What is the difference between the chrysler tranny fluid atf+4 and mercron/dext3?

 

Not sure, but I'm running Mer/Dex in mine, along with some LubeGuard.

 

so you dont use the atf+3 that chrysler recomends?

Also off topic here...how in the hell do you get you truck to smoke like that. I have the same mods as you and mine is usually just a puff at take off.

 

Nope, I've been running the Merc/Dec without any problems. I caught on the the idea from Bill K. at DTT.

Without seeing your sig. You have a Mad ECM?

 

I just got back from the Mopar shop, went to get some liquid gold they call "limited slip additive" and I ask that question. The parts clerk said that it was a special formulation for 2000 and up trannys, that Mercon/Dextron 3 was OK for all up to 2000.
Why doesn't anyone make the ATF+4 if it has been in since 2000?

 

what is Bill's theory behind it?

No...I dont have the mad ecm..I just saw it in your sig

 

Chrysler held the patent and didn't license anyone else to make it.

I heard that just recently, they started allowing others to make it.
Hopefully the price comes down as a result.


phox

 

I don't know if there is a theory to be honest. I would hate to speak for him, but I think he recommends Mer/Dex to be used in his DTT trannys and to change the fluid every 10,000. Speaking from personal experience, since using Mer/Dex the trans does shift better. I don't have a temp gauge so I wouldn't be able to tell if it runs any cooler than with atf+3.

 

Thanks for the info.....I think I need a mad ecm that avatar looks awesome