4 speed transmition oil

66fs said
That's what I use. There is a lot of wear when you use auto trans fluid when compared to 90 wt gear oil.

my dad bought a 1970 challenger new in late '69 - it came with AFT - we rebuilt the tranny when it hit 112,000 miles ( hard miles ) and guess what went back in? ATF.

we didnt need any syncros, or gears either... so if the tranny has been taken care of the atf will not wear any more/ less then any other fluid.

I'd also use Jamie Passions formula - he would definately know what he is doing -

here is how the car was shifted it's whole life....

hell the car even towed a camper all over it's the 70's..