Posi Vs. Truetrac

[LeadFarmer]

So the time has come for a 12 bolt. I made one pass with the POS 10 bolt on drag radials and heard a loud ass pop, so that was enough for me, last thing I want is to tow this thing home.

Due to the fact that I do DD the car a little, plan to use it on road racing courses, and use it on the strip I've decided I should stick with a LSD and stay away from a locker/spool unit.

So I have 2 questions. 1: should I go with a posi or truetrac? I know the basic structural difference between the two (Posi uses clutch packs. Truetrac uses worm gears). From what I understand the Truetrac is more reliable and can handle more torque, but since I'll be road racing I also need a unit that'll behave under tight cornering conditions, so in that regard, do the two units have any differences?

Question 2: are the 33 spline axles overkill? From what I understand, the formula to calculate torque rating for the axles is as follows: 1st gear ratio X Ring and Pinion Ratio X Peak Torque X .9 (drive line loss). From what I hear, the 30 spline is rated 6200 lb-ft. So if I eventually work my way up to 450 RWTQ (ambitious, I know), with 4.10s, i'll be at 4416 lb-ft. So I should be fine with the 30 spline right? I don't wanna overkill and lose power on the dyno due to going with the 33 spline if they aren't necessary. (I go to dyno events and such).

[goof4080]

Subscribed as I am very hard on my toys and will probably be down this road sooner than I hope.