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Old 03-27-2013, 06:26 PM   #31
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ATF Never changed in 135K Miles - Leave or Change it?


There's an awful lot of BS in this thread as well as some good advice. How about following the procedure in the owner's manual which was developed by engineers who designed the transmission. Whether or not the transmission fluid needs changing depends on a lot of things. If it is full synthetic fluid, it may not need changing yet at 135,000 miles. The owner's manual maintenance schedule for my Lincoln Town Car recommends a fluid change at 150,000 miles. My Super Duty truck recommends fluid changes at 30,000 miles. It depends on the transmission and the type of fluid that it uses. The type of service, (driving conditions) , also effects the recommended change interval. Whether to flush or not also depends on the particular transmission. Please follow the manufacturer's recommendations for your vehicle. BTW, I have been rebuilding transmissions for more than forty years. I have NEVER seen one fail due to changing the transmission fluid.

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Old 03-27-2013, 07:57 PM   #32
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ATF Never changed in 135K Miles - Leave or Change it?


You will never get me to power flush a transmission. I would do an IV chase of new fluid using the engines power to pull the new fluid but no way will I ever use a machine flush on my vehicles. Just my opinion as I have had several instances of people I know having a power flush done on an engine and it having problems only weeks later, without exhibiting symptoms beforehand. I haven't rebuilt transmissions for 40 years but I've been around cars enough to know to avoid power flushes. There's too much chance of the pressure from the machines churning up some foreign material and it getting lodged into the countless veins within an automatic transmission.

To me service intervals all are subject to what expectations the owner has for the vehicle. I personally buy my vehicles with around 100k miles and drive them tip its not worth putting money into them. To me putting $100 of ATF fluid in every 40-50k miles makes good sense to me, I don't give a rip whether or not the manufacturer states it can go for 150k miles, most if their customers don't own the vehicle past that mileage anyways.

I dont disagree with most of what the previous poster said, I'm sure he has a wealth of knowledge doing it for 40 years, but there is no way I'm letting any cars ATF go 150k.

Like the previous poster said a lot of the need to change fluid depends on the driving, but for me I always err on the side of caution when dealing with a $3,000+ part.
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Old 03-27-2013, 09:05 PM   #33
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ATF Never changed in 135K Miles - Leave or Change it?


I can understand why you would feel that way. Changing the fluid more often than scheduled is certainly not going to hurt anything. I felt much the same way as you before I went to transmission school and learned how to rebuild automatic transmissions...a very many years ago. I was very slow to accept fully synthetic motor oil and transmission fluid. Over the years having worked on so many vehicles, rebuilding engines and transmissions, seeing the internals under so many different circumstances, and doing total restorations, I have come to appreciate the engineers who design these things. I often install "upgraded" parts and I sometimes change fluids early, but I respect the factory recommendations as well. I refuse to purchase a used vehicle from someone who has not serviced it properly.
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Old 03-28-2013, 12:53 PM   #34
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ATF Never changed in 135K Miles - Leave or Change it?


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Originally Posted by davido30093
There's an awful lot of BS in this thread as well as some good advice. How about following the procedure in the owner's manual which was developed by engineers who designed the transmission. Whether or not the transmission fluid needs changing depends on a lot of things. If it is full synthetic fluid, it may not need changing yet at 135,000 miles. The owner's manual maintenance schedule for my Lincoln Town Car recommends a fluid change at 150,000 miles. My Super Duty truck recommends fluid changes at 30,000 miles. It depends on the transmission and the type of fluid that it uses. The type of service, (driving conditions) , also effects the recommended change interval. Whether to flush or not also depends on the particular transmission. Please follow the manufacturer's recommendations for your vehicle. BTW, I have been rebuilding transmissions for more than forty years. I have NEVER seen one fail due to changing the transmission fluid.
I changed ATF in a 1999 chevy lumina my daughter uses to go to school. Bought from inlaws w/ 95000 miles on it. First 60,000 it was a sales rep can for 1st 2 years of life and the last 35,000 grannied by mother in law. Gm called for change at 100,000. I dropped pan and changed fluid at 96,000 plus wix filter and new fel pro pan gasket. My best friend (mechanic) and all the parts guys at advance auto frowned on it. They said tran would leak with new fluid cause dirt plugs the leaks. My daughter put 1,000 miles on it and it hasn't blown up yet. LOL Doesn't leak either. Used 6 quarts of castrol dexmerc and a 1/2 quart of lucas transmission additive( not a stop leak- they make that too).

