Re: ATF 4 versus Dextron III whats the difference?
[Re: mopowergtx]
#34234
02/03/07 09:51 PM
02/03/07 09:51 PM
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Anonymous
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Anonymous
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ALL I KNOW is that when you use the atf+4 or atf+3, your tranny looks like brand new, when dropping the pan, clutches are like new. dexron III is like old technology, good but not great
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Re: ATF 4 versus Dextron III whats the difference?
[Re: mopowergtx]
#34235
02/03/07 09:53 PM
02/03/07 09:53 PM
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Anonymous
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Anonymous
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Dont know exactly but most mopars for some time now have required atf+3 or atf+4 in both cases you can use valvoline maxlife atf in place and its much cheaper
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Re: ATF 4 versus Dextron III whats the difference?
[Re: mopowergtx]
#34240
02/03/07 11:23 PM
02/03/07 11:23 PM
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Anonymous
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ATF IV is a group III synthetic transmission fluid that Chrysler has developed and licensed. I believe it also has a friction modifier in addition to other additives. As far as I know, Valvoline is the only aftermarket manfacture of the ATF+IV.
I understand that you could use Dextron, but need to ad Lubeguard to make it work...I personally would stay away from this method.
I am using Redline ATF C+ spec for my new Chrysler transmissions...Redline is an Ester based group V ATF. On a side note: Redline is not licensed ATF+IV, but it is the best ATF in my opinion.
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Re: ATF 4 versus Dextron III whats the difference?
[Re: GO_Fish]
#34241
02/03/07 11:32 PM
02/03/07 11:32 PM
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Joined: Jan 2003
Posts: 3,122 Auburn WA
Dave_J
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master
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Posts: 3,122
Auburn WA
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What Go Fish said is true. While not a Ram, my 92 Plymouth Duster with the A-604 OD was due for a fluid change so I asked a few places to include the dealers parts man. All said Dexron III was ok to use. WRONG! WRONG! WRONG! $1500 later and I had a new trany. Go to Allpar.com and read some http://allpar.com/fix/trans.html befor you do a big boo boo. DaveJ
Retired, US ARMY 1973-1994 ASE mechanic, Electrical 1994-1997 Retired GTE/VERIZON/FRONTIER 1997-2015
Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.
03 Suzuki Burgman 650(Burger King) Scooter 65 Formula S Cuda 78 Little Red Express Truck 98 Buick Regal (wifes car)
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Re: ATF 4 versus Dextron III whats the difference?
[Re: gregsrt]
#34243
02/04/07 10:23 AM
02/04/07 10:23 AM
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Joined: Aug 2004
Posts: 425 Eastern Ontario
shaker340
mopar
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mopar
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Posts: 425
Eastern Ontario
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Very interesting discussion, and I agree that one should never use anything but ATF+4 in the newer transmissions. But I have been using ATF+4 in my A-727 for about three years now and haven't noticed anything different than using a Dextron fluid. I have never used type F either so I can't comment. So does anyone have any info on using ATF+4 on older transmissions good or bad??
Mike
2008 Challenger SRT8 1940 Chrysler Royal coupe
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Re: ATF 4 versus Dextron III whats the difference?
[Re: shaker340]
#34244
02/04/07 10:32 AM
02/04/07 10:32 AM
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Anonymous
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I would also like opinions and experience using the newer ATF+ in older 727's instead of the dexron III. I currently run dexron III, is there a better product that will improve life and or performace of the trans? Thanks
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Re: ATF 4 versus Dextron III whats the difference?
[Re: GO_Fish]
#34247
02/04/07 01:17 PM
02/04/07 01:17 PM
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Joined: Jan 2003
Posts: 74,937 U.S.S.A.
JohnRR
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I Win
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Quote:
Unless you want a smoked transmission and a very large repair bill, use exactly what is specified on the trans dipstick or a known exact equivilent. Fill the tranny with the wrong stuff and you will shortly be buying a new transmission.
sorry , i can't agree with this, i have a 2000 ram with a BOMBed Cummins and a 48RE , it has had nothing but dexron III in it since i starting turning up the HP , i changed out the +3 at about 39k and haven't looked back, truck has 189k on it.
i rebuilt the trans at about 89k , that was after i let someone else try out my new turbo , truck was puttting about 450HP to the rear wheels at the time , and i stupidly didn't go on the test drive . i drove it 40K miles with a slipping trans, if i did anything other than commute back and forth to work , and this was with dex 3 , only the front clutch pack was smoked .
i've got about 100k on it since the rebuild and its acting up a bit , but everything i see is pointing to the PCM or the TPS (going in and out of lockup as i can see the signal dropping out) , it's not the trans itself. the truck also has an overlap issue for the last 100k miles (i have 6 clutches in a 4 clutch drum with about .120 clearance and its not enough clearance ???), i use BW hi energy clutches and there is no signs of slipping with spirited driving on a non stock HP engine .
the +3 and +4 has additives partly because there is a surge issue with the lockup clutch , these fluids mask the issue, and also it helps the lockup clutch survive because chrysler has a poorly designed convertor, in diesels anyway and the RPM drop is about 400 rpm , the + fluid allows the lockup clutch to SLIP .
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Re: ATF 4 versus Dextron III whats the difference?
[Re: GO_Fish]
#34249
02/04/07 04:33 PM
02/04/07 04:33 PM
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Anonymous
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ATF +4 is a synthetic transmission fluid. as such, it is more thermally stable than ATF+3 or others. as mentioned, there is a TSB chrysler issued stating that it is safe to supersede from +3, the only models it mentioned not to do such was 99 and older minivans, as they would not be able to break in a new torque converter clutch if replacement was required. i use ATF+4 on all my vehicles, expensive, but worth it.
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Re: ATF 4 versus Dextron III whats the difference?
#34250
02/04/07 10:46 PM
02/04/07 10:46 PM
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Anonymous
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Anonymous
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I don't see a problem running synthetic atf in older Mopar transmissions. Been there done that. https://www.amsoil.com/news/atf_new_specs.aspx
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