. I never made it home from the shop after the rebuild because I was screwing around. The key to burning mine up is lots of full throttle takeoffs, slowing down, and taking off again.
You more than likely got the fluid really hot, line pressure dropped, and that made the clutches slip. Now they're burned up permanently.
Honestly, the only thing you can do is put pure Type F in there and hope it lasts a little longer. I would use the cheapest Type F you can find because it's probably not going to be in there long.
In the future, you're best off shifting manually and leaving it in one gear. 1st gear will produce the least transmission heat.
I'm assuming the level was checked and with the engine off, right?
Think about it this way, low speed high load creates tons of heat. Shifting gears creates a lot of heat. If you were out there spinning donuts there was probably a lot of 1-2-3 3-2-1 shifting going on and the whole time the torque converter is slippnig more than normal for a longer time period than normal. So the bulk fluid temp heated up and most importantly, the fluid in the clutch packs probably fried.
I can literally burn the transmission in my GN up in minutes. I've burned second gear to the point I had to shift 1-3 just to drive it back to the transmission shop. I never made it home from the shop after the rebuild because I was screwing around. The key to burning mine up is lots of full throttle takeoffs, slowing down, and taking off again.
You more than likely got the fluid really hot, line pressure dropped, and that made the clutches slip. Now they're burned up permanently.
Honestly, the only thing you can do is put pure Type F in there and hope it lasts a little longer. I would use the cheapest Type F you can find because it's probably not going to be in there long.
In the future, you're best off shifting manually and leaving it in one gear. 1st gear will produce the least transmission heat.
I'm assuming the level was checked and with the engine off, right?
The only thing is the transmissions fluid didn't over heat according to the shop. He pulled the dip stick and it didnt smell burnt at all he said. Thats why Im puzzled as to what happened.
It actually threw a code today so the transmission is being redone on tuesday. Im curious to see what the code reads but never the less redline type F and D4 is going in that bad boy after its done
Mr. Detail
Joined: Oct 2011
Posts: 1,104
Likes: 200
From: Arlington, TX
It's not a bad idea still. When you shift in manual mode, things can change. I don't know about the TL specifically but when you go over to manual mode or on an older non computerized transmission you go down to 1,2, or 3rd gears manually, line pressure is raised for firmer shifts and more holding power because it assumes you're going to be using it harder.
Wish we had throttle cables, I could adjust the one from the throttle to the transmission tighter and get firmer shifts on my old 4th gen Accord. Not possible now with DBW.
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Oct 8, 2015 11:16 AM