Originally Posted by JohnRR
Originally Posted by 19swinger70


I have a new converter and rebuilt / race prepped 727, and i want to put good fluid in it for the season. I have run ATF+4 in the past, but not sure what to do now.


Is that the fluid the person that did the trans is recommending ? =4 is the last fluid I would run in a trans that doesn't have a lockup convertor that needs to slip when applying ... then again I didn't run it in my 2000 Cummins Ram which is what the factory wanted , but my trans builder did not.


I have just always run ATF+3 and ATF+4 in all of my Mopars since the 90's. My trans builder (Mr. Cope) said to run any ATF.

1970 340 swinger. sublime
1967 barracuda fastback BB
55 Plymouth Project