Auto-Trans question
#1
Auto-Trans question
Not sure where to post this ..... So here it goes anyway. I recently hit the 30,000 mile mark, and I want to replace the transmission fluid (Auto-trans) I was told by one dealer that was not possible because the system is sealed, and they recommended I not break the factory seal unless something is possible wrong with the trans ... in other words they're telling me there isn't any maint. required.
Have any others come across this issue before?
Have any others come across this issue before?
#2
Not sure where to post this ..... So here it goes anyway. I recently hit the 30,000 mile mark, and I want to replace the transmission fluid (Auto-trans) I was told by one dealer that was not possible because the system is sealed, and they recommended I not break the factory seal unless something is possible wrong with the trans ... in other words they're telling me there isn't any maint. required.
Have any others come across this issue before?
Have any others come across this issue before?
#4
I don't think 30k is too soon for a transmission fluid change. Just like changing engine oil, fresh fluid will help ensure the life of the transmission, especially if the car is driven hard. Heat breaks down transmission fluid. I'd have it changed every 30k, but you need to find someone that has experience with the 5R55S. I'd call another dealer and see if they'll do it.
#6
They say that you need special equipment to change the fluid. There is a hole in the middle of the trans pan drain bolt where they evacuate and inject the fluid. This information comes from the factory service manual. Maybe someone has come up with another way to change the fluid. I personally haven't had to worry about it yet, but this is just what I read.
#7
The automatic transmission uses a whole buttload of clutches along with clutch disc(s) in the torque converter for lockup action. I'd say 30k-40k mile intervals are acceptable for the automatics. Unless the 5R55S doesn't generate heat and doesn't use clutches, I'd change out the fluid somehow. A typical automatic will go 100k miles w/o any problems on the original fluid until the friction modifiers all break down and the clutches wear out.
Luckily the TR-3650 manual doesn't suffer from the same problems.
Luckily the TR-3650 manual doesn't suffer from the same problems.
#8
My parents '90 Taurus auto went almost 300K miles with no tranny fluid changes. The engine died before the trans. If it can do that in 1990, I have faith that 100K change interval for a better designed tranny and better oil technology is sufficient.
#9
I'm skeptical about the 5R55S NEVER needing a fluid change, but hey, it's your car. I went with the TR-3650 because IMHO, a Mustang GT and a manual transmission were meant to be together.
#10
I went with the TR-3650 because IMHO, a Mustang GT and a manual transmission were meant to be together.
#11
They were lucky and in the minority. Even the Police Interceptor's 4R70W, 4R75W, and 4R75E require 30,000 mile fluid service intervals. What happens after 100k miles of not changing the fluid is the friction modifiers break down and the torque converter lockup clutch gets fried. Whenever the TC has to lockup or be commanded to slip, your car will feel like it is running over rumble strips. After awhile, the internal clutches in the trans will also fry due to inadequate friction modifier content.
I would think that the Police Interceptors transmissions WOULD need to be serviced at 30K, they have a TOUGH life...I know, I drive one every day. We put those cars though HE11! Imagine jumping in the car when it is -5 outside and it's been not running for 3 hours, (or 3 days on some occasions depending on the car) screaming out of the parking lot lights and siren and running full steam squealing tires around corners WOT, stop signs, constantly changing gears...you get the idea. This kind of thing happens daily for the average city police car. The average non police vehicle has maybe .1-.5% of it's life dedicated to WOT runs, while a police car may spend 5-10% on WOT runs.
#12
They were lucky and in the minority. Even the Police Interceptor's 4R70W, 4R75W, and 4R75E require 30,000 mile fluid service intervals. What happens after 100k miles of not changing the fluid is the friction modifiers break down and the torque converter lockup clutch gets fried. Whenever the TC has to lockup or be commanded to slip, your car will feel like it is running over rumble strips. After awhile, the internal clutches in the trans will also fry due to inadequate friction modifier content.
I would think that the Police Interceptors transmissions WOULD need to be serviced at 30K, they have a TOUGH life...I know, I drive one every day. We put those cars though HE11! Imagine jumping in the car when it is -5 outside and it's been not running for 3 hours, (or 3 days on some occasions depending on the car) screaming out of the parking lot lights and siren and running full steam squealing tires around corners WOT, stop signs, constantly changing gears...you get the idea. This kind of thing happens daily for the average city police car. The average non police vehicle has maybe .1-.5% of it's life dedicated to WOT runs, while a police car may spend 5-10% on WOT runs.
#14
Read the article in the Jan 06 issue of Modified Mustangs. They wrote a good piece on automatic trannies (part 1 of many to come). It should answer many of your questions. Probably wouldn't hurt for the manual guys to read also. Very informative and dispells many myths manual guys have about our trannies.
#16
Read the article in the Jan 06 issue of Modified Mustangs. They wrote a good piece on automatic trannies (part 1 of many to come). It should answer many of your questions. Probably wouldn't hurt for the manual guys to read also. Very informative and dispells many myths manual guys have about our trannies.
Ford claims the 4R70W in the E-250 (5.4 2V V8) doesn't need the torque converter drained since there is no plug. Instead, the service manual calls for dropping the pan every 30,000 miles. The reason behind this is to replenish the friction modifiers rather than change the ATF itself. I don't know the EXACT reasoning behind the "lifetime" fills for the newer 5/6-speed automatics, but there's a good chance Ford uses a synthetic ATF and assumes people will throw out their cars after 5 years.
#17