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post #1 of 11 Old 05-04-2019, 11:30 AM Thread Starter
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Best Tranny fluid for 3 speed auto?

Got this STP ATF+4 for refill after new filter is installed. Is there a better fluid for our auto 3spd 413 transmissions?

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post #2 of 11 Old 05-05-2019, 09:35 AM
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Re: Best Tranny fluid for 3 speed auto?

All Chrysler Automatic Transmissions now use ATF+4.

If you are in a pinch standard Dexron can be used.
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post #3 of 11 Old 05-08-2019, 05:08 AM
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Re: Best Tranny fluid for 3 speed auto?

i am curious as to the possibility of using Type F in these trannies . works great in my 727's but never tried in the 413's
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post #4 of 11 Old 05-08-2019, 06:42 PM
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Re: Best Tranny fluid for 3 speed auto?

I use type F in all my 413's.

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post #5 of 11 Old 06-15-2019, 10:40 PM
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Re: Best Tranny fluid for 3 speed auto?

After some research from a tranny fluid manufacturer ATF + 4 is not as good as claimed. It didnt meet the original Chrysler spec. The advice I received was Use Dextron VI. This fluid is created to specs well above ATF+4.
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post #6 of 11 Old 06-17-2019, 06:02 AM
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Re: Best Tranny fluid for 3 speed auto?

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Originally Posted by Jason89 View Post
After some research from a tranny fluid manufacturer ATF + 4 is not as good as claimed. It didnt meet the original Chrysler spec. The advice I received was Use Dextron VI. This fluid is created to specs well above ATF+4.
After talking with an old Chrysler transmission guy years ago, he says anything other than ATF+3/ATF+4 will severely shorten your trans life. This means no "compatible" fluids, etc.

He also said thanks to the small fluid capacity, changing the fluid every 15-30k is your best bet if you want your trans to last.

Stop and think about it, the trans pan on these hold less fluid than your engine holds oil, what makes you think you can run 50-100k on trans fluid, but you have to change your oil every 3-10k?
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post #7 of 11 Old 06-23-2019, 05:48 PM
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Re: Best Tranny fluid for 3 speed auto?

+ fluids required in Chrysler non 3 speeds isn't better than any other fluid.

Its required as it maintains a steady viscosity over varying temperatures.

Constant viscosity is required due to the way the "computer" calculates fluid travel.

Another fluid could be fine at a given steady temperature but temperature varies.

Most fluids are thicker when cold and thinner when hot.

Type F is the "go to" fluid for non electronic trans if one desires a firm trans.

If one desires a soft or soggy trans use something other than type F

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post #8 of 11 Old 06-24-2019, 05:55 AM
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Re: Best Tranny fluid for 3 speed auto?

I followed the Type F advice once. 10k miles later I had to have my trans rebuilt.

There was zero noticeable shift tightening, just severely shortened trans life.
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post #9 of 11 Old 06-24-2019, 12:20 PM
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Re: Best Tranny fluid for 3 speed auto?

I can't dispute what you say as I wasn't there.

I will say there is no way Type F will shorten a 3 speed trans life.

Just the opposite, I've brought many soggy units back to satisfaction.

You may or may not have had other issues but you are the first to think so.

I'm a chronic experimenter and have had nothing but positive experience with type F.

Not just me, racers of many kinds agree positively with type F in 3 speeds.

Thanks
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Quote:
Originally Posted by 6g72 acclaim View Post
I followed the Type F advice once. 10k miles later I had to have my trans rebuilt.

There was zero noticeable shift tightening, just severely shortened trans life.
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post #10 of 11 Old 06-24-2019, 04:31 PM
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Re: Best Tranny fluid for 3 speed auto?

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Originally Posted by Glhs60 View Post
I can't dispute what you say as I wasn't there.

I will say there is no way Type F will shorten a 3 speed trans life.

Just the opposite, I've brought many soggy units back to satisfaction.

You may or may not have had other issues but you are the first to think so.

I'm a chronic experimenter and have had nothing but positive experience with type F.

Not just me, racers of many kinds agree positively with type F in 3 speeds.

Thanks
Randy
I've found just a simple fluid/filter change using ATF+4 does all those things.

I've also never had a Mopar trans fail me running ATF+4 and a quality filter.

No offense to you or the others who run it, but I'll take the advice of an old Mopar trans guy over a handful of guys who changed their fluid with good results. It's quite possible the results everyone is having are simply due to changing the fluid, not so much the type of fluid.
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post #11 of 11 Old 06-25-2019, 06:31 PM
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Re: Best Tranny fluid for 3 speed auto?

Quote:
Originally Posted by 6g72 acclaim View Post
I've found just a simple fluid/filter change using ATF+4 does all those things.

I've also never had a Mopar trans fail me running ATF+4 and a quality filter.

No offense to you or the others who run it, but I'll take the advice of an old Mopar trans guy over a handful of guys who changed their fluid with good results. It's quite possible the results everyone is having are simply due to changing the fluid, not so much the type of fluid.
DSM guys use farm and fleet hydraulic oil in their autos, has anyone experimented with that? Plenty of high-horsepower applications where its used and gives no issue whatsoever. That's all ATF is, dyed hydraulic fluid.
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