boosted launches with stock shafts

[senck243]

i recently went to the track and was launching at 5psi in 4wd. what is the most psi i can launch at without breaking shafts? i already have a billet flexplate input shaft and suncoast converter and valvebody. the trans has about 20k on it since being rebuilt with the suncoast extreme rebuild kit.

 

[-Boostjunky-]

Well, not saying it's safe to do, but I've launched with as much as 15 psi on stock intermediate/output shafts. My input shaft, flex plate, and converter are billet, but that's it.

I usually try to not go over 10 - 12 psi, though, since it doesn't seem to help my 60' times with the Toyo M/Ts that are on the truck. They just spin anything more than 12 psi.

 

[TheBigNasty]

If you want a guarantee go to wal mart. I've snapped a billet input with all other stock shafts so just go as far as you want. When it breaks it breaks.

 

[senck243]

Not looking for a guarantee... Looking for input from people that have experience launching their truck.

 

[huck25]

My stock shafts lasted well over a 100 15#+ boosted launches but all it takes is 1 and your done.

 

[senck243]

Thanks for the info looking for more like this

 

[TMONEYDIESEL]

Search, quit wasting our time with questions that have been answered before. Your shaft might break it might not. Depends on your power, how sticky the track, tires, lockup. Etc

 

[TheBigNasty]

Or the next day when you're cruising down the highway.

 

[mq105]

or the next day when you're cruising down the highway.

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