Racing ATF oil in Nag1 ?

Hi

Anyone have tried a racing ATF in Nag 1 ?

Since I have add another 200 HP on the motor (Now at 700RWHP) I am starting to experience clutch
slippage mostly between 2/3 and 3/4 shift, not badly but noticeable as about twice the shift time.

I Have a Nag1 with Paramount Valve body, a big transmission cooler, and modified clutch pack (added clutch).


I have about 20,000 miles since the transmission rebuild, I was not planning to rebuild again the transmission.


Since ATF4 (what is recommended by Chrysler) is in the transmission actually and this oil have a lot of friction modifier in it, my theory was if I go Racing ATF without friction modifier, that I will stop the slippage since they claim 50% more grip on clutch pack.

I also have read that Racing oil in Chrysler transmission may create Shutter, inconstant shift or noise.

Not really sure what to do, If someone have experience Racing oil in Nag 1, that will secure my decision.

Keep in mind that this car is still my daily driver , I do not mind about hard shift but do not want slippage under WOT and no shutter in normal driving.

Thanks