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Old 03-28-2013, 02:10 PM   #35
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ATF Never changed in 135K Miles - Leave or Change it?


Way to go!! You can tell your friend and the guys at the parts store that I said you did the right thing....and at 69 years old, and probably more training and experience than all of that group combined, I am betting that you and I are right.
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Old 03-28-2013, 03:36 PM   #36
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ATF Never changed in 135K Miles - Leave or Change it?


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Way to go!! You can tell your friend and the guys at the parts store that I said you did the right thing....and at 69 years old, and probably more training and experience than all of that group combined, I am betting that you and I are right.
Thanks! I figured the $70 I spent was alot cheaper than a tranny rebuild. Fluid was red but oxidized a bit.We paid 1750 for car and I want 4 years out of it for both daughters to use for school. If tran went it would go to junkyard as spending big $$$ on old car worth $1750 doesn't make financial sense.

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Old 03-28-2013, 03:41 PM   #37
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ATF Never changed in 135K Miles - Leave or Change it?


You probably didn't really need the additive, but it shouldn't hurt it. As long as the fluid that you used meets the factory specs for that transmission, you should be good to go for a while.
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Old 03-28-2013, 04:08 PM   #38
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ATF Never changed in 135K Miles - Leave or Change it?


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You probably didn't really need the additive, but it shouldn't hurt it. As long as the fluid that you used meets the factory specs for that transmission, you should be good to go for a while.
Yeah wasn't sure about the lucas. I like lucas oil treatment for the 99 lumina and 99 Dakota r/t as it seems to slow oil leaks(probably cause the stuff is so thick it makes oil viscosity higher.).
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Old 03-29-2013, 02:48 AM   #39
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ATF Never changed in 135K Miles - Leave or Change it?


I also went to tranny school many years ago. The trannys from the 60's 70's and 80's really didn't need fluid changes as much as modern trannys. In many respects they were better. One of the worst through the years though, was the one in the Taurus/Sable. They were junk. Along with the Dodge/Chrysler minivan trannys.
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Old 03-29-2013, 06:44 AM   #40
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ATF Never changed in 135K Miles - Leave or Change it?


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I also went to tranny school many years ago. The trannys from the 60's 70's and 80's really didn't need fluid changes as much as modern trannys. In many respects they were better. One of the worst through the years though, was the one in the Taurus/Sable. They were junk. Along with the Dodge/Chrysler minivan trannys.
The transmissions of yesteryear to the best of my knowledge were alot bigger heavier and more robust than today's lightweight aluminum small transmissions. Everything automobiles is lightweight and not made as well as years ago. Gotta drop that weight to save in that gas.
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Old 04-25-2013, 04:21 AM   #41
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ATF Never changed in 135K Miles - Leave or Change it?


When I get a car or truck, usually around 100k miles, I drop the pan, change the filter and refill at the same time I also do plugs and oil change. After the next oil change, I have it flushed and every 30k afterwards.
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Old 04-25-2013, 09:29 AM   #42
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ATF Never changed in 135K Miles - Leave or Change it?


i've never had a tranny flush on any of my vehicles just ran 'em until they went out which was always well past the 100k mark, closer to the 200k mile mark. and again, this 7.3 diesel with a 4r100 went well over 300k and it wasn't a lack of flush that caused the failure, it was the addition of a 140 hp chip, broke the mechanical diode.
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Old 04-25-2013, 10:09 AM   #43
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ATF Never changed in 135K Miles - Leave or Change it?


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I have been rebuilding transmissions for more than forty years.
Not trying to hijack this thread, but just curious if you're familiar with a Buick Switch Pitch transmission? If so, what is your opinion on them? I have one in my car and had the hardest time finding someone to rebuild it a few years back. Not many people know what they are anymore.
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Old 04-25-2013, 11:59 AM   #44
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ATF Never changed in 135K Miles - Leave or Change it?


I have rebuilt a lot of GM transmissions, but I do not recall one by that name. Actually, I retired a few years ago and it may be one that I have not seen. Can you tell me the year and specific model of car that it came in?
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Old 04-25-2013, 01:07 PM   #45
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ATF Never changed in 135K Miles - Leave or Change it?


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I have rebuilt a lot of GM transmissions, but I do not recall one by that name. Actually, I retired a few years ago and it may be one that I have not seen. Can you tell me the year and specific model of car that it came in?
1966 Buick Riviera GS. It was also used in Oldsmobiles and Cadillacs during that time. '68 might have been the last year they used it, but I could be wrong.

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