What,s a good RPM to launch a 4 speed?

Mad Dart said

I would say use your line lock and load the diff by letting out the clutch a hair, wind it up and let it loose. Most breaks using a 4spd is caused by not preloading the drivetrain. This is a must to reduce the chances of something going boooommmmmm. Just a suggestion

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I do have line-loc and use it.My motor is 452 HP,which is why I broke the 8 1/4.Last year when I broke the cone-type s.g,it was a used,old one.It,s all good now.I have C.F dual frriction clutch,Lakewood s.sheild,d,shaft loop,4.10,s in clutch s.g.,adj. pinion snubber,Bears performance racing axels.I,m not trying to be the fastest,just having fun.After June 5-6 weekend,the car won,t be raced anymore,I have a 66 Dart for racing!