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Unread 06-05-2010, 07:10 PM   #1
drespecki
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TF 999 unknown fluid, what to add?

The TF999 in my 1991 'probably' has Dexron III in it but there is no way to tell. Can I change the filter and top it off with ATF+4 or should I use the new Dex/Merc fluid that states on the jug that it is the successor/newest update to the old Dexron III??

I have heard that one is backwards compatible with the other but the other is NOT and I don't know which way to go on this..

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Unread 06-05-2010, 07:49 PM   #2
imstillatwork
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when you have an unknown fluid in trans / xfer or radiator, drain and replace - don't top off.
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Unread 06-05-2010, 08:34 PM   #3
Burnerman
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I used +4 when I changed my filter the first time with unknown fluid and no issues. ATF+4 is compatable with 2 &3 fluids...
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Unread 06-05-2010, 08:42 PM   #4
drespecki
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It is? I thought it was DEX/MERC fluid that was compatible with most others....
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Unread 06-05-2010, 09:01 PM   #5
Burnerman
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I've read that +4 is designed to be backward compatabe with older fluids.>Chrysler transmission fluids: 7176, ATF+3, ATF+4
Here's one site. You cannot use anything other then +4 in a trans designed for +4.
Oh and this Quote from Here>http://www.allpar.com/fix/trans.html
Quote:
Is ATF+4 suitable for all Chrysler cars or just a few? (and Jeep exception)

This is from the Center for Quality Assurance site (as of July 24, 2008): “ATF+4® is approved for use in older transmissions and is currently utilized in newer Chrysler®, Jeep® and Dodge® vehicles. The previous MOPAR ATF+3® formulation was discontinued in 2005 and ATF+4® is recommended for all transmissions filled with ATF+3®.”
There is an important exception for Jeep owners. As Danny noted, "The Jeep AW-4 (Aisin-Warner) transmission should use Dexron III." Greg, a DCX tech, wrote that the AW4/AX4 transmission was used on 6-cylinder Jeep Cherokees through the end of production, and on the first six-cylinder 1993 Grand Cherokees
(built in 1992 and 1993), but on the Grand Cherokee it was phased out midway through the 1993 model year. This transmission requires Dexron, while the 42RE / A500SE which replaced the Aisin-Warner transmission midway in the 1993 model year needs ATF+4. Again, if you are confused, you may just want to try one of the new universal fluids that is both Dexron and ATF+4 compatible.
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Last edited by Burnerman; 06-05-2010 at 09:21 PM..
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Unread 06-05-2010, 09:04 PM   #6
drespecki
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That is the tough one....This trans was designed with Dexron II and then III in mind...
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Unread 06-06-2010, 06:16 AM   #7
I8AHUMR
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According to everything I've read, (manual, Haynes, etc) ATF+4 is the preferred. That's all I've ever used.
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Unread 06-06-2010, 11:23 AM   #8
drespecki
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I8AHUMMER, how can Dexron III required turn into ATF+4 ??? My 1991 asks for DEXRON III and the successor to that is DEX/MERC.... Arrrrgghhhh!!!! I cannot find the definitive answer..

Read this...
http://www.jeepsunlimited.com/forums...93#post4598493
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Unread 06-07-2010, 08:58 AM   #9
drespecki
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Here is some other stuff I found..Keep in mind mine is a 1991 pre-lockup tf999..




32RH History

In 1992, the TF999 received an electronic locking torque converter. This new arrangement was renamed the 32RH. The locking torque converter reduces operating temperatures, and increases fuel economy by eliminating slipping at higher speeds. The lower operating temperature prolongs the life of the transmission. The 32RH was used behind the 4.0L I-6 in the YJ, XJ, and TJ. The designation has a meaning behind it.

3 - number of speeds
2 - torque handling (2-300 ft-lbs)
R - rear wheel drive
H - hydraulically controlled

Specifications
Gear Ratio
1 2.74
2 1.54
3 1.00
R 2.20

Fluid Capacity: 8.55 quarts of ATF+4

Applications
Year Engine Model
'XX-'XX 4.0L I-6 XJ Cherokee
'92-'95 4.0L I-6 YJ Wrangler
'97-'02 4.0L I-6 TJ Wrangler
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Unread 06-07-2010, 09:02 AM   #10
drespecki
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And this...

All of the ATF+ fluids are specifically formulated for transmissions with lockup converters, they have friction modifiers to help prevent lockup clutch chatter.

As the OD transmissions were introduced, the ATF+ fluids were improved (+2, +3, +4) for better lubrication of the OD gears.

Dexron was the recommended fluid for non-lockup Torqueflites and is probably still the best choice for them; type F is perfectly OK to use in a non-lockup TF where it will make the shifts slightly firmer at the expense of some lubricating properties.
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Unread 06-07-2010, 09:47 AM   #11
Burnerman
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Are you doing a full fluid change? If it bugs you so much why not take it to a garage and have them flush and fill the trans. If something happens they'll have to make good. The shop that put Dexron in my 01 Grand and cooked the trans did. With my 89 TF999 I just added +4 to whatever was in the trans and it ran fine. Shifted smooth and the fluid still looks new 3 yrs later. Really I wouldn't sweat it. If the trans shifts fine now it should be fine after.
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Unread 06-07-2010, 10:02 AM   #12
drespecki
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I was just going to change the filter and the roughly 4 quarts I would lose when the animal (which fluid to add) reared its ugly head. ATF+4 is synthetic and thinner, Dexron III is not. (never add Dexron to any newer Chrysler trans as it is an older fluid in a newer type trans)

I don't think taking it to a shop is the answer because they might put in the wrong type. What I am trying to do is find out if I NEED to use Dexron III or its successor, Dex/Merc.
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Unread 12-30-2013, 10:17 PM   #13
Chrisnvegas
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I use Castrol Transmax +4
They said it was compatable with older Chrysler automatic transmissions.

Mine takes 3 3/4 quarts drained through a drain plug with no filter change. I think it's 4 quarts with a filter with another 4 quarts in the torque converter. Put in 3 quarts and start checking during refill to be safe.
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