Digger87xj
NAXJA Forum User
- Location
- Buffalo Creek/Lakewood CO
I am a Chysler/Jeep Tech and a Level 4 transmission tech.
Here is my take on Dex III and ATF +4 debate.
Both have vitually the same properties as far as lubrication goes.
ATF +4 has some added friction modifiers that Dex III does not and, can withstand much higher heat before break-down.
As far as using ATF+4 in a AW4 trans, Its just fine, there will be no harm in a normally working transmission. Those that have issues with ATF+4 usually had problems to begin with and were trying to fix a problem with a fluid change. They would have likely seen the same results using fresh DEX III.
If the AW4 has been recenty rebuilt, and/or has a new torque converter, then DEX III will be required during break-in of the torque converter clutch. The same applies for early Chrysler transmissions that used ATF+3. The friction modifiers in ATF+4 will cause early failure of the clutch material. Once the break-in is achived, use of ATF+4 is recommended for it's superior heat stability.
Run what you want. Just keep the trans cool and it will go for a very very long time.
Here is my take on Dex III and ATF +4 debate.
Both have vitually the same properties as far as lubrication goes.
ATF +4 has some added friction modifiers that Dex III does not and, can withstand much higher heat before break-down.
As far as using ATF+4 in a AW4 trans, Its just fine, there will be no harm in a normally working transmission. Those that have issues with ATF+4 usually had problems to begin with and were trying to fix a problem with a fluid change. They would have likely seen the same results using fresh DEX III.
If the AW4 has been recenty rebuilt, and/or has a new torque converter, then DEX III will be required during break-in of the torque converter clutch. The same applies for early Chrysler transmissions that used ATF+3. The friction modifiers in ATF+4 will cause early failure of the clutch material. Once the break-in is achived, use of ATF+4 is recommended for it's superior heat stability.
Run what you want. Just keep the trans cool and it will go for a very very long time.