ATF3 / Dexron III same?

[gtmud]

I have a 94 GC auto-overdrive full time 4x4. The book says to use dextron/ Mercron III type fluid. Can I used the ATF 3 type in its place, or do I need to use the D/M III?

[96greenbronco]

I only use EXACTLY what the manual calls for. I go to the Jeep dealer and get the Mopar stuff. I have read too many stories about buring up trannies, especially Chryslers.

[Cam7]

On Both of MY Jeeps The Factory Service Manuals say to use Dextron 111 or 7176. The Jeep Transmission Techs say that only use 7176, that dextron111 should have never been put in the Manuals. Stay with AtF 3 which is 7176.

[dksob81]

my Manual says ATF+3 or 7176 or equivalent.
and DexronIII/Mercon automatic transmission fluid for the transfer Case
but not for the transmission

[rjwolfram]

Originally Posted by gtmud

I have a 94 GC auto-overdrive full time 4x4. The book says to use dextron/ Mercron III type fluid. Can I used the ATF 3 type in its place, or do I need to use the D/M III?

See this link!

http://www.allpar.com/fix/trans.html

Haven't tried this yet, but intend to. My problem is not bumping down into 1st gear at stops. Works fine manually. I'm going to siphon the fluid out through the dip stick and replace with ATF3 and follow the following instructions.

"Often, people can cure their transmission problems simply by changing the fluid and retraining the computer! If you suspect (or know) they have put Dexron in, invest the $40 or so to have it replaced immediately - otherwise, you'll have a nice big transmission bill! [if you have a 1993-95 transmission, also follow TSB-18-24-95 and get your computer updated!"

[Master tech Chris Taurman wrote: "changing the fluid alone in 93-95 units is a short term fix; the TCM must also be flashed or replaced to prevent the fluid from becoming degraded again and to eliminate partial "EMCC" TCC operation which was the cause of 90% of TCC shudder complaints (NOT THE CONVERTER ITSELF!) as well as the aforementioned bump down (shift scheduling changes in the software took care of most of low mileage complaints).]

Hope this helps,
Bob

[gtmud]

TCM FLASHED? How is this done, can I do this at home or does it require diagnostic equipment? What is EMCC? Oh, thanks for the inputs, I did purchase the ATF+3, tonight I'm going to change it out. Is there anything else, while I have the pan down that i should look for?

[rjwolfram]

Originally Posted by gtmud

TCM FLASHED? How is this done, can I do this at home or does it require diagnostic equipment? What is EMCC? Oh, thanks for the inputs, I did purchase the ATF+3, tonight I'm going to change it out. Is there anything else, while I have the pan down that i should look for?

Sorry, I'm no expert. Read the info at the website I've shown. I think the TCM is your cars computer and flashed means reprogrammed with updated info. It also talks about rebooting the computer by pulling the battery cables for a few minutes and then "retraining" the computer by running the car through certain acceleration patterns. Read up and you'll know as much as I do.

Bob

[Cam7]

The TCM is the Transmission Control Module seperate from The PCM or ECM Engine Control Module. As far as the flashing the TCM This a Dealer `program only I have not seen any soft ware for Scan Tools to be able to do this.

[gtmud]

Ok, I did the filter/fluid change last night. One thing that has me conserned, there was ALLOT of metal shavings in the pan, the magnet was coated allot too. Is this a good indication that the tranny is on "barrowed time". I see that this tranny has the paper filter, so I'm thinking that at least the metal is staying out of the tranny and in the pan. It seemed to shift ok after the fluid change. The T-case however, the fluid looked like dark sludge, gray in color. I replaced it with mobile one synthetic. Any thing I need to be concerned about. thanks for all the other inputs. I am definately learning allot .

[rjwolfram]

Some information I found.

Some Chrysler transmissions, for example, can experience a "bump shift" condition. There’s nothing wrong with the transmission, but the computer needs to be reprogrammed to recalibrate the shift points. In Chrysler three-speed automatics, changing the fluid to ATF+3 can also help eliminate harsh shifts.

Some transmission problems may require "retraining" the computer. This is also necessary if an electronic transmission or computer has been replaced. Chrysler TSB 18-24-95 describes the retraining procedure that allows the computer to relearn the correct shift points.

Disconnect the battery to erase the computer’s memory.
Reconnect the battery and start the engine.
Drive he vehicle while trying to maintain a constant throttle position as it accelerates up through all four gears. If the transmission is shifting properly, it should be in 4th gear by the time you reach 45 to 50 mph. Repeat this procedure from a standing start 15 to 20 times.
With the vehicle traveling at less than 25 mph, do five to eight wide open throttle kickdowns to get the transmission to downshift to 1st from 2nd or 3rd gear. Drive in 2nd or 3rd gear for at least five seconds between kickdowns and remember to kick it down only when you’re going less than 25 mph.
While driving at 45 to 50 mph, do five to eight part to wide open throttle kickdowns to either 2nd or 3rd from 4th gear. Again, continue driving for at least five seconds in 4th gear between kickdowns.

Bob

[randy78]

well does this apply to the 95 4 speed autos ? 42RE ?

thanks

[rjwolfram]

From the information I quoted in Post #5 above, it appears it does. Don't know what 42re means.

Bob