Loading up the axle for quick acceleration

I expect the answer to my question is 'don't, it's pretty stupid' so how safe is it to load up the rear axle on the brakes and let it go? I tried it once where i took it to about 2500 revs and let the brake off. It felt great and seemed like a good way to get good acceleration. It also seemed like a good way to break something if i went higher with the revs

Is there a 'safe' limit or is it best avoided considering 50 year old components?

What about full throttle launches in general? I do like to the occasional launch when leaving junctions etc

It's a standard 1972 P6 3500 auto
 
Hi Jim,

You hit the nail on the head, it is best to avoid it. The torque converter stall speed will limit engine revs to circa 2250 provided the brakes hold the car from moving forward but in so doing generating substantial heat. Heat is one of the biggest enemies of an automatic transmission and holding the brakes on whilst raising engine revs will produce a substantial increase in transmission fluid temperature.

Ron.
 
Many decades ago when I was younger (and probably at the same level of silliness as now) I didn't even rev it on the brake, just floored the accelerator and was surprised at the lack of froward motion.
Fortunately it happened not too far from where I used to get the car serviced, so a short trip in a tow truck, a replacement axle and lots of dollars and she was back on the road again.
Now more gentle on the throttle!!
 
Twenty seconds is the absolute max for stalling the torque converter like that. Its actually part of the test routine but your supposed to rev to max (A few seconds) then stop and idle for twenty munutes to cool the oil down. A cooked converter requires a rebuild...If you really want accelleration then find a 2200 gearset of 3.54/1 (I've done it, it transforms the car)
 
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